TY  - JOUR
AU  - Marković, Svetislav
AU  - Milović, Ljubica
AU  - Vrhovac, Miran
AU  - Lazović, Tatjana
AU  - Marinković, Aleksandar
AU  - Aleksić, Vujadin
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2272
AB  - This paper contains the results of experimental analysis of fatigue endurance of used steel teeth regenerated by hard facing. The cylindrical spur gears were tested and compared with the newly made ones, oiler being regenerated by hard facing with subsequent cementation and quenching. The fatigue testing wider variable amplitude loading was used to determine the duration of operational life through measurement of wear. The obtained results demonstrated the impact of hard facing methods on gear endurance in operation. In the test on regenerated gears it was discovered that initial pits appeared almost simultaneously for different facing materials and a bit earlier than in tests on newly made ones, despite their considerably higher pitting rate. Apart from that, the tested operational lives of regenerated and newly-made gears were approximately equal and much longer than predicted.
PB  - Editura Stiintifica Fmr, Bucharest
T2  - Metalurgia International
T1  - Life extension of gears flank surfaces regenerated by hard facing
EP  - 85
IS  - 2
SP  - 81
VL  - 18
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2272
ER  - 

@article{
author = "Marković, Svetislav and Milović, Ljubica and Vrhovac, Miran and Lazović, Tatjana and Marinković, Aleksandar and Aleksić, Vujadin",
year = "2013",
abstract = "This paper contains the results of experimental analysis of fatigue endurance of used steel teeth regenerated by hard facing. The cylindrical spur gears were tested and compared with the newly made ones, oiler being regenerated by hard facing with subsequent cementation and quenching. The fatigue testing wider variable amplitude loading was used to determine the duration of operational life through measurement of wear. The obtained results demonstrated the impact of hard facing methods on gear endurance in operation. In the test on regenerated gears it was discovered that initial pits appeared almost simultaneously for different facing materials and a bit earlier than in tests on newly made ones, despite their considerably higher pitting rate. Apart from that, the tested operational lives of regenerated and newly-made gears were approximately equal and much longer than predicted.",
publisher = "Editura Stiintifica Fmr, Bucharest",
journal = "Metalurgia International",
title = "Life extension of gears flank surfaces regenerated by hard facing",
pages = "85-81",
number = "2",
volume = "18",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2272"
}

Marković, S., Milović, L., Vrhovac, M., Lazović, T., Marinković, A.,& Aleksić, V.. (2013). Life extension of gears flank surfaces regenerated by hard facing. in Metalurgia International
Editura Stiintifica Fmr, Bucharest., 18(2), 81-85.
https://hdl.handle.net/21.15107/rcub_technorep_2272

Marković S, Milović L, Vrhovac M, Lazović T, Marinković A, Aleksić V. Life extension of gears flank surfaces regenerated by hard facing. in Metalurgia International. 2013;18(2):81-85.
https://hdl.handle.net/21.15107/rcub_technorep_2272 .

Marković, Svetislav, Milović, Ljubica, Vrhovac, Miran, Lazović, Tatjana, Marinković, Aleksandar, Aleksić, Vujadin, "Life extension of gears flank surfaces regenerated by hard facing" in Metalurgia International, 18, no. 2 (2013):81-85,
https://hdl.handle.net/21.15107/rcub_technorep_2272 .

TY  - JOUR
AU  - Milović, Ljubica
AU  - Vuherer, T.
AU  - Blačić, Ivo
AU  - Vrhovac, Miran
AU  - Stanković, M.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2476
AB  - The subject of this paper is the microstructural and mechanical characterisation of regions of the heat-affected zone (HAZ) in steels containing 9-12% Cr that are used for operation at elevated temperatures. Tests were performed on regions in the HAZ, which was created by physical simulation using a thermal welding simulator. Half of the simulated samples (SSs) were tested at room temperature (RT) and at an operating temperature (OT) of 600 degrees C immediately after simulation/welding, while the rest of the simulated samples were tested at RT and at the OT after heat treatment following the welding, i.e., post-weld heat treatment (PWHT). In addition to the results from mechanical testing, the results from microstructural analysis using light microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are also presented. The manner in which PWHT contributes to the creep resistance of the HAZ in P91 steel is demonstrated.
PB  - Elsevier Sci Ltd, Oxford
T2  - Materials & Design
T1  - Microstructures and mechanical properties of creep resistant steel for application at elevated temperatures
EP  - 667
SP  - 660
VL  - 46
DO  - 10.1016/j.matdes.2012.10.057
ER  - 

