TY  - JOUR
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Sedmak, Aleksandar
AU  - Radović, Nenad
AU  - Međo, Bojan
AU  - Mrdak, Mihailo
AU  - Bajić, Darko
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6008
AB  - This paper deals with analysis and comparison of the equivalent plastic strain and temperature fields in the aluminium alloy 2024 T3 welded joint, with macro/microstructure appearance and hardness profile. In the alloys hardened by heat treatment, grain size and particle size of the precipitate are functions of equivalent plastic strain, strain rate and temperature. By analyzing the equivalent plastic strain fields and temperature fields it is possible, to some extent, to capture the effect of welding parameters and thermo-mechanical conditions on grain structure, and therefore hardness and strength in the welded joint. A coupled thermo-mechanical model is applied to study the material behaviour during the linear welding stage of friction stir welding (FSW). Three-dimensional finite element (FE) model has been created in ABAQUS/Explicit software using the Johnson-Cook material law. The values of thermo-mechanical quantities during the welding stage are obtained from the numerical model and shown as distributions across the joint. The obtained values of these quantities are related to the microstructure of the joint zones and hardness distribution, and this relation is discussed.
PB  - VINČA Institute of Nuclear Sciences
T2  - Thermal Science
T1  - Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure
EP  - 320
IS  - 1A
SP  - 311
VL  - 27
DO  - 10.2298/TSCI210216186V
ER  - 

@article{
author = "Veljić, Darko and Rakin, Marko and Sedmak, Aleksandar and Radović, Nenad and Međo, Bojan and Mrdak, Mihailo and Bajić, Darko",
year = "2023",
abstract = "This paper deals with analysis and comparison of the equivalent plastic strain and temperature fields in the aluminium alloy 2024 T3 welded joint, with macro/microstructure appearance and hardness profile. In the alloys hardened by heat treatment, grain size and particle size of the precipitate are functions of equivalent plastic strain, strain rate and temperature. By analyzing the equivalent plastic strain fields and temperature fields it is possible, to some extent, to capture the effect of welding parameters and thermo-mechanical conditions on grain structure, and therefore hardness and strength in the welded joint. A coupled thermo-mechanical model is applied to study the material behaviour during the linear welding stage of friction stir welding (FSW). Three-dimensional finite element (FE) model has been created in ABAQUS/Explicit software using the Johnson-Cook material law. The values of thermo-mechanical quantities during the welding stage are obtained from the numerical model and shown as distributions across the joint. The obtained values of these quantities are related to the microstructure of the joint zones and hardness distribution, and this relation is discussed.",
publisher = "VINČA Institute of Nuclear Sciences",
journal = "Thermal Science",
title = "Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure",
pages = "320-311",
number = "1A",
volume = "27",
doi = "10.2298/TSCI210216186V"
}

Veljić, D., Rakin, M., Sedmak, A., Radović, N., Međo, B., Mrdak, M.,& Bajić, D.. (2023). Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure. in Thermal Science
VINČA Institute of Nuclear Sciences., 27(1A), 311-320.
https://doi.org/10.2298/TSCI210216186V

Veljić D, Rakin M, Sedmak A, Radović N, Međo B, Mrdak M, Bajić D. Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure. in Thermal Science. 2023;27(1A):311-320.
doi:10.2298/TSCI210216186V .

Veljić, Darko, Rakin, Marko, Sedmak, Aleksandar, Radović, Nenad, Međo, Bojan, Mrdak, Mihailo, Bajić, Darko, "Influence of temperature and plastic deformation on AA2024 T3 friction stir welded joint microstructure" in Thermal Science, 27, no. 1A (2023):311-320,
https://doi.org/10.2298/TSCI210216186V . .

TY  - PAT
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Međo, Bojan
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6922
AB  - Prikazani pronalazak, modularni alat za zavarivanje trenjem mešanjem sa podesivom dužinom trna kao predmet pronalaska, odnosi se na konstrukciono rešenje alata za zavarivanje u čvrstom stanju legura obojenih metala. Alat se satoji od: tela (1) alata, trna (2) i steznog vijka (3). Gornji deo tela (1) alata služi za stezanje u mašini, a donji deo tela (1) alata poseduje bočni otvor (5) sa navojem za fiksiranje trna (2). Sa donje strane tela (1) alata se nalazi čelo (7) alata sa urezanom levom zavojnicom. Telo (1) alata ima otvor (4) celom dužinom za smeštaj trna (2). Trn (2) ima konusni vrh sa narezanim levim navojem. Moguće je podešavati dužinu trna (2), odnosno rastojanje od vrha trna (2) do čela (7) alata u zavisnosti od vrste spoja i debljine materijala koji se zavaruje. Stezni vijak (3) služi za fiksiranje trna (2) alata na željenu poziciju.
T2  - Zavod za intelektualnu svojinu
T1  - Modularni alat za zavarivanje trenjem mešanjem sa podesivom dužinom trna
IS  - MP-2023/0001
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6922
ER  - 

@misc{
author = "Veljić, Darko and Rakin, Marko and Međo, Bojan",
year = "2023",
abstract = "Prikazani pronalazak, modularni alat za zavarivanje trenjem mešanjem sa podesivom dužinom trna kao predmet pronalaska, odnosi se na konstrukciono rešenje alata za zavarivanje u čvrstom stanju legura obojenih metala. Alat se satoji od: tela (1) alata, trna (2) i steznog vijka (3). Gornji deo tela (1) alata služi za stezanje u mašini, a donji deo tela (1) alata poseduje bočni otvor (5) sa navojem za fiksiranje trna (2). Sa donje strane tela (1) alata se nalazi čelo (7) alata sa urezanom levom zavojnicom. Telo (1) alata ima otvor (4) celom dužinom za smeštaj trna (2). Trn (2) ima konusni vrh sa narezanim levim navojem. Moguće je podešavati dužinu trna (2), odnosno rastojanje od vrha trna (2) do čela (7) alata u zavisnosti od vrste spoja i debljine materijala koji se zavaruje. Stezni vijak (3) služi za fiksiranje trna (2) alata na željenu poziciju.",
journal = "Zavod za intelektualnu svojinu",
title = "Modularni alat za zavarivanje trenjem mešanjem sa podesivom dužinom trna",
number = "MP-2023/0001",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6922"
}

Veljić, D., Rakin, M.,& Međo, B.. (2023). Modularni alat za zavarivanje trenjem mešanjem sa podesivom dužinom trna. in Zavod za intelektualnu svojinu(MP-2023/0001).
https://hdl.handle.net/21.15107/rcub_technorep_6922

Veljić D, Rakin M, Međo B. Modularni alat za zavarivanje trenjem mešanjem sa podesivom dužinom trna. in Zavod za intelektualnu svojinu. 2023;(MP-2023/0001).
https://hdl.handle.net/21.15107/rcub_technorep_6922 .

Veljić, Darko, Rakin, Marko, Međo, Bojan, "Modularni alat za zavarivanje trenjem mešanjem sa podesivom dužinom trna" in Zavod za intelektualnu svojinu, no. MP-2023/0001 (2023),
https://hdl.handle.net/21.15107/rcub_technorep_6922 .

TY  - JOUR
AU  - Veljić, Darko M.
AU  - Rakin, Marko P.
AU  - Sedmak, Aleksandar S.
AU  - Radović, Nenad A.
AU  - Međo, Bojan I.
AU  - Mrdak, Mihailo R.
AU  - Bajić, Darko R.
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5152
AB  - The influence of friction stir welding parameters on thermo-mechanical behavior of the material during welding is analyzed. An aluminum alloy is considered (Al 2024 T351), and different rotating and welding speeds are applied. The finite element model consists of the working plate (Al alloy), backing plate and welding tool. The influence of the welding conditions on material behavior is taken into account the application of the Johnson-Cook material model. The rotation speed of the tool affects the results. If increased, it contributes to an increase of friction-generated heat intensity. The other component of the generated heat, which stems from the plastic deformation of the material, is negligibly changed. When the welding speed, i.e. tool translation speed, is increased, the intensity of friction-generated heat decreases, while the heat generation due to plastic deforming is becoming more pronounced. Summed, this leads to rather small change of the total generation. The changes of the heat generation influence both the temperature field and reaction force. Also, the inadequate selection of welding parameters resulted in occurrence of the defects (pores) in the model.
PB  - VINČA Institute of Nuclear Sciences
T2  - Thermal Science
T1  - Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters
EP  - 2134
IS  - 3A
SP  - 2125
VL  - 26
DO  - 10.2298/TSCI210216186V
ER  - 

@article{
author = "Veljić, Darko M. and Rakin, Marko P. and Sedmak, Aleksandar S. and Radović, Nenad A. and Međo, Bojan I. and Mrdak, Mihailo R. and Bajić, Darko R.",
year = "2022",
abstract = "The influence of friction stir welding parameters on thermo-mechanical behavior of the material during welding is analyzed. An aluminum alloy is considered (Al 2024 T351), and different rotating and welding speeds are applied. The finite element model consists of the working plate (Al alloy), backing plate and welding tool. The influence of the welding conditions on material behavior is taken into account the application of the Johnson-Cook material model. The rotation speed of the tool affects the results. If increased, it contributes to an increase of friction-generated heat intensity. The other component of the generated heat, which stems from the plastic deformation of the material, is negligibly changed. When the welding speed, i.e. tool translation speed, is increased, the intensity of friction-generated heat decreases, while the heat generation due to plastic deforming is becoming more pronounced. Summed, this leads to rather small change of the total generation. The changes of the heat generation influence both the temperature field and reaction force. Also, the inadequate selection of welding parameters resulted in occurrence of the defects (pores) in the model.",
publisher = "VINČA Institute of Nuclear Sciences",
journal = "Thermal Science",
title = "Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters",
pages = "2134-2125",
number = "3A",
volume = "26",
doi = "10.2298/TSCI210216186V"
}

Veljić, D. M., Rakin, M. P., Sedmak, A. S., Radović, N. A., Međo, B. I., Mrdak, M. R.,& Bajić, D. R.. (2022). Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters. in Thermal Science
VINČA Institute of Nuclear Sciences., 26(3A), 2125-2134.
https://doi.org/10.2298/TSCI210216186V

Veljić DM, Rakin MP, Sedmak AS, Radović NA, Međo BI, Mrdak MR, Bajić DR. Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters. in Thermal Science. 2022;26(3A):2125-2134.
doi:10.2298/TSCI210216186V .

Veljić, Darko M., Rakin, Marko P., Sedmak, Aleksandar S., Radović, Nenad A., Međo, Bojan I., Mrdak, Mihailo R., Bajić, Darko R., "Thermo-mechanical analysis of linear welding stage in friction stir welding Influence of Welding Parameters" in Thermal Science, 26, no. 3A (2022):2125-2134,
https://doi.org/10.2298/TSCI210216186V . .

TY  - PAT
AU  - Veljić, Darko
AU  - Bajić, Nikola
AU  - Rakin, Marko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6343
AB  - Prikazani pronalazak, alat od osam pari kalibrisanih valjaka za uzdužno kontinualno profilisanje uske čelične trake i formiranje punjene žice, se odnosi na konstrukciono rešenje alata za kalibraciju uske čelične trake i alata za formiranje punjene žice za izradu jezgra specijalne bazične elektrode za zavarivanje. To je alat koji poseduje 8 pari uzastopno postavljenih kalibrisanih valjaka, od kojih 5 pari kalibrisanih valjaka u kontinuitetu formira žleb duž uske čelične trake i 3 para kalibrisanih valjaka za zatvaranje u oblik cevi sa sučeonim podužnim spojem. Dobijena cev je prečnika 3,8mm i namenjena je za izradu punjene žice. Alat se ugrađuje na liniju za kalibraciju čelične trake i formiranje punjene žice. Dobijena punjena žica je namenjena za izradu jezgra specijalne bazične elektrode za zavarivanje čime se proširuje oblast tehnike u kome pronalazak ima značajnu primenu. Primena punjene žice za izradu jezgra elektrode omogućava kombinaciju rutilnog punjenja jezgra sa bazičnom oblogom elektrode, kao i mogućnost mikrolegiranja i legiranja metala šava preko jezgra elektrode.
T2  - Zavod za intelektualnu svojinu, sektor  za patente odeljenje za mašinstvo, elektrotehniku i opštu tehniku 990
T1  - Alat od osam pari kalibrisanih valljaka za uzdužno kontinualno profilisanje uske čelične trake i formiranje punjene žice
IS  - 021/13722-MP-2021/0085
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6343
ER  - 

@misc{
author = "Veljić, Darko and Bajić, Nikola and Rakin, Marko",
year = "2021",
abstract = "Prikazani pronalazak, alat od osam pari kalibrisanih valjaka za uzdužno kontinualno profilisanje uske čelične trake i formiranje punjene žice, se odnosi na konstrukciono rešenje alata za kalibraciju uske čelične trake i alata za formiranje punjene žice za izradu jezgra specijalne bazične elektrode za zavarivanje. To je alat koji poseduje 8 pari uzastopno postavljenih kalibrisanih valjaka, od kojih 5 pari kalibrisanih valjaka u kontinuitetu formira žleb duž uske čelične trake i 3 para kalibrisanih valjaka za zatvaranje u oblik cevi sa sučeonim podužnim spojem. Dobijena cev je prečnika 3,8mm i namenjena je za izradu punjene žice. Alat se ugrađuje na liniju za kalibraciju čelične trake i formiranje punjene žice. Dobijena punjena žica je namenjena za izradu jezgra specijalne bazične elektrode za zavarivanje čime se proširuje oblast tehnike u kome pronalazak ima značajnu primenu. Primena punjene žice za izradu jezgra elektrode omogućava kombinaciju rutilnog punjenja jezgra sa bazičnom oblogom elektrode, kao i mogućnost mikrolegiranja i legiranja metala šava preko jezgra elektrode.",
journal = "Zavod za intelektualnu svojinu, sektor  za patente odeljenje za mašinstvo, elektrotehniku i opštu tehniku 990",
title = "Alat od osam pari kalibrisanih valljaka za uzdužno kontinualno profilisanje uske čelične trake i formiranje punjene žice",
number = "021/13722-MP-2021/0085",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6343"
}

Veljić, D., Bajić, N.,& Rakin, M.. (2021). Alat od osam pari kalibrisanih valljaka za uzdužno kontinualno profilisanje uske čelične trake i formiranje punjene žice. in Zavod za intelektualnu svojinu, sektor  za patente odeljenje za mašinstvo, elektrotehniku i opštu tehniku 990(021/13722-MP-2021/0085).
https://hdl.handle.net/21.15107/rcub_technorep_6343

Veljić D, Bajić N, Rakin M. Alat od osam pari kalibrisanih valljaka za uzdužno kontinualno profilisanje uske čelične trake i formiranje punjene žice. in Zavod za intelektualnu svojinu, sektor  za patente odeljenje za mašinstvo, elektrotehniku i opštu tehniku 990. 2021;(021/13722-MP-2021/0085).
https://hdl.handle.net/21.15107/rcub_technorep_6343 .

Veljić, Darko, Bajić, Nikola, Rakin, Marko, "Alat od osam pari kalibrisanih valljaka za uzdužno kontinualno profilisanje uske čelične trake i formiranje punjene žice" in Zavod za intelektualnu svojinu, sektor  za patente odeljenje za mašinstvo, elektrotehniku i opštu tehniku 990, no. 021/13722-MP-2021/0085 (2021),
https://hdl.handle.net/21.15107/rcub_technorep_6343 .

TY  - CONF
AU  - Levchenko, Oleg
AU  - Bezushko, Olga
AU  - Maidanchuk, Taras
AU  - Lukianenko, Anna
AU  - Goncharova, Olga
AU  - Bajić, Darko
AU  - Veljić, Darko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6923
AB  - The results of investigations of chemical composition and emission rates of the welding 
fume, generated during welding using electrodes for copper alloys, are presented with the aim of 
improvement of their sanitary and hygienic characteristics. It is shown that in order to create new 
grades of welding electrodes with improved hygienic characteristics, it is necessary to have the 
data of the initial sanitary and hygienic evaluation in accordance with international standards. It 
was established that the use of binder based on pure lithium liquid glass in the coating of 
electrodes for welding copper alloys, increases the rate of welding fume emission into the air, as 
well as the content of manganese and copper oxides in it. The minimum rates of harmful 
emissions were recorded during the use of sodium-potassium binder, which is recommended for 
mass production of this type of electrodes.
PB  - EDP Sciences
C3  - E3S Web of Conferences
T1  - Effect of liquid glass type on hygienic characteristics of coated electrodes for arc welding of tin bronze
SP  - 09018
VL  - 280
DO  - 10.1051/e3sconf/202128009018
ER  - 

@conference{
author = "Levchenko, Oleg and Bezushko, Olga and Maidanchuk, Taras and Lukianenko, Anna and Goncharova, Olga and Bajić, Darko and Veljić, Darko",
year = "2021",
abstract = "The results of investigations of chemical composition and emission rates of the welding 
fume, generated during welding using electrodes for copper alloys, are presented with the aim of 
improvement of their sanitary and hygienic characteristics. It is shown that in order to create new 
grades of welding electrodes with improved hygienic characteristics, it is necessary to have the 
data of the initial sanitary and hygienic evaluation in accordance with international standards. It 
was established that the use of binder based on pure lithium liquid glass in the coating of 
electrodes for welding copper alloys, increases the rate of welding fume emission into the air, as 
well as the content of manganese and copper oxides in it. The minimum rates of harmful 
emissions were recorded during the use of sodium-potassium binder, which is recommended for 
mass production of this type of electrodes.",
publisher = "EDP Sciences",
journal = "E3S Web of Conferences",
title = "Effect of liquid glass type on hygienic characteristics of coated electrodes for arc welding of tin bronze",
pages = "09018",
volume = "280",
doi = "10.1051/e3sconf/202128009018"
}

Levchenko, O., Bezushko, O., Maidanchuk, T., Lukianenko, A., Goncharova, O., Bajić, D.,& Veljić, D.. (2021). Effect of liquid glass type on hygienic characteristics of coated electrodes for arc welding of tin bronze. in E3S Web of Conferences
EDP Sciences., 280, 09018.
https://doi.org/10.1051/e3sconf/202128009018

Levchenko O, Bezushko O, Maidanchuk T, Lukianenko A, Goncharova O, Bajić D, Veljić D. Effect of liquid glass type on hygienic characteristics of coated electrodes for arc welding of tin bronze. in E3S Web of Conferences. 2021;280:09018.
doi:10.1051/e3sconf/202128009018 .

Levchenko, Oleg, Bezushko, Olga, Maidanchuk, Taras, Lukianenko, Anna, Goncharova, Olga, Bajić, Darko, Veljić, Darko, "Effect of liquid glass type on hygienic characteristics of coated electrodes for arc welding of tin bronze" in E3S Web of Conferences, 280 (2021):09018,
https://doi.org/10.1051/e3sconf/202128009018 . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Bajic, Darko
AU  - Veljić, Darko
AU  - Rakin, Marko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4780
AB  - In this paper we will describe the process of the deposition of thick layers of VPS-Ti coating, which is used as a bonding layer for the upper porous Ti coatings on implant substrates. In order to deposit the powder, we used HoGANaS Ti powder labelled as AMPERIT 154.086-63 mu m. In order to test the mechanical properties and microstructure of the VPS-Ti coating, the powder was deposited on C 4171 (X15Cr13 EN10027) steel substrates. Mechanical tests of the microhardness of the coating were per-formed by the Vickers hardness test method (HV0.3) and tensile strength by measuring the force per unit area (MPa). The micro-hardness of the coating is 159 HV0.3, which is consistent with the microstructure. The coating was found to have a good bond strength of 68 MPa. The morphology of the powder particles was examined on a scanning electron microscope. The microstructure of the coating, both when deposited and etched, was examined with an optical microscope and a scanning elec-tron microscope. By etching the coating layers, it was found that the structure is homogeneous and that it consists of a mixture of low-temperature and high-temperature titanium phases (alpha-Ti + beta-Ti). Our tests have shown that the deposited layers of Ti coating can be used as a bonding layer for porous Ti coatings in the production of implants.
T2  - Materiali in Tehnologije
T1  - Characterisation of biomedical titanium layers deposited by a vacuum plasma spray process
EP  - 236
IS  - 2
SP  - 231
VL  - 55
DO  - 10.17222/mit.2020.135
ER  - 

@article{
author = "Mrdak, Mihailo and Bajic, Darko and Veljić, Darko and Rakin, Marko",
year = "2021",
abstract = "In this paper we will describe the process of the deposition of thick layers of VPS-Ti coating, which is used as a bonding layer for the upper porous Ti coatings on implant substrates. In order to deposit the powder, we used HoGANaS Ti powder labelled as AMPERIT 154.086-63 mu m. In order to test the mechanical properties and microstructure of the VPS-Ti coating, the powder was deposited on C 4171 (X15Cr13 EN10027) steel substrates. Mechanical tests of the microhardness of the coating were per-formed by the Vickers hardness test method (HV0.3) and tensile strength by measuring the force per unit area (MPa). The micro-hardness of the coating is 159 HV0.3, which is consistent with the microstructure. The coating was found to have a good bond strength of 68 MPa. The morphology of the powder particles was examined on a scanning electron microscope. The microstructure of the coating, both when deposited and etched, was examined with an optical microscope and a scanning elec-tron microscope. By etching the coating layers, it was found that the structure is homogeneous and that it consists of a mixture of low-temperature and high-temperature titanium phases (alpha-Ti + beta-Ti). Our tests have shown that the deposited layers of Ti coating can be used as a bonding layer for porous Ti coatings in the production of implants.",
journal = "Materiali in Tehnologije",
title = "Characterisation of biomedical titanium layers deposited by a vacuum plasma spray process",
pages = "236-231",
number = "2",
volume = "55",
doi = "10.17222/mit.2020.135"
}

Mrdak, M., Bajic, D., Veljić, D.,& Rakin, M.. (2021). Characterisation of biomedical titanium layers deposited by a vacuum plasma spray process. in Materiali in Tehnologije, 55(2), 231-236.
https://doi.org/10.17222/mit.2020.135

Mrdak M, Bajic D, Veljić D, Rakin M. Characterisation of biomedical titanium layers deposited by a vacuum plasma spray process. in Materiali in Tehnologije. 2021;55(2):231-236.
doi:10.17222/mit.2020.135 .

Mrdak, Mihailo, Bajic, Darko, Veljić, Darko, Rakin, Marko, "Characterisation of biomedical titanium layers deposited by a vacuum plasma spray process" in Materiali in Tehnologije, 55, no. 2 (2021):231-236,
https://doi.org/10.17222/mit.2020.135 . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Janaćković, Đorđe
AU  - Veljić, Darko
AU  - Bajić, Darko
PY  - 2021
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/6035
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5036
AB  - The aim of this study was to deposit multi-functional ZrO28%Y2O3 coating layers using the plasma spray technology and then to characterise such layers. In combination with other biomedical ceramics, this coating is intended for the application in implant surface modification. The examination was focused on the mechanical properties and microstructure layers. Using the atmospheric plasma spraying, duplex ZrO28%Y2O3/Ni22Cr10Al1Y coating system was deposited on the X15Cr13 stainless steel, with two different thicknesses of the bond and ceramic coatings. The microstructure was analysed using an optical microscope, including the assessment of the content of micropores. The morphology of powder particles and ceramic coating surfaces were examined on a scanning electron microscope (SEM). The quality of the ZrO28%Y2O3 layers makes them suitable for the application and combination with other materials to create a system of biomedical or multifunctional coatings.
AB  - Cilj ovog rada bio je da se deponuju višenamenski slojevi prevlake ZrO28%Y2O3 primenom plazma
sprej tehnologije, a zatim da se karakterišu takvi slojevi. U kombinaciji sa drugom biomedicinskom
keramikom, ova prevlaka je namenjena primeni u modifikaciji površine implantata. spitivanje je
bilo usredsređeno na mehanička svojstva i mikrostrukturu slojeva. orišćenjem atmosferskog
plazma spreja, dupleks sistem prevlaka ZrO28%Y2O3 / Ni22Cr10Al1 nanet je na nerđajući čelik
X15Cr13, sa dve različite debljine vezne i keramičke prevlake. ikrostruktura je analizirana
pomoću optičkog mikroskopa, uključujući procenu sadr aja mikro pora. orfologija čestica praha i
površina keramičkih prevlaka ispitivane su na skening elektronskom mikroskopu (SE ). valitet
slojeva ZrO28%Y2O3 čini ih pogodnim za nanošenje i kombinaciju sa drugim materijalima kako bi
se stvorio sistem biomedicinskih ili multifunkcionalnih prevlaka.
PB  - Inženjersko društvo za koroziju
T2  - Zaštita materijala
T1  - Characterisation of biocompatible layers of ZrO28%Y2O used in combination with other ceramics to modify the surface of implants
T1  - Karakterizacija biokompatibilnih slojeva ZrO28%Y2O3 koji se koriste u kombinaciji sa drugom keramikom za modifikaciju površine implantata
EP  - 268
IS  - 4
SP  - 262
VL  - 62
DO  - 10.5937/zasmat2104262M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Janaćković, Đorđe and Veljić, Darko and Bajić, Darko",
year = "2021",
abstract = "The aim of this study was to deposit multi-functional ZrO28%Y2O3 coating layers using the plasma spray technology and then to characterise such layers. In combination with other biomedical ceramics, this coating is intended for the application in implant surface modification. The examination was focused on the mechanical properties and microstructure layers. Using the atmospheric plasma spraying, duplex ZrO28%Y2O3/Ni22Cr10Al1Y coating system was deposited on the X15Cr13 stainless steel, with two different thicknesses of the bond and ceramic coatings. The microstructure was analysed using an optical microscope, including the assessment of the content of micropores. The morphology of powder particles and ceramic coating surfaces were examined on a scanning electron microscope (SEM). The quality of the ZrO28%Y2O3 layers makes them suitable for the application and combination with other materials to create a system of biomedical or multifunctional coatings., Cilj ovog rada bio je da se deponuju višenamenski slojevi prevlake ZrO28%Y2O3 primenom plazma
sprej tehnologije, a zatim da se karakterišu takvi slojevi. U kombinaciji sa drugom biomedicinskom
keramikom, ova prevlaka je namenjena primeni u modifikaciji površine implantata. spitivanje je
bilo usredsređeno na mehanička svojstva i mikrostrukturu slojeva. orišćenjem atmosferskog
plazma spreja, dupleks sistem prevlaka ZrO28%Y2O3 / Ni22Cr10Al1 nanet je na nerđajući čelik
X15Cr13, sa dve različite debljine vezne i keramičke prevlake. ikrostruktura je analizirana
pomoću optičkog mikroskopa, uključujući procenu sadr aja mikro pora. orfologija čestica praha i
površina keramičkih prevlaka ispitivane su na skening elektronskom mikroskopu (SE ). valitet
slojeva ZrO28%Y2O3 čini ih pogodnim za nanošenje i kombinaciju sa drugim materijalima kako bi
se stvorio sistem biomedicinskih ili multifunkcionalnih prevlaka.",
publisher = "Inženjersko društvo za koroziju",
journal = "Zaštita materijala",
title = "Characterisation of biocompatible layers of ZrO28%Y2O used in combination with other ceramics to modify the surface of implants, Karakterizacija biokompatibilnih slojeva ZrO28%Y2O3 koji se koriste u kombinaciji sa drugom keramikom za modifikaciju površine implantata",
pages = "268-262",
number = "4",
volume = "62",
doi = "10.5937/zasmat2104262M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Janaćković, Đ., Veljić, D.,& Bajić, D.. (2021). Characterisation of biocompatible layers of ZrO28%Y2O used in combination with other ceramics to modify the surface of implants. in Zaštita materijala
Inženjersko društvo za koroziju., 62(4), 262-268.
https://doi.org/10.5937/zasmat2104262M