@article{
author = "Milović, Ljubica and Vuherer, T. and Blačić, Ivo and Vrhovac, Miran and Stanković, M.",
year = "2013",
abstract = "The subject of this paper is the microstructural and mechanical characterisation of regions of the heat-affected zone (HAZ) in steels containing 9-12% Cr that are used for operation at elevated temperatures. Tests were performed on regions in the HAZ, which was created by physical simulation using a thermal welding simulator. Half of the simulated samples (SSs) were tested at room temperature (RT) and at an operating temperature (OT) of 600 degrees C immediately after simulation/welding, while the rest of the simulated samples were tested at RT and at the OT after heat treatment following the welding, i.e., post-weld heat treatment (PWHT). In addition to the results from mechanical testing, the results from microstructural analysis using light microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are also presented. The manner in which PWHT contributes to the creep resistance of the HAZ in P91 steel is demonstrated.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Materials & Design",
title = "Microstructures and mechanical properties of creep resistant steel for application at elevated temperatures",
pages = "667-660",
volume = "46",
doi = "10.1016/j.matdes.2012.10.057"
}

Milović, L., Vuherer, T., Blačić, I., Vrhovac, M.,& Stanković, M.. (2013). Microstructures and mechanical properties of creep resistant steel for application at elevated temperatures. in Materials & Design
Elsevier Sci Ltd, Oxford., 46, 660-667.
https://doi.org/10.1016/j.matdes.2012.10.057

Milović L, Vuherer T, Blačić I, Vrhovac M, Stanković M. Microstructures and mechanical properties of creep resistant steel for application at elevated temperatures. in Materials & Design. 2013;46:660-667.
doi:10.1016/j.matdes.2012.10.057 .

Milović, Ljubica, Vuherer, T., Blačić, Ivo, Vrhovac, Miran, Stanković, M., "Microstructures and mechanical properties of creep resistant steel for application at elevated temperatures" in Materials & Design, 46 (2013):660-667,
https://doi.org/10.1016/j.matdes.2012.10.057 . .