Mrdak M, Lačnjevac Č, Rakin M, Janaćković Đ, Veljić D, Bajić D. Characterisation of biocompatible layers of ZrO28%Y2O used in combination with other ceramics to modify the surface of implants. in Zaštita materijala. 2021;62(4):262-268.
doi:10.5937/zasmat2104262M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Janaćković, Đorđe, Veljić, Darko, Bajić, Darko, "Characterisation of biocompatible layers of ZrO28%Y2O used in combination with other ceramics to modify the surface of implants" in Zaštita materijala, 62, no. 4 (2021):262-268,
https://doi.org/10.5937/zasmat2104262M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Janaćković, Đorđe
AU  - Veljić, Darko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5118
AB  - In this paper, studied was the melting of W powder particles in plasma, their behavior at oxidation as well as the mechanism of hardening on the surface of the substrate. Tungsten coating layers were deposited with vacuum plasma spray technology (VPS) on the test specimens of steel Č.4171 (X15Cr13 EN10027). VPS technology has advantages over the APS technology due to decreased oxidation of melted powder particles, by producing a coating with a controlled proportion of micro pores and greater uniformity of the deposited layers. Evaluation of mechanical characteristics of the layers was done by examining the microhardness using the HV0.3 method and tensile bond strength by tensile testing. The microstructures of the deposited layers were analyzed by means of optical microscopy (OM) and scanning electron microscopy (SEM). The results obtained showed that the tungsten coating consisted of well melted particles that interconnected and were overlapping, which shows a typical lamellar microstructure. Present in the microstructure are micro pores in very small proportion at the inter-lamellar boundaries. Tests have shown that layers of W coating deposited by plasma spray in inert gas shielding at low pressure have good mechanical properties and microstructure, which in the fully enables its use in exploitation.
AB  - U ovom radu proučavano je topljenje čestica praha W u plazmi, njihovo ponašanje na oksidaciju
kao i mehanizam očvršćavanja na površini substrata. Slojevi volfram prevlake su deponovani sa
vakuum plazma sprej tehnologijom (VPS) na ispitnim uzorcima od čelika Č.4171 (X15Cr13
EN10027). VPS tehnologija ima prednosti u odnosu na APS tehnologiju zbog smanjene oksidacije
istopljenih čestica praha, proizvodeći prevlaku sa kontrolisanim udelom mikro pora i većom
uniformnosti deponovanih slojeva. Procena mehaničkih karakteristika slojeva je urađena
ispitivanjem mikrotvrdoće metodom HV0.3 i zatezne čvrstoće spoja ispitivanjem na zatezanje.
Analizirane su mikrostrukture deponovanih slojeva pomoću optičke mikroskopije (OM) i skening
elektronske mikroskopije (SEM). Dobijeni rezultati su pokazali da se volfram prevlaka sastojala od
dobro istopljenih čestica međusobno povezanih i preklopljenih, koja pokazuje tipičnu lamelarnu
mikrostrukturu. U mikrostrukturi su prisutne mikro pore u veoma malom udelu koje se nalaze na
među-lamelarnim granicama. Ispitivanja su pokazala da slojevi W prevlake deponovani plazma
sprejom u zaštritnoj atmosferi inertnog gasa na niskom pritisku imaju dobre mehaničke osobine i
mikrostrukturu, koje u potpunosti omogućavaju njenu primenu u eksploataciji.
PB  - Inženjersko društvo za koroziju
T2  - Zaštita materijala
T1  - Characterization of vacuum plasma spray VPS - W coating
deposited on stainless steel substrates
T1  - Karakterizacija vakuum plazma sprej VPS - W prevlake deponovane na čeličnim podloga
EP  - 112
IS  - 2
SP  - 106
VL  - 62
DO  - 10.5937/zasmat2102106M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Janaćković, Đorđe and Veljić, Darko",
year = "2021",
abstract = "In this paper, studied was the melting of W powder particles in plasma, their behavior at oxidation as well as the mechanism of hardening on the surface of the substrate. Tungsten coating layers were deposited with vacuum plasma spray technology (VPS) on the test specimens of steel Č.4171 (X15Cr13 EN10027). VPS technology has advantages over the APS technology due to decreased oxidation of melted powder particles, by producing a coating with a controlled proportion of micro pores and greater uniformity of the deposited layers. Evaluation of mechanical characteristics of the layers was done by examining the microhardness using the HV0.3 method and tensile bond strength by tensile testing. The microstructures of the deposited layers were analyzed by means of optical microscopy (OM) and scanning electron microscopy (SEM). The results obtained showed that the tungsten coating consisted of well melted particles that interconnected and were overlapping, which shows a typical lamellar microstructure. Present in the microstructure are micro pores in very small proportion at the inter-lamellar boundaries. Tests have shown that layers of W coating deposited by plasma spray in inert gas shielding at low pressure have good mechanical properties and microstructure, which in the fully enables its use in exploitation., U ovom radu proučavano je topljenje čestica praha W u plazmi, njihovo ponašanje na oksidaciju
kao i mehanizam očvršćavanja na površini substrata. Slojevi volfram prevlake su deponovani sa
vakuum plazma sprej tehnologijom (VPS) na ispitnim uzorcima od čelika Č.4171 (X15Cr13
EN10027). VPS tehnologija ima prednosti u odnosu na APS tehnologiju zbog smanjene oksidacije
istopljenih čestica praha, proizvodeći prevlaku sa kontrolisanim udelom mikro pora i većom
uniformnosti deponovanih slojeva. Procena mehaničkih karakteristika slojeva je urađena
ispitivanjem mikrotvrdoće metodom HV0.3 i zatezne čvrstoće spoja ispitivanjem na zatezanje.
Analizirane su mikrostrukture deponovanih slojeva pomoću optičke mikroskopije (OM) i skening
elektronske mikroskopije (SEM). Dobijeni rezultati su pokazali da se volfram prevlaka sastojala od
dobro istopljenih čestica međusobno povezanih i preklopljenih, koja pokazuje tipičnu lamelarnu
mikrostrukturu. U mikrostrukturi su prisutne mikro pore u veoma malom udelu koje se nalaze na
među-lamelarnim granicama. Ispitivanja su pokazala da slojevi W prevlake deponovani plazma
sprejom u zaštritnoj atmosferi inertnog gasa na niskom pritisku imaju dobre mehaničke osobine i
mikrostrukturu, koje u potpunosti omogućavaju njenu primenu u eksploataciji.",
publisher = "Inženjersko društvo za koroziju",
journal = "Zaštita materijala",
title = "Characterization of vacuum plasma spray VPS - W coating
deposited on stainless steel substrates, Karakterizacija vakuum plazma sprej VPS - W prevlake deponovane na čeličnim podloga",
pages = "112-106",
number = "2",
volume = "62",
doi = "10.5937/zasmat2102106M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Janaćković, Đ.,& Veljić, D.. (2021). Characterization of vacuum plasma spray VPS - W coating
deposited on stainless steel substrates. in Zaštita materijala
Inženjersko društvo za koroziju., 62(2), 106-112.
https://doi.org/10.5937/zasmat2102106M

Mrdak M, Lačnjevac Č, Rakin M, Janaćković Đ, Veljić D. Characterization of vacuum plasma spray VPS - W coating
deposited on stainless steel substrates. in Zaštita materijala. 2021;62(2):106-112.
doi:10.5937/zasmat2102106M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Janaćković, Đorđe, Veljić, Darko, "Characterization of vacuum plasma spray VPS - W coating
deposited on stainless steel substrates" in Zaštita materijala, 62, no. 2 (2021):106-112,
https://doi.org/10.5937/zasmat2102106M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Janaćković, Đorđe
AU  - Veljić, Darko
AU  - Bajić, Darko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5119
AB  - In this paper, analyzed are the effects of the plasma spray distance on the microstructure and mechanical properties of the NiCrAlCoY2O3 coating layers deposited at atmospheric pressure. The microstructure and mechanical properties of the coating layers are under the influence of the interaction of plasma particles (ions and electrons) with powder particles, providing the transfer of velocity and temperature of the plasma particles onto the powder particles. The effect of the interaction is directly dependent on the time the powder particles were present in the plasma which is defined by distance of the plasma gun from the substrate, depending on the granulation of the powder, the melting point and specific gravity. In order to obtain homogeneous and denser coating layers with high adhesion, in the experiment three distances from the substrate were used: 95 mm, 105 mm and 115 mm. The layers were deposited on thin sheets of AlMg1 aluminum thickness of 0.6 mm. Evaluation of mechanical properties of the layers was carried out by examining microhardness using the HV0.1 method and the bond strength by tensile testing. The morphology of the powder particles was examined on the SEM, while the microstructure of the layers was evaluated under a light microscope in accordance with the Pratt Whitney standard. The results of the experiment showed that the distance from the substrate substantially influenced the structure and mechanical properties of the coating layers. The best deposited layers were examined in the system with the ZrO224%MgO ceramic coating, which have proved to be reliable protectionfrom high temperature and abrasive rocket jet fuel.
PB  - Engineers Society for Corrosion
T2  - Materials Protection
T1  - [Characterization of deposited plasma spray nicralcoy2o3 coating layers on almg1 alloy substrates] [Karakterizacija deponovanih slojeva plazma sprej prevlake nicralcoy2o3 na podlogama od legure almg1]
EP  - 40
IS  - 1
SP  - 34
VL  - 2021
DO  - 10.5937/zasmat2101034M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Janaćković, Đorđe and Veljić, Darko and Bajić, Darko",
year = "2021",
abstract = "In this paper, analyzed are the effects of the plasma spray distance on the microstructure and mechanical properties of the NiCrAlCoY2O3 coating layers deposited at atmospheric pressure. The microstructure and mechanical properties of the coating layers are under the influence of the interaction of plasma particles (ions and electrons) with powder particles, providing the transfer of velocity and temperature of the plasma particles onto the powder particles. The effect of the interaction is directly dependent on the time the powder particles were present in the plasma which is defined by distance of the plasma gun from the substrate, depending on the granulation of the powder, the melting point and specific gravity. In order to obtain homogeneous and denser coating layers with high adhesion, in the experiment three distances from the substrate were used: 95 mm, 105 mm and 115 mm. The layers were deposited on thin sheets of AlMg1 aluminum thickness of 0.6 mm. Evaluation of mechanical properties of the layers was carried out by examining microhardness using the HV0.1 method and the bond strength by tensile testing. The morphology of the powder particles was examined on the SEM, while the microstructure of the layers was evaluated under a light microscope in accordance with the Pratt Whitney standard. The results of the experiment showed that the distance from the substrate substantially influenced the structure and mechanical properties of the coating layers. The best deposited layers were examined in the system with the ZrO224%MgO ceramic coating, which have proved to be reliable protectionfrom high temperature and abrasive rocket jet fuel.",
publisher = "Engineers Society for Corrosion",
journal = "Materials Protection",
title = "[Characterization of deposited plasma spray nicralcoy2o3 coating layers on almg1 alloy substrates] [Karakterizacija deponovanih slojeva plazma sprej prevlake nicralcoy2o3 na podlogama od legure almg1]",
pages = "40-34",
number = "1",
volume = "2021",
doi = "10.5937/zasmat2101034M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Janaćković, Đ., Veljić, D.,& Bajić, D.. (2021). [Characterization of deposited plasma spray nicralcoy2o3 coating layers on almg1 alloy substrates] [Karakterizacija deponovanih slojeva plazma sprej prevlake nicralcoy2o3 na podlogama od legure almg1]. in Materials Protection
Engineers Society for Corrosion., 2021(1), 34-40.
https://doi.org/10.5937/zasmat2101034M

Mrdak M, Lačnjevac Č, Rakin M, Janaćković Đ, Veljić D, Bajić D. [Characterization of deposited plasma spray nicralcoy2o3 coating layers on almg1 alloy substrates] [Karakterizacija deponovanih slojeva plazma sprej prevlake nicralcoy2o3 na podlogama od legure almg1]. in Materials Protection. 2021;2021(1):34-40.
doi:10.5937/zasmat2101034M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Janaćković, Đorđe, Veljić, Darko, Bajić, Darko, "[Characterization of deposited plasma spray nicralcoy2o3 coating layers on almg1 alloy substrates] [Karakterizacija deponovanih slojeva plazma sprej prevlake nicralcoy2o3 na podlogama od legure almg1]" in Materials Protection, 2021, no. 1 (2021):34-40,
https://doi.org/10.5937/zasmat2101034M . .

TY  - JOUR
AU  - Bajić, Darko
AU  - Mrdak, Mihailo
AU  - Bajić, Nikola
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Radosavljević, Zoran
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4534
AB  - In this paper, we will present our investigation of the quality of J55 microalloyed steel welds that were formed by a basic flux-cored wire electrodes that were of appropriate quality and alloyed with Ni and Mo. Based on the comparison and analysis of the obtained results related to the testing of the chemical composition, mechanical properties, toughness at test temperatures, and the microstructure of welding joints formed by a classic and specially coated rutile flux-cored electrode, we assessed the justification to switch from solid wire electrodes to flux-cored alloyed wire electrodes of appropriate quality. The research aim for the application of flux-cored wire electrodes instead of solid wire electrodes is based on the advantages pertaining to a flux-cored wire: molten metal from electrode wire is transferred in the form of fine droplets, easy welding and maximum productivity within all spatial positions related to welding, improved properties of welding joints, and increased productivity when compared to a classic solid wire. Our research encompasses the development of the experimental production at the Research and Development Center IHIS Belgrade (Development Institute for Chemical Power Sources), Serbia, of the new type of a coated electrode with improved welding properties when compared to a classic electrode intended for microalloyed steel welding.
PB  - MDPI, Basel
T2  - Materials
T1  - Development of Coated Electrodes with Solid Wire and Flux-Cored Alloyed Wire for Microalloyed Steel Welding
IS  - 9
VL  - 13
DO  - 10.3390/ma13092152
ER  - 

@article{
author = "Bajić, Darko and Mrdak, Mihailo and Bajić, Nikola and Veljić, Darko and Rakin, Marko and Radosavljević, Zoran",
year = "2020",
abstract = "In this paper, we will present our investigation of the quality of J55 microalloyed steel welds that were formed by a basic flux-cored wire electrodes that were of appropriate quality and alloyed with Ni and Mo. Based on the comparison and analysis of the obtained results related to the testing of the chemical composition, mechanical properties, toughness at test temperatures, and the microstructure of welding joints formed by a classic and specially coated rutile flux-cored electrode, we assessed the justification to switch from solid wire electrodes to flux-cored alloyed wire electrodes of appropriate quality. The research aim for the application of flux-cored wire electrodes instead of solid wire electrodes is based on the advantages pertaining to a flux-cored wire: molten metal from electrode wire is transferred in the form of fine droplets, easy welding and maximum productivity within all spatial positions related to welding, improved properties of welding joints, and increased productivity when compared to a classic solid wire. Our research encompasses the development of the experimental production at the Research and Development Center IHIS Belgrade (Development Institute for Chemical Power Sources), Serbia, of the new type of a coated electrode with improved welding properties when compared to a classic electrode intended for microalloyed steel welding.",
publisher = "MDPI, Basel",
journal = "Materials",
title = "Development of Coated Electrodes with Solid Wire and Flux-Cored Alloyed Wire for Microalloyed Steel Welding",
number = "9",
volume = "13",
doi = "10.3390/ma13092152"
}

Bajić, D., Mrdak, M., Bajić, N., Veljić, D., Rakin, M.,& Radosavljević, Z.. (2020). Development of Coated Electrodes with Solid Wire and Flux-Cored Alloyed Wire for Microalloyed Steel Welding. in Materials
MDPI, Basel., 13(9).
https://doi.org/10.3390/ma13092152

Bajić D, Mrdak M, Bajić N, Veljić D, Rakin M, Radosavljević Z. Development of Coated Electrodes with Solid Wire and Flux-Cored Alloyed Wire for Microalloyed Steel Welding. in Materials. 2020;13(9).
doi:10.3390/ma13092152 .

Bajić, Darko, Mrdak, Mihailo, Bajić, Nikola, Veljić, Darko, Rakin, Marko, Radosavljević, Zoran, "Development of Coated Electrodes with Solid Wire and Flux-Cored Alloyed Wire for Microalloyed Steel Welding" in Materials, 13, no. 9 (2020),
https://doi.org/10.3390/ma13092152 . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Janaćković, Đorđe
AU  - Veljić, Darko
AU  - Bajić, Darko
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4552
AB  - The topography of the surface of the deposited VPS-Ti coatings on substrate surfaces of implants relating to the roughness and porous structure plays a decisive role in the process of on growth of the implants to the bones i.e.osseointegration. Direct bone on growth has been successfully achieved by using micro rough coating surfaces, such as the use of vacuum plasma spraying VPS-Ti coatings. The aim of this study was to make a comprehensive review of the characterization of porous VPS-Ti coatings deposited on substrates of titanium alloy that will find application in orthopedics.One of the preferred features of the VPS process is the ability to achieve optimum macro and micro structure of the surface of implants by optimizing the spray parameters of the powder deposition and by the range of the powder granulation. In order to achieve an optimum surface roughness, open porosity and structure of VPS-Ti coatings conducted was the optimization of deposition of powder with a change in plasma current and powder carrier gas flow rate of (700 A, 35 l/min and 800A, 20 l/min). Lower intensity plasma current with a greater flow of powder heats and melts the powder particles less forming micro pores of a larger size and a higher proportion of open pores and vice versa higher plasma currents and reduced flow provide better melted particles forming a smaller share of micro pores and open porosity in the deposited layers. Image analysis showed that by optimization of parameters in the coatings open porosity can be formed ranging from 45% to 57%. By examining the properties of the deposited layers it was determined that the most optimal roughness and share of open pores for osseointegration have the Ti layers which have been deposited with the lowest amperage and highest flow of powder carrier gas.
AB  - Topografija površine deponovanih VPS-Ti prevlaka na podlogama implanata koja se odnosi na hrapavost i poroznu strukturu imaju odlučujuću ulogu u procesu srastanja implanata sa kostima odnosno osteointegraciju Direktno urastanje kostiju uspešno se posti e korišćenjem mikro grubih površina prevlaka, kao što je primena vakuum plazma sprej VPS - Ti prevlake. Cilj ovog rada je bio da se napravi sveobuhvatan pregled karakterizacija VPS-Ti poroznih prevlaka deponovanih na podlogama od legure titana koje će naći aplikaciju u ortopediji. Jedna od povoljnih osobina VPS procesa je mogućnost postizanja optimalne makro i mikro strukture površine implanata optimizacijom sprej parametara depozicije praha i rasponom granulacije praha. U cilju postizanja optimalne hrapavosti, otvorene poroznosti i strukture VPS-Ti prevlaka sprovedena je optimizacija depozicije praha sa promenom plazma struje i protokom nosećeg gasa praha (700 A, 35 l/min i 800A, 20 l/min) Ni a jačina plazma struje uz veći protok praha slabije progreva i topi čestice praha obrazujući mikro pore veće veličine i veći udeo otvorenih pora i obrnuto veća plazma struja i manji protok omogućuju bolje topljenje čestica uz formiranje manjeg udela mikro pora i otvorene poroznosti u deponovanim slojevima. Analizom slika ustanovljeno je da se sa optimizacijom parametara u prevlakama mo e formirati otvorena poroznost sa rasponom od 45% do 57% Ispitivanjem karakteristika deponovanih slojeva ustanovljeno je da najoptimalniju hrapavost i udeo otvorenih pora za osteointegraciju imaju slojevi Ti deponovani sa najni om ampera om i najvećim protokom nosećeg gasa praha.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration
T1  - Mehanička i mikrostrukturna svojstva VPS-Ti porozne prevlake deponovane na podlogama od legure titana za osteointegraciju
EP  - 59
IS  - 1
SP  - 52
VL  - 61
DO  - 10.5937/zasmat2001052M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Janaćković, Đorđe and Veljić, Darko and Bajić, Darko",
year = "2020",
abstract = "The topography of the surface of the deposited VPS-Ti coatings on substrate surfaces of implants relating to the roughness and porous structure plays a decisive role in the process of on growth of the implants to the bones i.e.osseointegration. Direct bone on growth has been successfully achieved by using micro rough coating surfaces, such as the use of vacuum plasma spraying VPS-Ti coatings. The aim of this study was to make a comprehensive review of the characterization of porous VPS-Ti coatings deposited on substrates of titanium alloy that will find application in orthopedics.One of the preferred features of the VPS process is the ability to achieve optimum macro and micro structure of the surface of implants by optimizing the spray parameters of the powder deposition and by the range of the powder granulation. In order to achieve an optimum surface roughness, open porosity and structure of VPS-Ti coatings conducted was the optimization of deposition of powder with a change in plasma current and powder carrier gas flow rate of (700 A, 35 l/min and 800A, 20 l/min). Lower intensity plasma current with a greater flow of powder heats and melts the powder particles less forming micro pores of a larger size and a higher proportion of open pores and vice versa higher plasma currents and reduced flow provide better melted particles forming a smaller share of micro pores and open porosity in the deposited layers. Image analysis showed that by optimization of parameters in the coatings open porosity can be formed ranging from 45% to 57%. By examining the properties of the deposited layers it was determined that the most optimal roughness and share of open pores for osseointegration have the Ti layers which have been deposited with the lowest amperage and highest flow of powder carrier gas., Topografija površine deponovanih VPS-Ti prevlaka na podlogama implanata koja se odnosi na hrapavost i poroznu strukturu imaju odlučujuću ulogu u procesu srastanja implanata sa kostima odnosno osteointegraciju Direktno urastanje kostiju uspešno se posti e korišćenjem mikro grubih površina prevlaka, kao što je primena vakuum plazma sprej VPS - Ti prevlake. Cilj ovog rada je bio da se napravi sveobuhvatan pregled karakterizacija VPS-Ti poroznih prevlaka deponovanih na podlogama od legure titana koje će naći aplikaciju u ortopediji. Jedna od povoljnih osobina VPS procesa je mogućnost postizanja optimalne makro i mikro strukture površine implanata optimizacijom sprej parametara depozicije praha i rasponom granulacije praha. U cilju postizanja optimalne hrapavosti, otvorene poroznosti i strukture VPS-Ti prevlaka sprovedena je optimizacija depozicije praha sa promenom plazma struje i protokom nosećeg gasa praha (700 A, 35 l/min i 800A, 20 l/min) Ni a jačina plazma struje uz veći protok praha slabije progreva i topi čestice praha obrazujući mikro pore veće veličine i veći udeo otvorenih pora i obrnuto veća plazma struja i manji protok omogućuju bolje topljenje čestica uz formiranje manjeg udela mikro pora i otvorene poroznosti u deponovanim slojevima. Analizom slika ustanovljeno je da se sa optimizacijom parametara u prevlakama mo e formirati otvorena poroznost sa rasponom od 45% do 57% Ispitivanjem karakteristika deponovanih slojeva ustanovljeno je da najoptimalniju hrapavost i udeo otvorenih pora za osteointegraciju imaju slojevi Ti deponovani sa najni om ampera om i najvećim protokom nosećeg gasa praha.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration, Mehanička i mikrostrukturna svojstva VPS-Ti porozne prevlake deponovane na podlogama od legure titana za osteointegraciju",
pages = "59-52",
number = "1",
volume = "61",
doi = "10.5937/zasmat2001052M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Janaćković, Đ., Veljić, D.,& Bajić, D.. (2020). The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 61(1), 52-59.
https://doi.org/10.5937/zasmat2001052M

Mrdak M, Lačnjevac Č, Rakin M, Janaćković Đ, Veljić D, Bajić D. The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration. in Zaštita materijala. 2020;61(1):52-59.
doi:10.5937/zasmat2001052M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Janaćković, Đorđe, Veljić, Darko, Bajić, Darko, "The mechanical and microstructural properties of VPS-Ti porous coating deposited on titanium alloy substrates for osseointegration" in Zaštita materijala, 61, no. 1 (2020):52-59,
https://doi.org/10.5937/zasmat2001052M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Rakin, Marko
AU  - Janaćković, Đorđe
AU  - Veljić, Darko
AU  - Bajić, Darko
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4555
AB  - In this paper analyzed were the mechanical properties and microstructure of the Ni30Al coating layers deposited using atmospheric plasma spray (APS). For deposition of the coating applied was a composite Ni30wt.% Al powder, manufactured by mechanical alloying of granulation below - 180 µm. The coatings mechanical properties were analyzed by microhardness measuring with the HV0.3 method and the bond strength by tension method. For the analysis of the microstructure of the coating layers applied was the method of light and scanning electron microscopy (SEM). Microhardness tests showed that the coating has a wide range of measured values which indicate a heterogeneous multiphase lamellar microstructure of the coating, which was confirmed by metallographic examination of the layers. The multi-phase lamellar microstructure consisted of the initial solid a-Al, y-Ni solutions, formed solid b-NiAl and NiAl martensite solutions, intermetallic compounds y-Ni3Al and Ni2Al3 and the oxide y-Al2O3 phase formed by oxidation of molten Al particles. Based on these tests given was an evaluation of the quality of the coating. The results of the experiment showed that the technological process of production of composite powders significantly affects the mechanical properties and structure of the coating layers.
AB  - U ovom radu analizirane su mehaničke osobine i mikrostruktura slojeva prevlake Ni30Al deponovane atmosferskim plazma sprejom (APS). Za depoziciju prevlake primenjen je kompozitni prah Ni30tež.%Al proizveden mehaničkim legiranjem granulacije ispod - 180 µm. Mehaničke karakteristike prevlake analizirane su merenjem mikrotvrdoće metodom HV0.3 i čvrstoće spoja metodom na zatezanje. Za analizu mikrostrukture slojeva prevlake primenjena je metoda svetlosne i skening elektronske mikroskopije (SEM). Ispitivanja mikrotvrdoće su pokazala da prevlaka ima širok opseg izmerenih vrednosti koje ukazuju na višefaznu heterogenu lamelarnu mikrostrukturu prevlake, koja je potvrđena metalografskaim ispitivanjem slojeva. Višefazna lamelarna mikrostruktura se sastojala od polaznih čvrstih rastvora a-Al, y-Ni, formiranih čvrstih rastvora b-NiAl i NiAl martenzita, intermetalnih jedinjenja y-Ni3Al i Ni2Al3 i oksidne faze y-Al2O3 nastale oksidacijim istopljenih čestica Al. Na osnovu sprovedenih ispitivanja dala se ocena kvaliteta prevlake. Rezultati eksperimenta su pokazali da tehnološki postupak proizvodnje kompozitnih prahova bitno utiče na mehaničke karakteristike i strukturu slojeva prevlake.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Characterization of NiAl layers deposited by atmospheric plasma spray (APS)
T1  - Karakterizacija NiAl slojeva deponovanih atmosferskim plazma sprejom (APS)
EP  - 115
IS  - 2
SP  - 110
VL  - 61
DO  - 10.5937/zasmat2002110M
ER  - 

@article{
author = "Mrdak, Mihailo and Rakin, Marko and Janaćković, Đorđe and Veljić, Darko and Bajić, Darko",
year = "2020",
abstract = "In this paper analyzed were the mechanical properties and microstructure of the Ni30Al coating layers deposited using atmospheric plasma spray (APS). For deposition of the coating applied was a composite Ni30wt.% Al powder, manufactured by mechanical alloying of granulation below - 180 µm. The coatings mechanical properties were analyzed by microhardness measuring with the HV0.3 method and the bond strength by tension method. For the analysis of the microstructure of the coating layers applied was the method of light and scanning electron microscopy (SEM). Microhardness tests showed that the coating has a wide range of measured values which indicate a heterogeneous multiphase lamellar microstructure of the coating, which was confirmed by metallographic examination of the layers. The multi-phase lamellar microstructure consisted of the initial solid a-Al, y-Ni solutions, formed solid b-NiAl and NiAl martensite solutions, intermetallic compounds y-Ni3Al and Ni2Al3 and the oxide y-Al2O3 phase formed by oxidation of molten Al particles. Based on these tests given was an evaluation of the quality of the coating. The results of the experiment showed that the technological process of production of composite powders significantly affects the mechanical properties and structure of the coating layers., U ovom radu analizirane su mehaničke osobine i mikrostruktura slojeva prevlake Ni30Al deponovane atmosferskim plazma sprejom (APS). Za depoziciju prevlake primenjen je kompozitni prah Ni30tež.%Al proizveden mehaničkim legiranjem granulacije ispod - 180 µm. Mehaničke karakteristike prevlake analizirane su merenjem mikrotvrdoće metodom HV0.3 i čvrstoće spoja metodom na zatezanje. Za analizu mikrostrukture slojeva prevlake primenjena je metoda svetlosne i skening elektronske mikroskopije (SEM). Ispitivanja mikrotvrdoće su pokazala da prevlaka ima širok opseg izmerenih vrednosti koje ukazuju na višefaznu heterogenu lamelarnu mikrostrukturu prevlake, koja je potvrđena metalografskaim ispitivanjem slojeva. Višefazna lamelarna mikrostruktura se sastojala od polaznih čvrstih rastvora a-Al, y-Ni, formiranih čvrstih rastvora b-NiAl i NiAl martenzita, intermetalnih jedinjenja y-Ni3Al i Ni2Al3 i oksidne faze y-Al2O3 nastale oksidacijim istopljenih čestica Al. Na osnovu sprovedenih ispitivanja dala se ocena kvaliteta prevlake. Rezultati eksperimenta su pokazali da tehnološki postupak proizvodnje kompozitnih prahova bitno utiče na mehaničke karakteristike i strukturu slojeva prevlake.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Characterization of NiAl layers deposited by atmospheric plasma spray (APS), Karakterizacija NiAl slojeva deponovanih atmosferskim plazma sprejom (APS)",
pages = "115-110",
number = "2",
volume = "61",
doi = "10.5937/zasmat2002110M"
}

Mrdak, M., Rakin, M., Janaćković, Đ., Veljić, D.,& Bajić, D.. (2020). Characterization of NiAl layers deposited by atmospheric plasma spray (APS). in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 61(2), 110-115.
https://doi.org/10.5937/zasmat2002110M

Mrdak M, Rakin M, Janaćković Đ, Veljić D, Bajić D. Characterization of NiAl layers deposited by atmospheric plasma spray (APS). in Zaštita materijala. 2020;61(2):110-115.
doi:10.5937/zasmat2002110M .

Mrdak, Mihailo, Rakin, Marko, Janaćković, Đorđe, Veljić, Darko, Bajić, Darko, "Characterization of NiAl layers deposited by atmospheric plasma spray (APS)" in Zaštita materijala, 61, no. 2 (2020):110-115,
https://doi.org/10.5937/zasmat2002110M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Bajic, Darko
AU  - Veljić, Darko
AU  - Rakin, Marko
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4750
AB  - Titanium dioxide (TiO2) is a multifunctional oxide that is an interesting material for many technological applications. This paper presents the mechanical properties and microstructure of TiO2 coatings resistant to dry sliding friction, corrosion, grain abrasion and erosion of particles at operating temperatures up to 540 degrees C. Layers of TiO2 coatings have been successfully deposited on test samples of steel C.4171 (X15Cr13 EN10027) using the atmospheric plasma spray (APS) process with plasma gun distances of 100 mm and 110 mm from the substrate. The APS procedure is used to produce relatively thick coatings of biocompatible and antibacterial TiO2 ceramic coatings for orthopedic applications. The coatings were deposited using the Plasmadyne company plasma spray system and Metco TiO2 powder, whose particles have an angular morphology produced by the melting and grinding cast blocks. The evaluation of the mechanical properties of the layers was made using the microhardness testing method HV0.3 and the tensile bond strength by tension testing. The analysis of the microstructure of the sprayed TiO2 coating layers was made in accordance with the Pratt & Whitney standard, using optical microscopy (OM). The morphology of the powder particles, the surface of the deposited coating and the coating fractures were examined by scanning electron microscopy. Tests have shown that the layers of TiO2 coatings deposited with a plasma spray distance of 110 mm have good mechanical properties and microstructure, which allow its use in the development of biomedical implants.
T2  - Materiali in Tehnologije
T1  - Mechanical and structural characteristics of atmospheric plasma-sprayed multifunctional tio2 coatings
EP  - 812
IS  - 6
SP  - 807
VL  - 54
DO  - 10.17222/mit.2020.052
ER  - 

@article{
author = "Mrdak, Mihailo and Bajic, Darko and Veljić, Darko and Rakin, Marko",
year = "2020",
abstract = "Titanium dioxide (TiO2) is a multifunctional oxide that is an interesting material for many technological applications. This paper presents the mechanical properties and microstructure of TiO2 coatings resistant to dry sliding friction, corrosion, grain abrasion and erosion of particles at operating temperatures up to 540 degrees C. Layers of TiO2 coatings have been successfully deposited on test samples of steel C.4171 (X15Cr13 EN10027) using the atmospheric plasma spray (APS) process with plasma gun distances of 100 mm and 110 mm from the substrate. The APS procedure is used to produce relatively thick coatings of biocompatible and antibacterial TiO2 ceramic coatings for orthopedic applications. The coatings were deposited using the Plasmadyne company plasma spray system and Metco TiO2 powder, whose particles have an angular morphology produced by the melting and grinding cast blocks. The evaluation of the mechanical properties of the layers was made using the microhardness testing method HV0.3 and the tensile bond strength by tension testing. The analysis of the microstructure of the sprayed TiO2 coating layers was made in accordance with the Pratt & Whitney standard, using optical microscopy (OM). The morphology of the powder particles, the surface of the deposited coating and the coating fractures were examined by scanning electron microscopy. Tests have shown that the layers of TiO2 coatings deposited with a plasma spray distance of 110 mm have good mechanical properties and microstructure, which allow its use in the development of biomedical implants.",
journal = "Materiali in Tehnologije",
title = "Mechanical and structural characteristics of atmospheric plasma-sprayed multifunctional tio2 coatings",
pages = "812-807",
number = "6",
volume = "54",
doi = "10.17222/mit.2020.052"
}

Mrdak, M., Bajic, D., Veljić, D.,& Rakin, M.. (2020). Mechanical and structural characteristics of atmospheric plasma-sprayed multifunctional tio2 coatings. in Materiali in Tehnologije, 54(6), 807-812.
https://doi.org/10.17222/mit.2020.052

Mrdak M, Bajic D, Veljić D, Rakin M. Mechanical and structural characteristics of atmospheric plasma-sprayed multifunctional tio2 coatings. in Materiali in Tehnologije. 2020;54(6):807-812.
doi:10.17222/mit.2020.052 .

Mrdak, Mihailo, Bajic, Darko, Veljić, Darko, Rakin, Marko, "Mechanical and structural characteristics of atmospheric plasma-sprayed multifunctional tio2 coatings" in Materiali in Tehnologije, 54, no. 6 (2020):807-812,
https://doi.org/10.17222/mit.2020.052 . .

TY  - BOOK
AU  - Вељић, Дарко
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6921
PB  - Београд : Технолошко-металуршки факултет Универзитета
T1  - Нумеричка симулација процеса заваривања трењем мешањем легура алуминијума високе чврстоће : монографија
EP  - 154
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6921
ER  - 

@book{
author = "Вељић, Дарко",
year = "2020",
publisher = "Београд : Технолошко-металуршки факултет Универзитета",
title = "Нумеричка симулација процеса заваривања трењем мешањем легура алуминијума високе чврстоће : монографија",
pages = "154-1",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6921"
}

Вељић, Д.. (2020). Нумеричка симулација процеса заваривања трењем мешањем легура алуминијума високе чврстоће : монографија. 
Београд : Технолошко-металуршки факултет Универзитета., 1-154.
https://hdl.handle.net/21.15107/rcub_technorep_6921

Вељић Д. Нумеричка симулација процеса заваривања трењем мешањем легура алуминијума високе чврстоће : монографија. 2020;:1-154.
https://hdl.handle.net/21.15107/rcub_technorep_6921 .

Вељић, Дарко, "Нумеричка симулација процеса заваривања трењем мешањем легура алуминијума високе чврстоће : монографија" (2020):1-154,
https://hdl.handle.net/21.15107/rcub_technorep_6921 .

TY  - JOUR
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Mrdak, Mihailo
AU  - Sedmak, Aleksandar
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4107
AB  - Friction stir welding is one of the procedures for joining the parts in solid state. Thermo-mechanical simulation of the friction stir welding of high-strength aluminium alloys 2024 T3 and 2024 T351 is considered in this work. Numerical models corresponding to the linear welding stage are developed in Abaqus software package. The material behaviour is modelled by Johnson-Cook law (which relates the yield stress with temperature, strain and strain rate), and the Arbitrary Lagrangian-Eulerian technique is applied. The difference in thermo-mechanical behaviour between the two materials has been analysed and commented. The main quantities which are considered are the temperature in the weld area, plastic strain, as well as the rate of heat generation during the welding process.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Temperature fields in linear stage of friction stir welding effect of different material properties
EP  - 3992
IS  - 6
SP  - 3985
VL  - 23
DO  - 10.2298/TSCI181015264V
ER  - 

@article{
author = "Veljić, Darko and Rakin, Marko and Međo, Bojan and Mrdak, Mihailo and Sedmak, Aleksandar",
year = "2019",
abstract = "Friction stir welding is one of the procedures for joining the parts in solid state. Thermo-mechanical simulation of the friction stir welding of high-strength aluminium alloys 2024 T3 and 2024 T351 is considered in this work. Numerical models corresponding to the linear welding stage are developed in Abaqus software package. The material behaviour is modelled by Johnson-Cook law (which relates the yield stress with temperature, strain and strain rate), and the Arbitrary Lagrangian-Eulerian technique is applied. The difference in thermo-mechanical behaviour between the two materials has been analysed and commented. The main quantities which are considered are the temperature in the weld area, plastic strain, as well as the rate of heat generation during the welding process.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Temperature fields in linear stage of friction stir welding effect of different material properties",
pages = "3992-3985",
number = "6",
volume = "23",
doi = "10.2298/TSCI181015264V"
}

Veljić, D., Rakin, M., Međo, B., Mrdak, M.,& Sedmak, A.. (2019). Temperature fields in linear stage of friction stir welding effect of different material properties. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 23(6), 3985-3992.
https://doi.org/10.2298/TSCI181015264V

Veljić D, Rakin M, Međo B, Mrdak M, Sedmak A. Temperature fields in linear stage of friction stir welding effect of different material properties. in Thermal Science. 2019;23(6):3985-3992.
doi:10.2298/TSCI181015264V .

Veljić, Darko, Rakin, Marko, Međo, Bojan, Mrdak, Mihailo, Sedmak, Aleksandar, "Temperature fields in linear stage of friction stir welding effect of different material properties" in Thermal Science, 23, no. 6 (2019):3985-3992,
https://doi.org/10.2298/TSCI181015264V . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Međo, Bojan
AU  - Veljić, Darko
AU  - Arsić, Miodrag
AU  - Rakin, Marko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4237
AB  - In this paper, structural and mechanical properties of APS - atmospheric plasma spray coating Al-12Si are presented. The aim of the research was the optimisation of the flow of powder to produce layers with optimal mechanical and structural properties that will be applied to the worn out parts of airplanes. Three groups of samples were produced, by utilising three powder feed rates: 30 g/min, 45 g/min and 60 g/min. Evaluation of layers' microhardness was done using HV0.3 method and the bond strength was determined by testing of tensile strength. Surface morphology of the deposited powder particles was examined on SEM (Scanning Electron Microscope). The microstructure of the coating with the best measured mechanical properties was subsequently examined in etched condition on optical microscope and SEM (in accordance with the standard PN 585005, Pratt & Whitney). Also, fracture morphology of this coating in deposited state was examined using SEM. It was found that powder feed control with atmospheric plasma spraying can produce dense layers of Al-12Si coating with good bond strength.
PB  - Walter de Gruyter Gmbh, Berlin
T2  - Reviews on Advanced Materials Science
T1  - The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating
EP  - 81
IS  - 1
SP  - 75
VL  - 58
DO  - 10.1515/rams-2019-0007
ER  - 

@article{
author = "Mrdak, Mihailo and Međo, Bojan and Veljić, Darko and Arsić, Miodrag and Rakin, Marko",
year = "2019",
abstract = "In this paper, structural and mechanical properties of APS - atmospheric plasma spray coating Al-12Si are presented. The aim of the research was the optimisation of the flow of powder to produce layers with optimal mechanical and structural properties that will be applied to the worn out parts of airplanes. Three groups of samples were produced, by utilising three powder feed rates: 30 g/min, 45 g/min and 60 g/min. Evaluation of layers' microhardness was done using HV0.3 method and the bond strength was determined by testing of tensile strength. Surface morphology of the deposited powder particles was examined on SEM (Scanning Electron Microscope). The microstructure of the coating with the best measured mechanical properties was subsequently examined in etched condition on optical microscope and SEM (in accordance with the standard PN 585005, Pratt & Whitney). Also, fracture morphology of this coating in deposited state was examined using SEM. It was found that powder feed control with atmospheric plasma spraying can produce dense layers of Al-12Si coating with good bond strength.",
publisher = "Walter de Gruyter Gmbh, Berlin",
journal = "Reviews on Advanced Materials Science",
title = "The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating",
pages = "81-75",
number = "1",
volume = "58",
doi = "10.1515/rams-2019-0007"
}

Mrdak, M., Međo, B., Veljić, D., Arsić, M.,& Rakin, M.. (2019). The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating. in Reviews on Advanced Materials Science
Walter de Gruyter Gmbh, Berlin., 58(1), 75-81.
https://doi.org/10.1515/rams-2019-0007

Mrdak M, Međo B, Veljić D, Arsić M, Rakin M. The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating. in Reviews on Advanced Materials Science. 2019;58(1):75-81.
doi:10.1515/rams-2019-0007 .

Mrdak, Mihailo, Međo, Bojan, Veljić, Darko, Arsić, Miodrag, Rakin, Marko, "The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating" in Reviews on Advanced Materials Science, 58, no. 1 (2019):75-81,
https://doi.org/10.1515/rams-2019-0007 . .

TY  - JOUR
AU  - Musrati, Walid
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Stefane, Primoz
AU  - Veljić, Darko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4055
AB  - The topic of this work is analysis of fracture behaviour and resistance of the thin-walled seamless and seam steel pipes, through application of the recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend). The main loading of these pipes in exploitation is internal pressure, which is why axial defects present a significant threat to their integrity and work safety. The ring-shaped specimen geometry is fairly simple to fabricate from a new or exploited pipeline and the specimens have the same thermo-mechanical treatment, assembly conditions, etc. as the actual structure. Experimental-numerical procedure is applied for prediction of the fracture behaviour; this included material characterisation, testing of ring specimens by bending, as well as micromechanical analysis of ductile fracture. In experimental testing, the deformation of the specimens is monitored by using the stereometric measurement system. Numerical analysis is performed in software package Simulia Abaqus, including the application of the micromechanical Complete Gurson model (CGM). The results obtained in this study, along with some previously published results, lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of cylindrical elements such as pipes.
PB  - Elsevier, Amsterdam
T2  - Theoretical and Applied Fracture Mechanics
T1  - Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens
VL  - 103
DO  - 10.1016/j.tafmec.2019.102302
ER  - 

@article{
author = "Musrati, Walid and Međo, Bojan and Gubeljak, Nenad and Stefane, Primoz and Veljić, Darko and Sedmak, Aleksandar and Rakin, Marko",
year = "2019",
abstract = "The topic of this work is analysis of fracture behaviour and resistance of the thin-walled seamless and seam steel pipes, through application of the recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend). The main loading of these pipes in exploitation is internal pressure, which is why axial defects present a significant threat to their integrity and work safety. The ring-shaped specimen geometry is fairly simple to fabricate from a new or exploited pipeline and the specimens have the same thermo-mechanical treatment, assembly conditions, etc. as the actual structure. Experimental-numerical procedure is applied for prediction of the fracture behaviour; this included material characterisation, testing of ring specimens by bending, as well as micromechanical analysis of ductile fracture. In experimental testing, the deformation of the specimens is monitored by using the stereometric measurement system. Numerical analysis is performed in software package Simulia Abaqus, including the application of the micromechanical Complete Gurson model (CGM). The results obtained in this study, along with some previously published results, lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of cylindrical elements such as pipes.",
publisher = "Elsevier, Amsterdam",
journal = "Theoretical and Applied Fracture Mechanics",
title = "Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens",
volume = "103",
doi = "10.1016/j.tafmec.2019.102302"
}

Musrati, W., Međo, B., Gubeljak, N., Stefane, P., Veljić, D., Sedmak, A.,& Rakin, M.. (2019). Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens. in Theoretical and Applied Fracture Mechanics
Elsevier, Amsterdam., 103.
https://doi.org/10.1016/j.tafmec.2019.102302

Musrati W, Međo B, Gubeljak N, Stefane P, Veljić D, Sedmak A, Rakin M. Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens. in Theoretical and Applied Fracture Mechanics. 2019;103.
doi:10.1016/j.tafmec.2019.102302 .

Musrati, Walid, Međo, Bojan, Gubeljak, Nenad, Stefane, Primoz, Veljić, Darko, Sedmak, Aleksandar, Rakin, Marko, "Fracture assessment of seam and seamless steel pipes by application of the ring-shaped bending specimens" in Theoretical and Applied Fracture Mechanics, 103 (2019),
https://doi.org/10.1016/j.tafmec.2019.102302 . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Veljić, Darko
AU  - Bajić, Nikola
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4273
AB  - Protective vacuum plasma spray VPS - NiCoCrAlY coating is used on sections of gas turbines to allow for longer and more reliable operation of sections exposed to aggressive effects of high temperature oxidation. Depositing of NiCoCrAlY alloy powder was done with the vacuum plasma spray system of the Plasma Technik - AG Companyon the A-2000 control unit using the plasma F4 gun. To test the mechanical properties and microstructure of the NiCoCrAlY coating, the powder was deposited on Č.4171 (X15Cr13 EN10027) steel substrates.To examine the microstructure of the coating in the heat-treated state, the powder was deposited on an IN738LC alloy substrate, which was pre-heated to a temperature of 750 to 800°C before deposition of the powder. The coating with the IN738LC alloy substrate was heat-treated at 1150°C for 2 hours in anargon shielded atmosphere. Mechanical testing of the microhardness of the coating was done using the HV0.3 method and the tensile bond strength using the tension method. The morphology of the powder particles and the morphology of the surface of the deposited coating were examined using a scanning electron microscope (SEM). The microstructure of coating layers in deposited state was tested on an optical microscope (OM). After thermal treatment, etching of the coating was done in the reagent CuSO4 + HCl aqueous solution. Analysis of the microstructure of the coating after etching was performed on the SEM, on the basis of which a score of the quality of the diffusion VPS - NiCoCrAlY coating was given.
AB  - Zaštitna vakuum plazma sprej VPS - NiCoCrAlY prevlaka se koriste na sekcijama gasnih turbina da bi se omogućio duži i pouzdaniji rad sekcijama izloženim agresivnom napadu visokotemperaturne oksidacije. Deponovanje praha od legure NiCoCrAlY urađeno je vakuum plazma sprej sistemom firme Plasma Technik - AG na upravljačkoj jedinici A-2000 sa plazma pištoljem F4. Za ispitivanje mehaničkih karakteristika i mikrostrukture NiCoCrAlY prevlake, prah je deponovan na substratima od čelika Č.4171 (X15Cr13 EN10027). Za ispitivanje mikrostrukture prevlake u termički obrađenom stanju, prah je deponovan na substratu od legure IN738LC, koji je pre depozicije praha bio predgrejan na temperaturi od 750 do 800°C. Prevlaka je sa substratom od legure IN738LC termički tretirana na 1150°C u trajanju od 2 sata u zaštitnoj atmosferi argona. Mehanička ispitivanja mikrotvrdoće prevlake urađena su metodom HV0.3 i zatezna čvrstoća spoja metodom na zatezanje. Morfologija čestica praha i morfologija površine deponovane prevlake ispitana je na skening elektronskom mikroskopu (SEM). Mikrostruktura slojeva prevlake u deponovanom stanju ispitana je na optičkom mikroskopu (OM). Posle termičke obrade sprovedeno je nagrizanje prevlake u reagensu CuSO4 + HCl vodeni rastvor. Analiza mikrostrukture prevlake posle nagrizanja urađena je na SEM-u, na osnovu čega se dala ocena kvaliteta difuzione VPS - NiCoCrAlY prevlake.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation
T1  - Karakterizacija vakuum plazma sprej prevlake NiCoCrAlY otporne na visokotemperaturnu oksidaciju
EP  - 341
IS  - 4
SP  - 336
VL  - 60
DO  - 10.5937/zasmat1904336M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Veljić, Darko and Bajić, Nikola",
year = "2019",
abstract = "Protective vacuum plasma spray VPS - NiCoCrAlY coating is used on sections of gas turbines to allow for longer and more reliable operation of sections exposed to aggressive effects of high temperature oxidation. Depositing of NiCoCrAlY alloy powder was done with the vacuum plasma spray system of the Plasma Technik - AG Companyon the A-2000 control unit using the plasma F4 gun. To test the mechanical properties and microstructure of the NiCoCrAlY coating, the powder was deposited on Č.4171 (X15Cr13 EN10027) steel substrates.To examine the microstructure of the coating in the heat-treated state, the powder was deposited on an IN738LC alloy substrate, which was pre-heated to a temperature of 750 to 800°C before deposition of the powder. The coating with the IN738LC alloy substrate was heat-treated at 1150°C for 2 hours in anargon shielded atmosphere. Mechanical testing of the microhardness of the coating was done using the HV0.3 method and the tensile bond strength using the tension method. The morphology of the powder particles and the morphology of the surface of the deposited coating were examined using a scanning electron microscope (SEM). The microstructure of coating layers in deposited state was tested on an optical microscope (OM). After thermal treatment, etching of the coating was done in the reagent CuSO4 + HCl aqueous solution. Analysis of the microstructure of the coating after etching was performed on the SEM, on the basis of which a score of the quality of the diffusion VPS - NiCoCrAlY coating was given., Zaštitna vakuum plazma sprej VPS - NiCoCrAlY prevlaka se koriste na sekcijama gasnih turbina da bi se omogućio duži i pouzdaniji rad sekcijama izloženim agresivnom napadu visokotemperaturne oksidacije. Deponovanje praha od legure NiCoCrAlY urađeno je vakuum plazma sprej sistemom firme Plasma Technik - AG na upravljačkoj jedinici A-2000 sa plazma pištoljem F4. Za ispitivanje mehaničkih karakteristika i mikrostrukture NiCoCrAlY prevlake, prah je deponovan na substratima od čelika Č.4171 (X15Cr13 EN10027). Za ispitivanje mikrostrukture prevlake u termički obrađenom stanju, prah je deponovan na substratu od legure IN738LC, koji je pre depozicije praha bio predgrejan na temperaturi od 750 do 800°C. Prevlaka je sa substratom od legure IN738LC termički tretirana na 1150°C u trajanju od 2 sata u zaštitnoj atmosferi argona. Mehanička ispitivanja mikrotvrdoće prevlake urađena su metodom HV0.3 i zatezna čvrstoća spoja metodom na zatezanje. Morfologija čestica praha i morfologija površine deponovane prevlake ispitana je na skening elektronskom mikroskopu (SEM). Mikrostruktura slojeva prevlake u deponovanom stanju ispitana je na optičkom mikroskopu (OM). Posle termičke obrade sprovedeno je nagrizanje prevlake u reagensu CuSO4 + HCl vodeni rastvor. Analiza mikrostrukture prevlake posle nagrizanja urađena je na SEM-u, na osnovu čega se dala ocena kvaliteta difuzione VPS - NiCoCrAlY prevlake.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation, Karakterizacija vakuum plazma sprej prevlake NiCoCrAlY otporne na visokotemperaturnu oksidaciju",
pages = "341-336",
number = "4",
volume = "60",
doi = "10.5937/zasmat1904336M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Veljić, D.,& Bajić, N.. (2019). Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(4), 336-341.
https://doi.org/10.5937/zasmat1904336M

Mrdak M, Lačnjevac Č, Rakin M, Veljić D, Bajić N. Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation. in Zaštita materijala. 2019;60(4):336-341.
doi:10.5937/zasmat1904336M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Veljić, Darko, Bajić, Nikola, "Characterization of vacuum plasma spray NiCoCrAlY coating resistant to high temperature oxidation" in Zaštita materijala, 60, no. 4 (2019):336-341,
https://doi.org/10.5937/zasmat1904336M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Bajić, Nikola
AU  - Veljić, Darko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4275
AB  - This paper presents the results of testing mechanical and structural characteristics of plasma spray coating Al2O328wt.%MgO. Metal oxide MgO in a complex oxide Al2O328wt.%MgO modifies the properties of Al2O3 ceramics by forming spinel MgAl2O4 with excellent biomedical characteristics. The coating layers were deposited by atmospheric plasma spraying process (APS) on steel substrates of stainless steel X15Cr13 (EN 1.4024). The aim of this study was to examine the effect of the strength of the plasma current (700A, 800A and 900A) on the mechanical properties of the Al2O3MgO coating, pore content and microstructure of the layers. Testing microhardness of the layers using the HV0.3 method, the bond strength using the tensile method and microstructure using optical microscopy (OM) and scanning electron microscopy (SEM) have confirmed that, by controlling the plasma current, layers of the coating system Al2O328wt.%MgO can be deposited with good mechanical and microstructural characteristics suitable for use in manufacture of implants.
AB  - U ovom radu su prikazani rezultati ispitivanja mehaničkih i strukturnih karakteristika plazma sprej prevlake Al2O328tež.%MgO. Metalni oksid MgO u kompleksnom oksidu Al2O328tež.%MgO modifikuje osobine Al2O3 keramike formiranjem spinela MgAl2O4 odličnih biomedicinskih karakteristika. Slojevi prevlake su deponovani atmosferski plazma sprej procesom (APS) na čeličnim podlogama od nerđajućeg čelika X15Cr13 (EN 1.4024). Cilj ovog rada je bio da se ispita efekat jačine plazma struje (700A, 800A i 900A) na mehaničke osobine prevlake Al2O3MgO, sadržaj pora i mikrostrukturu slojeva. Ispitivanja mikrotvrdoće slojeva metodama HV0.3, čvrstoće spoja zatezanjem i mikrostrukture optičkom mikroskopijom (OM) i skening elektronskom mikroskopijom (SEM) su potvrdila da se sa kontrolom plazma struje mogu deponovati slojevi sistema prevlake Al2O328tež.%MgO dobrih mehaničkih i mikrostrukturih karakteristika pogodnih za primenu u eksploataciji za proizvodnju implanata.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Characterization of plasma spray bioinert coating Al2O328wt.%MgO
T1  - Karakterizacija plazma sprej bioinertne prevlake Al2O328tež.%MgO
EP  - 49
IS  - 1
SP  - 44
VL  - 60
DO  - 10.5937/zasmat1901044M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Bajić, Nikola and Veljić, Darko",
year = "2019",
abstract = "This paper presents the results of testing mechanical and structural characteristics of plasma spray coating Al2O328wt.%MgO. Metal oxide MgO in a complex oxide Al2O328wt.%MgO modifies the properties of Al2O3 ceramics by forming spinel MgAl2O4 with excellent biomedical characteristics. The coating layers were deposited by atmospheric plasma spraying process (APS) on steel substrates of stainless steel X15Cr13 (EN 1.4024). The aim of this study was to examine the effect of the strength of the plasma current (700A, 800A and 900A) on the mechanical properties of the Al2O3MgO coating, pore content and microstructure of the layers. Testing microhardness of the layers using the HV0.3 method, the bond strength using the tensile method and microstructure using optical microscopy (OM) and scanning electron microscopy (SEM) have confirmed that, by controlling the plasma current, layers of the coating system Al2O328wt.%MgO can be deposited with good mechanical and microstructural characteristics suitable for use in manufacture of implants., U ovom radu su prikazani rezultati ispitivanja mehaničkih i strukturnih karakteristika plazma sprej prevlake Al2O328tež.%MgO. Metalni oksid MgO u kompleksnom oksidu Al2O328tež.%MgO modifikuje osobine Al2O3 keramike formiranjem spinela MgAl2O4 odličnih biomedicinskih karakteristika. Slojevi prevlake su deponovani atmosferski plazma sprej procesom (APS) na čeličnim podlogama od nerđajućeg čelika X15Cr13 (EN 1.4024). Cilj ovog rada je bio da se ispita efekat jačine plazma struje (700A, 800A i 900A) na mehaničke osobine prevlake Al2O3MgO, sadržaj pora i mikrostrukturu slojeva. Ispitivanja mikrotvrdoće slojeva metodama HV0.3, čvrstoće spoja zatezanjem i mikrostrukture optičkom mikroskopijom (OM) i skening elektronskom mikroskopijom (SEM) su potvrdila da se sa kontrolom plazma struje mogu deponovati slojevi sistema prevlake Al2O328tež.%MgO dobrih mehaničkih i mikrostrukturih karakteristika pogodnih za primenu u eksploataciji za proizvodnju implanata.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Characterization of plasma spray bioinert coating Al2O328wt.%MgO, Karakterizacija plazma sprej bioinertne prevlake Al2O328tež.%MgO",
pages = "49-44",
number = "1",
volume = "60",
doi = "10.5937/zasmat1901044M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Bajić, N.,& Veljić, D.. (2019). Characterization of plasma spray bioinert coating Al2O328wt.%MgO. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(1), 44-49.
https://doi.org/10.5937/zasmat1901044M

Mrdak M, Lačnjevac Č, Rakin M, Bajić N, Veljić D. Characterization of plasma spray bioinert coating Al2O328wt.%MgO. in Zaštita materijala. 2019;60(1):44-49.
doi:10.5937/zasmat1901044M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Bajić, Nikola, Veljić, Darko, "Characterization of plasma spray bioinert coating Al2O328wt.%MgO" in Zaštita materijala, 60, no. 1 (2019):44-49,
https://doi.org/10.5937/zasmat1901044M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Bajić, Nikola
AU  - Veljić, Darko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4276
AB  - ZrO25CaO is a versatile class of material that can be sintered or plasma spray deposited in combination with other materials on the implant substrate. Due to brittleness the organic ceramic hydroxyapatite Ca10(PO4)6(OH)2 - (HA) is not suitable for use as a separate material in the process of making implants. In order to improve the mechanical characteristics and osteoconductivity, to HA ceramics added are dual systems of oxide solid solutions, of which one is also ZrO25CaO. Ceramics ZrO2-CaO(95%-5%) as a biomaterial facilitates osteoconductivity in new bone formation around the implant. This paper represents the need to develop a system of ZrO25CaO/NiCrAl coatings that will with their mechanical and structural characteristics find application on implant parts. In this context, using the atmospheric plasma spray process deposited were the ZrO25CaO/NiCrAl coatings system on stainless steel substrates X15Cr13 (EN 1.4024). Analysis of the morphology of the powder particles and the surface of the ZrO25CaO coatings was carried out on the SEM. The microstructure of the layers of the coatings system was analyzed on the OM. Mechanical properties of the coating were determined by examining the microhardness using the HV0.3 method and bond strength by tensile testing according to the standard (ASTMC633-1).
AB  - ZrO25CaO je višenamenska klasa materijala koja može da se sinteruje ili plazma sprej deponuje u kombinaciji sa drugim materijalima na podlogama implantata. Zbog krtosti organska keramika hidroksiapatit Ca10(PO4)6(OH)2 - (HA) nije pogodna za primenu kao zaseban materijal u procesu izrade implantata. U cilju poboljšanja osteokonduktivnosti i mehaničkih karakteristika, keramici HA se dodavaju dvojni sistemi čvrstih rastvora oksida od kojih je jedan i ZrO25CaO. Keramika ZrO2-CaO(95%-5%) kao biomaterijal olakšava osteokonduktivnost u novom formiranju kostiju oko implantata. Ovaj rad predstavlja potrebu za izradom sistema ZrO25CaO/NiCrAl prevlaka koje će po svojim mehaničkim i strukturnim karakteristikama naći primenu na delovima implantata. U tom kontekstu atmosferskim plazma sprej procesom deponovan je sistem prevlaka ZrO25CaO/NiCrAl na čeličnim podlogama od nerđajućeg čelika X15Cr13 (EN 1.4024). Analiza morfologije čestica praha i površine prevlaka ZrO25CaO sprovedena je na SEM-u. Mikrostruktura slojeva sistema prevlaka ispitana je na OM-u. Mehaničke karakteristike prevlaka su sprovedene ispitivanjem mikrotvrdoće metodom HV0.3 i čvrstoće spoja ispitivanjem na zatezanje po standardu (ASTMC633-1).
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system
T1  - Mehaničke osobine i mikrostruktura sistema prevlaka ZrO25CaO/NiCrAl
EP  - 151
IS  - 2
SP  - 147
VL  - 60
DO  - 10.5937/zasmat1902147M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Bajić, Nikola and Veljić, Darko",
year = "2019",
abstract = "ZrO25CaO is a versatile class of material that can be sintered or plasma spray deposited in combination with other materials on the implant substrate. Due to brittleness the organic ceramic hydroxyapatite Ca10(PO4)6(OH)2 - (HA) is not suitable for use as a separate material in the process of making implants. In order to improve the mechanical characteristics and osteoconductivity, to HA ceramics added are dual systems of oxide solid solutions, of which one is also ZrO25CaO. Ceramics ZrO2-CaO(95%-5%) as a biomaterial facilitates osteoconductivity in new bone formation around the implant. This paper represents the need to develop a system of ZrO25CaO/NiCrAl coatings that will with their mechanical and structural characteristics find application on implant parts. In this context, using the atmospheric plasma spray process deposited were the ZrO25CaO/NiCrAl coatings system on stainless steel substrates X15Cr13 (EN 1.4024). Analysis of the morphology of the powder particles and the surface of the ZrO25CaO coatings was carried out on the SEM. The microstructure of the layers of the coatings system was analyzed on the OM. Mechanical properties of the coating were determined by examining the microhardness using the HV0.3 method and bond strength by tensile testing according to the standard (ASTMC633-1)., ZrO25CaO je višenamenska klasa materijala koja može da se sinteruje ili plazma sprej deponuje u kombinaciji sa drugim materijalima na podlogama implantata. Zbog krtosti organska keramika hidroksiapatit Ca10(PO4)6(OH)2 - (HA) nije pogodna za primenu kao zaseban materijal u procesu izrade implantata. U cilju poboljšanja osteokonduktivnosti i mehaničkih karakteristika, keramici HA se dodavaju dvojni sistemi čvrstih rastvora oksida od kojih je jedan i ZrO25CaO. Keramika ZrO2-CaO(95%-5%) kao biomaterijal olakšava osteokonduktivnost u novom formiranju kostiju oko implantata. Ovaj rad predstavlja potrebu za izradom sistema ZrO25CaO/NiCrAl prevlaka koje će po svojim mehaničkim i strukturnim karakteristikama naći primenu na delovima implantata. U tom kontekstu atmosferskim plazma sprej procesom deponovan je sistem prevlaka ZrO25CaO/NiCrAl na čeličnim podlogama od nerđajućeg čelika X15Cr13 (EN 1.4024). Analiza morfologije čestica praha i površine prevlaka ZrO25CaO sprovedena je na SEM-u. Mikrostruktura slojeva sistema prevlaka ispitana je na OM-u. Mehaničke karakteristike prevlaka su sprovedene ispitivanjem mikrotvrdoće metodom HV0.3 i čvrstoće spoja ispitivanjem na zatezanje po standardu (ASTMC633-1).",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system, Mehaničke osobine i mikrostruktura sistema prevlaka ZrO25CaO/NiCrAl",
pages = "151-147",
number = "2",
volume = "60",
doi = "10.5937/zasmat1902147M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Bajić, N.,& Veljić, D.. (2019). Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(2), 147-151.
https://doi.org/10.5937/zasmat1902147M

Mrdak M, Lačnjevac Č, Rakin M, Bajić N, Veljić D. Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system. in Zaštita materijala. 2019;60(2):147-151.
doi:10.5937/zasmat1902147M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Bajić, Nikola, Veljić, Darko, "Mechanical properties and microstructure of the ZrO25CaO/NiCrAl coating system" in Zaštita materijala, 60, no. 2 (2019):147-151,
https://doi.org/10.5937/zasmat1902147M . .

TY  - JOUR
AU  - Mrdak, Mihailo
AU  - Lačnjevac, Časlav
AU  - Rakin, Marko
AU  - Veljić, Darko
AU  - Bajić, Nikola
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4277
AB  - Molybdenum coatings due to their excellent wear resistant properties and sliding characteristics under dry friction conditions are often used in applications to resist friction and dry sliding. Since molybdenum metal is susceptible to oxidation, in this study, the molybdenum coating layers were successfully deposited at low pressure inert gas Ar using vacuum plasma spray technology (VPS). Characterization of the Mo coating was performed by measuring the microhardness of the coating layers using the Vickers HV0.3 method, the bond strength by tensile testing and the microstructure by optical microscopy (OM) and scanning electron microscopy (SEM). The microstructure of the coating layers was tested in deposited stateand after etching. The etching reagent used was NH3·H2O and H2O2 with a volume ratio of 1:2. The results showed that the coating has good mechanical properties, microhardness and high adhesion/cohesion strength. Layers of VPS - Mo coatings were composed of well-melted powder particles, partially unmelted particles with a good bond in the coating layers and micropores with a share below 0.5%. It was found that the microstructure of the coating consists mainly of lamellar structure and columnar crystal Mo grains. Tests have shown that the VPS - Mo coating layers have mechanical characteristics and a microstructure which fully enables the use of the coating on surfaces of parts which are required to have good sliding properties, resistance to wear and corrosion.
AB  - Prevlake molibdena se zbog svojih odličnih osobina na habanje i kliznih svojstva u uslovima suvog trenja često koriste u aplikacijama da se odupru trenju i suvom klizanju. Pošto je molibden metal osetljiv na oksidaciju, u ovoj studiji slojevi prevlake molibdena su uspešno deponovani na niskom pritisku inertnog gasa Ar vacuum plazma sprej tehnologijom (VPS). Karakterizacija prevlake Mo je izvršena merenjem mikrotvrdoće slojeva prevlake metodom Vickers HV0.3, čvrstoće spoja ispitivanjem na zatezanje i mikrostrukture metodom optičke mikroskopije (OM) i skening elektronske mikroskopije (SEM). Mikrostruktura slojeva prevlake je ispitana u deponovanom stanju i posle nagrizanja. Za nagrizanje se koristio reagens NH3·H2O i H2O2 sa zapreminskim odnosom 1:2. Dobijeni rezultati su pokazali da prevlaka ima dobre mehaničke karakteristike, mikrotvrdoću i visoku adheziono / kohezionu čvrstoću. Slojevi VPS - Mo prevlake su se sastojali od dobro istopljenih čestica praha, delimično neistopljenih čestica sa dobrom vezom u slojevima prevlake i mikro pora sa udelom ispod 0,5%. Utvrđeno je da se mikrostruktura prevlake uglavnom sastoji od lamelarne strukture i stubastih kristalnih zrna Mo. Ispitivanja su pokazala da VPS - Mo slojevi prevlake imaju mehaničke karakteristike i mikrostrukturu koje u potpunosti omogućavaju primenu prevlake na površinama delova od kojih se zahteva da imaju dobra klizna svojstva, otpornost na habanje i koroziju.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process
T1  - Mehanička svojstva i mikrostruktura slojeva prevlake molibdena deponovane vakuum plazma sprej procesom
EP  - 276
IS  - 3
SP  - 271
VL  - 60
DO  - 10.5937/zasmat1903271M
ER  - 

@article{
author = "Mrdak, Mihailo and Lačnjevac, Časlav and Rakin, Marko and Veljić, Darko and Bajić, Nikola",
year = "2019",
abstract = "Molybdenum coatings due to their excellent wear resistant properties and sliding characteristics under dry friction conditions are often used in applications to resist friction and dry sliding. Since molybdenum metal is susceptible to oxidation, in this study, the molybdenum coating layers were successfully deposited at low pressure inert gas Ar using vacuum plasma spray technology (VPS). Characterization of the Mo coating was performed by measuring the microhardness of the coating layers using the Vickers HV0.3 method, the bond strength by tensile testing and the microstructure by optical microscopy (OM) and scanning electron microscopy (SEM). The microstructure of the coating layers was tested in deposited stateand after etching. The etching reagent used was NH3·H2O and H2O2 with a volume ratio of 1:2. The results showed that the coating has good mechanical properties, microhardness and high adhesion/cohesion strength. Layers of VPS - Mo coatings were composed of well-melted powder particles, partially unmelted particles with a good bond in the coating layers and micropores with a share below 0.5%. It was found that the microstructure of the coating consists mainly of lamellar structure and columnar crystal Mo grains. Tests have shown that the VPS - Mo coating layers have mechanical characteristics and a microstructure which fully enables the use of the coating on surfaces of parts which are required to have good sliding properties, resistance to wear and corrosion., Prevlake molibdena se zbog svojih odličnih osobina na habanje i kliznih svojstva u uslovima suvog trenja često koriste u aplikacijama da se odupru trenju i suvom klizanju. Pošto je molibden metal osetljiv na oksidaciju, u ovoj studiji slojevi prevlake molibdena su uspešno deponovani na niskom pritisku inertnog gasa Ar vacuum plazma sprej tehnologijom (VPS). Karakterizacija prevlake Mo je izvršena merenjem mikrotvrdoće slojeva prevlake metodom Vickers HV0.3, čvrstoće spoja ispitivanjem na zatezanje i mikrostrukture metodom optičke mikroskopije (OM) i skening elektronske mikroskopije (SEM). Mikrostruktura slojeva prevlake je ispitana u deponovanom stanju i posle nagrizanja. Za nagrizanje se koristio reagens NH3·H2O i H2O2 sa zapreminskim odnosom 1:2. Dobijeni rezultati su pokazali da prevlaka ima dobre mehaničke karakteristike, mikrotvrdoću i visoku adheziono / kohezionu čvrstoću. Slojevi VPS - Mo prevlake su se sastojali od dobro istopljenih čestica praha, delimično neistopljenih čestica sa dobrom vezom u slojevima prevlake i mikro pora sa udelom ispod 0,5%. Utvrđeno je da se mikrostruktura prevlake uglavnom sastoji od lamelarne strukture i stubastih kristalnih zrna Mo. Ispitivanja su pokazala da VPS - Mo slojevi prevlake imaju mehaničke karakteristike i mikrostrukturu koje u potpunosti omogućavaju primenu prevlake na površinama delova od kojih se zahteva da imaju dobra klizna svojstva, otpornost na habanje i koroziju.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process, Mehanička svojstva i mikrostruktura slojeva prevlake molibdena deponovane vakuum plazma sprej procesom",
pages = "276-271",
number = "3",
volume = "60",
doi = "10.5937/zasmat1903271M"
}

Mrdak, M., Lačnjevac, Č., Rakin, M., Veljić, D.,& Bajić, N.. (2019). Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(3), 271-276.
https://doi.org/10.5937/zasmat1903271M

Mrdak M, Lačnjevac Č, Rakin M, Veljić D, Bajić N. Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process. in Zaštita materijala. 2019;60(3):271-276.
doi:10.5937/zasmat1903271M .

Mrdak, Mihailo, Lačnjevac, Časlav, Rakin, Marko, Veljić, Darko, Bajić, Nikola, "Mechanical properties and microstructure of molybdenum coating layers deposited vacuum plasma spray process" in Zaštita materijala, 60, no. 3 (2019):271-276,
https://doi.org/10.5937/zasmat1903271M . .

TY  - JOUR
AU  - Musrati, Walid
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Stefane, Primoz
AU  - Veljić, Darko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3796
AB  - Application of pipelines is common in process industry and energetic facilities, as parts of storage and transport systems. Structural integrity and fracture resistance of the pipeline elements is typically assessed by testing fracture mechanics specimens, like compact tensile CT or single-edge notched bending, SENB. However, fabrication of these geometries is often not possible for thin-walled pressurized elements, commonly used in structures of process and energetic facilities. Therefore, some proposals for non-standard specimens have been given in the literature, differing by the position of the initial defects, in circumferential or axial direction, and by the degree of complexity of procedures for fabrication and testing. Recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend) is used here to assess the fracture resistance of pressurized cylinders with defects in axial direction, critical for the internal pressure loading. The specimens are simple to fabricate and have the same material history as the actual structure, such as thermo-mechanical treatment, assembly or exploitation conditions. In this work, the ring specimens are cut from the thin-walled non-alloy steel pipes for pressure purposes. Experimental-numerical procedure is applied for prediction of fracture behavior. The methods include material characterization, fracture testing and micromechanical analysis of specimen failure. The results obtained so far lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of pipelines and small-scale vessels.
PB  - Elsevier Science Bv, Amsterdam
T2  - ECF22 - Loading and Environmental Effects on Structural Integrity
T1  - Fracture analysis of axially flawed ring-shaped bending specimen
EP  - 1833
SP  - 1828
VL  - 13
DO  - 10.1016/j.prostr.2018.12.333
ER  - 

@article{
author = "Musrati, Walid and Međo, Bojan and Gubeljak, Nenad and Stefane, Primoz and Veljić, Darko and Sedmak, Aleksandar and Rakin, Marko",
year = "2018",
abstract = "Application of pipelines is common in process industry and energetic facilities, as parts of storage and transport systems. Structural integrity and fracture resistance of the pipeline elements is typically assessed by testing fracture mechanics specimens, like compact tensile CT or single-edge notched bending, SENB. However, fabrication of these geometries is often not possible for thin-walled pressurized elements, commonly used in structures of process and energetic facilities. Therefore, some proposals for non-standard specimens have been given in the literature, differing by the position of the initial defects, in circumferential or axial direction, and by the degree of complexity of procedures for fabrication and testing. Recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend) is used here to assess the fracture resistance of pressurized cylinders with defects in axial direction, critical for the internal pressure loading. The specimens are simple to fabricate and have the same material history as the actual structure, such as thermo-mechanical treatment, assembly or exploitation conditions. In this work, the ring specimens are cut from the thin-walled non-alloy steel pipes for pressure purposes. Experimental-numerical procedure is applied for prediction of fracture behavior. The methods include material characterization, fracture testing and micromechanical analysis of specimen failure. The results obtained so far lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of pipelines and small-scale vessels.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "ECF22 - Loading and Environmental Effects on Structural Integrity",
title = "Fracture analysis of axially flawed ring-shaped bending specimen",
pages = "1833-1828",
volume = "13",
doi = "10.1016/j.prostr.2018.12.333"
}

Musrati, W., Međo, B., Gubeljak, N., Stefane, P., Veljić, D., Sedmak, A.,& Rakin, M.. (2018). Fracture analysis of axially flawed ring-shaped bending specimen. in ECF22 - Loading and Environmental Effects on Structural Integrity
Elsevier Science Bv, Amsterdam., 13, 1828-1833.
https://doi.org/10.1016/j.prostr.2018.12.333

Musrati W, Međo B, Gubeljak N, Stefane P, Veljić D, Sedmak A, Rakin M. Fracture analysis of axially flawed ring-shaped bending specimen. in ECF22 - Loading and Environmental Effects on Structural Integrity. 2018;13:1828-1833.
doi:10.1016/j.prostr.2018.12.333 .

Musrati, Walid, Međo, Bojan, Gubeljak, Nenad, Stefane, Primoz, Veljić, Darko, Sedmak, Aleksandar, Rakin, Marko, "Fracture analysis of axially flawed ring-shaped bending specimen" in ECF22 - Loading and Environmental Effects on Structural Integrity, 13 (2018):1828-1833,
https://doi.org/10.1016/j.prostr.2018.12.333 . .

TY  - JOUR
AU  - Murariu, Alin
AU  - Veljić, Darko
AU  - Barjaktarević, Dragana
AU  - Rakin, Marko
AU  - Radović, Nenad
AU  - Sedmak, Aleksandar
AU  - Đoković, Jelena M.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3303
AB  - The heat generated during friction stir welding process depends on plastic deformation of the material and friction between the tool and the material. In this work, heat generation is analysed with respect to the material velocity around the tool in Al alloy Al2024-T351 plate. The slip rate of the tool relative to the workpiece material is related to the frictional heat generated. The material velocity, on the other hand, is related to the heat generated by plastic deformation. During the welding process, the slippage is the most pronounced on the front part of the tool shoulder. Also, it is higher on the retreating side than on the advancing side. Slip rate in the zone around the tool pin has very low values, almost negligible. In this zone, the heat generation from friction is very low, because the material is in paste-like state and subjected to intensive plastic deformation. The material flow velocity around the pin is higher in the zone around the root of the pin. In the radial direction, this quantity increases from the pin to the periphery of the tool shoulder.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Influence of material velocity on heat generation during linear welding stage of friction stir welding
EP  - 1701
IS  - 5
SP  - 1693
VL  - 20
DO  - 10.2298/TSCI150904217M
ER  - 

@article{
author = "Murariu, Alin and Veljić, Darko and Barjaktarević, Dragana and Rakin, Marko and Radović, Nenad and Sedmak, Aleksandar and Đoković, Jelena M.",
year = "2016",
abstract = "The heat generated during friction stir welding process depends on plastic deformation of the material and friction between the tool and the material. In this work, heat generation is analysed with respect to the material velocity around the tool in Al alloy Al2024-T351 plate. The slip rate of the tool relative to the workpiece material is related to the frictional heat generated. The material velocity, on the other hand, is related to the heat generated by plastic deformation. During the welding process, the slippage is the most pronounced on the front part of the tool shoulder. Also, it is higher on the retreating side than on the advancing side. Slip rate in the zone around the tool pin has very low values, almost negligible. In this zone, the heat generation from friction is very low, because the material is in paste-like state and subjected to intensive plastic deformation. The material flow velocity around the pin is higher in the zone around the root of the pin. In the radial direction, this quantity increases from the pin to the periphery of the tool shoulder.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Influence of material velocity on heat generation during linear welding stage of friction stir welding",
pages = "1701-1693",
number = "5",
volume = "20",
doi = "10.2298/TSCI150904217M"
}

Murariu, A., Veljić, D., Barjaktarević, D., Rakin, M., Radović, N., Sedmak, A.,& Đoković, J. M.. (2016). Influence of material velocity on heat generation during linear welding stage of friction stir welding. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 20(5), 1693-1701.
https://doi.org/10.2298/TSCI150904217M

Murariu A, Veljić D, Barjaktarević D, Rakin M, Radović N, Sedmak A, Đoković JM. Influence of material velocity on heat generation during linear welding stage of friction stir welding. in Thermal Science. 2016;20(5):1693-1701.
doi:10.2298/TSCI150904217M .

Murariu, Alin, Veljić, Darko, Barjaktarević, Dragana, Rakin, Marko, Radović, Nenad, Sedmak, Aleksandar, Đoković, Jelena M., "Influence of material velocity on heat generation during linear welding stage of friction stir welding" in Thermal Science, 20, no. 5 (2016):1693-1701,
https://doi.org/10.2298/TSCI150904217M . .

TY  - JOUR
AU  - Veljić, Darko
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Radosavljević, Zoran M.
AU  - Bajić, Nikola
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3439
AB  - Temperature, plastic strain and heat generation during the plunge stage of the friction stir welding of high-strength aluminum alloys 2024 T3 and 2024 T351 are considered in this work. The plunging of the tool into the material is done at different rotating speeds. A 3-D finite element model for thermomechanical simulation is developed. It is based on arbitrary Lagrangian-Eulerian formulation, and Johnson-Cook material law is used for modelling of material behaviour. From comparison of the numerical results for alloys 2024 T3 and 2024 T351, it can be seen that the former has more intensive heat generation from the plastic deformation, due to its higher strength. Friction heat generation is only slightly dfferent for the two alloys. Therefore, temperatures in the working plate are higher in the alloy 2024 T3 for the same parameters of the plunge stage. Equivalent plastic strain is higher for 2024 T351 alloy, and the highest values are determined under the tool shoulder and around the tool pin. For the alloy 2024 T3, equivalent plastic strain is the highest in the influence zone of the tool pin.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Analysis of the tool plunge in friction stir welding comparison of aluminum alloys 2024 t3 and 2024 t351
EP  - 254
IS  - 1
SP  - 247
VL  - 20
DO  - 10.2298/TSCI150313059V
ER  - 

@article{
author = "Veljić, Darko and Međo, Bojan and Rakin, Marko and Radosavljević, Zoran M. and Bajić, Nikola",
year = "2016",
abstract = "Temperature, plastic strain and heat generation during the plunge stage of the friction stir welding of high-strength aluminum alloys 2024 T3 and 2024 T351 are considered in this work. The plunging of the tool into the material is done at different rotating speeds. A 3-D finite element model for thermomechanical simulation is developed. It is based on arbitrary Lagrangian-Eulerian formulation, and Johnson-Cook material law is used for modelling of material behaviour. From comparison of the numerical results for alloys 2024 T3 and 2024 T351, it can be seen that the former has more intensive heat generation from the plastic deformation, due to its higher strength. Friction heat generation is only slightly dfferent for the two alloys. Therefore, temperatures in the working plate are higher in the alloy 2024 T3 for the same parameters of the plunge stage. Equivalent plastic strain is higher for 2024 T351 alloy, and the highest values are determined under the tool shoulder and around the tool pin. For the alloy 2024 T3, equivalent plastic strain is the highest in the influence zone of the tool pin.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Analysis of the tool plunge in friction stir welding comparison of aluminum alloys 2024 t3 and 2024 t351",
pages = "254-247",
number = "1",
volume = "20",
doi = "10.2298/TSCI150313059V"
}

Veljić, D., Međo, B., Rakin, M., Radosavljević, Z. M.,& Bajić, N.. (2016). Analysis of the tool plunge in friction stir welding comparison of aluminum alloys 2024 t3 and 2024 t351. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 20(1), 247-254.
https://doi.org/10.2298/TSCI150313059V

Veljić D, Međo B, Rakin M, Radosavljević ZM, Bajić N. Analysis of the tool plunge in friction stir welding comparison of aluminum alloys 2024 t3 and 2024 t351. in Thermal Science. 2016;20(1):247-254.
doi:10.2298/TSCI150313059V .

Veljić, Darko, Međo, Bojan, Rakin, Marko, Radosavljević, Zoran M., Bajić, Nikola, "Analysis of the tool plunge in friction stir welding comparison of aluminum alloys 2024 t3 and 2024 t351" in Thermal Science, 20, no. 1 (2016):247-254,
https://doi.org/10.2298/TSCI150313059V . .

TY  - JOUR
AU  - Veljić, Darko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Radović, Nenad
AU  - Popović, Negica
AU  - Daşcău, Horia
AU  - Bajić, Nikola
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2893
AB  - U savremenoj industrijskoj proizvodnji, svaki proizvodni proces treba da bude ispitan u pogledu uticaja na životnu sredinu. Za svaku kompaniju koja investira u novi proces je od značaja pažljivo razmatranje HSE (Health, Safety and Environment) problema na radnom mestu. Zavarivanje trenjem sa mešanjem nudi brojne prednosti u pogledu zaštite zdravlja, životne sredine i bezbednosti na radu u odnosu na druge procese zavarivanja zasnovane na primeni električnog luka. Elektrolučno zavarivanje proizvodi čitav spek-tar ultraljubičastog zra čenja koje je štetno po čovekovo zdravlje, pre svega oči i kožu. Izlaganje ovom zračenju bez adekvatne zaštite može dovesti do ozbiljnih povreda. Ukoliko se ne koriste odgovarajuće mere zaštite, zavarivač vrlo lako može dobiti opekotine. Ovo je naročito izraženo kod elektrolučnog zavarivanja aluminijuma, gde je zbog velike provodljivosti materijala potrebno koristiti električni luk veće energije i čija površina ima veću refleksiju od čelika. Ovaj rad govori o FSW procesu zavarivanja i njegovim prednostima u odnosu na elektrolu čne postupke zavarivanja, sa posebnim osvrtom na zaštitu zdravlja, životne sredine i bezbednosti na radu.
AB  - In modern industrial production, every manufacturing and assembly process should be assessed with respect to its influence on the environment. For a company that invests in a new process, a careful analysis of HSE problems (Health, Safety and Environment) is very important. Friction stir welding (FSW) process offers numerous advantages regarding health protection, environmental effects and work safety in comparison with other welding procedures, such as arc welding. Arc welding produces a broad spec-trum of UV radiation, harmful for human health (skin, eyes). Exposure to this radiation without an adequate protection can lead to severe injuries. If appropriate protective measures are undertaken, the welder can easily be exposed to heat injuries. This is especially pronounced for arc welding of aluminium alloys, because high material conductivity of Al requires a high-energy arc, and also because its surface has more pronounced reflection than steel. This work deals with the FSW welding process and its advantages in comparison with arc welding processes with respect to health protection, environmental problems and work safety.
PB  - Society for Structural Integrity and Life (DIVK)
T2  - Structural Integrity and Life
T1  - Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu
T1  - Advantages of friction stir welding over arc welding with respect to health and environmental protection and work safety
EP  - 116
IS  - 2
SP  - 111
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2893
ER  - 

@article{
author = "Veljić, Darko and Sedmak, Aleksandar and Rakin, Marko and Radović, Nenad and Popović, Negica and Daşcău, Horia and Bajić, Nikola",
year = "2015",
abstract = "U savremenoj industrijskoj proizvodnji, svaki proizvodni proces treba da bude ispitan u pogledu uticaja na životnu sredinu. Za svaku kompaniju koja investira u novi proces je od značaja pažljivo razmatranje HSE (Health, Safety and Environment) problema na radnom mestu. Zavarivanje trenjem sa mešanjem nudi brojne prednosti u pogledu zaštite zdravlja, životne sredine i bezbednosti na radu u odnosu na druge procese zavarivanja zasnovane na primeni električnog luka. Elektrolučno zavarivanje proizvodi čitav spek-tar ultraljubičastog zra čenja koje je štetno po čovekovo zdravlje, pre svega oči i kožu. Izlaganje ovom zračenju bez adekvatne zaštite može dovesti do ozbiljnih povreda. Ukoliko se ne koriste odgovarajuće mere zaštite, zavarivač vrlo lako može dobiti opekotine. Ovo je naročito izraženo kod elektrolučnog zavarivanja aluminijuma, gde je zbog velike provodljivosti materijala potrebno koristiti električni luk veće energije i čija površina ima veću refleksiju od čelika. Ovaj rad govori o FSW procesu zavarivanja i njegovim prednostima u odnosu na elektrolu čne postupke zavarivanja, sa posebnim osvrtom na zaštitu zdravlja, životne sredine i bezbednosti na radu., In modern industrial production, every manufacturing and assembly process should be assessed with respect to its influence on the environment. For a company that invests in a new process, a careful analysis of HSE problems (Health, Safety and Environment) is very important. Friction stir welding (FSW) process offers numerous advantages regarding health protection, environmental effects and work safety in comparison with other welding procedures, such as arc welding. Arc welding produces a broad spec-trum of UV radiation, harmful for human health (skin, eyes). Exposure to this radiation without an adequate protection can lead to severe injuries. If appropriate protective measures are undertaken, the welder can easily be exposed to heat injuries. This is especially pronounced for arc welding of aluminium alloys, because high material conductivity of Al requires a high-energy arc, and also because its surface has more pronounced reflection than steel. This work deals with the FSW welding process and its advantages in comparison with arc welding processes with respect to health protection, environmental problems and work safety.",
publisher = "Society for Structural Integrity and Life (DIVK)",
journal = "Structural Integrity and Life",
title = "Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu, Advantages of friction stir welding over arc welding with respect to health and environmental protection and work safety",
pages = "116-111",
number = "2",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2893"
}

Veljić, D., Sedmak, A., Rakin, M., Radović, N., Popović, N., Daşcău, H.,& Bajić, N.. (2015). Prednosti zavarivanja trenjem sa mešanjem u odnosu na elektrolučno zavarivanje - zaštita zdravlja i životne sredine i bezbednost na radu. in Structural Integrity and Life
Society for Structural Integrity and Life (DIVK)., 15(2), 111-116.
https://hdl.handle.net/21.15107/rcub_technorep_2893

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