TY  - JOUR
AU  - Vrhovac, Miran
AU  - Milović, Ljubica
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1404
AB  - The paper sets up the combined criteria for creep crack growth (CCG) assessment. The CCG model considering influence of creep damage on mechanics of fracture correlates the crack growth rate, damage factor and damage factor rate. Thus, the combined approach of fracture and damage mechanics was applied. The proposed model has been analyzed through the testing of CCG in two different notched specimens, CS25 and D9, made from DIN X22 CrMoV 12 1 steel. The experimentally obtained creep crack growth was used for detailed numerical simulation of the tests aimed for determination of damage factor time distribution during the CCG. The total damage factor used in analysis was defined as a relation between the plastic strain energy and total mechanical energy of the specimen. It was compared to the experimentally derived damage factor of Kachanow. The mathematical description of crack growth rate dependence on damage factor and damage factor rate, including the factors of transposing the test results to real component behaviour were determined for the CCG rate fraction due to secondary and tertiary creep as well as total CCG rate. The combined model is applicable to CCG simulations in welded joints with creep damage distributed at the ligament ahead of crack tip.
AB  - U radu su prikazane postavke kombinovanog kriterijuma mehanike loma i mehanike materijala za razvoj prsline u uslovima puzanja (RPP). Predloženi model uzima u obzir uticaj prostorne raspodele oštećenja u zoni prsline na mehaniku loma materijala, korelišući brzinu razvoja prsline, stepen i brzinu razvoja oštećenja materijala u vremenu. Model je analiziran ispitivanjem razaranjem u uslovima puzanja epruveta sa zarezom CS25 i D9, napravljenih od čelika DIN X22 CrMoV 12 1. Eksperimentalno dobijena vrednost brzine razvoja prsline je korišćena za detaljnu numeričku simulaciju tog ispitivanja radi određivanja vremenske raspodele odgovarajućeg stepena oštećenja materijala. Ukupni stepen oštećenja određen kao odnos energije plastične deformacije i ukupne mehaničke energije utrošenih tokom ispitivanja epruveta, upoređen je sa eksperimentalno određenim faktorom oštećenja Kačanova. Matematički opis zavisnosti brzine razvoja prsline od stepena oštećenja i brzine njegovog razvoja u uslovima puzanja, uključujući i faktore preslikavanja rezultata eksperimentalnog ispitivanja RPP i njegove numeričke simulacije na realne industrijske komponente, određeni su za ukupni razvoj prsline kao i njegov udeo od sekundarnog i tercijarnog režima puzanja. Predloženi kombinovani model je primenljiv na numeričke simulacije RPP u zavarenim spojevima sa prostorno raspodeljenim oštećenjem materijala u zoni prsline.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Setup of combined creep crack growth model
T1  - Postavke kombinovanog modela razvoja prsline u uslovima puzanja
EP  - 140
IS  - 4
SP  - 131
VL  - 54
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1404
ER  - 

@article{
author = "Vrhovac, Miran and Milović, Ljubica",
year = "2009",
abstract = "The paper sets up the combined criteria for creep crack growth (CCG) assessment. The CCG model considering influence of creep damage on mechanics of fracture correlates the crack growth rate, damage factor and damage factor rate. Thus, the combined approach of fracture and damage mechanics was applied. The proposed model has been analyzed through the testing of CCG in two different notched specimens, CS25 and D9, made from DIN X22 CrMoV 12 1 steel. The experimentally obtained creep crack growth was used for detailed numerical simulation of the tests aimed for determination of damage factor time distribution during the CCG. The total damage factor used in analysis was defined as a relation between the plastic strain energy and total mechanical energy of the specimen. It was compared to the experimentally derived damage factor of Kachanow. The mathematical description of crack growth rate dependence on damage factor and damage factor rate, including the factors of transposing the test results to real component behaviour were determined for the CCG rate fraction due to secondary and tertiary creep as well as total CCG rate. The combined model is applicable to CCG simulations in welded joints with creep damage distributed at the ligament ahead of crack tip., U radu su prikazane postavke kombinovanog kriterijuma mehanike loma i mehanike materijala za razvoj prsline u uslovima puzanja (RPP). Predloženi model uzima u obzir uticaj prostorne raspodele oštećenja u zoni prsline na mehaniku loma materijala, korelišući brzinu razvoja prsline, stepen i brzinu razvoja oštećenja materijala u vremenu. Model je analiziran ispitivanjem razaranjem u uslovima puzanja epruveta sa zarezom CS25 i D9, napravljenih od čelika DIN X22 CrMoV 12 1. Eksperimentalno dobijena vrednost brzine razvoja prsline je korišćena za detaljnu numeričku simulaciju tog ispitivanja radi određivanja vremenske raspodele odgovarajućeg stepena oštećenja materijala. Ukupni stepen oštećenja određen kao odnos energije plastične deformacije i ukupne mehaničke energije utrošenih tokom ispitivanja epruveta, upoređen je sa eksperimentalno određenim faktorom oštećenja Kačanova. Matematički opis zavisnosti brzine razvoja prsline od stepena oštećenja i brzine njegovog razvoja u uslovima puzanja, uključujući i faktore preslikavanja rezultata eksperimentalnog ispitivanja RPP i njegove numeričke simulacije na realne industrijske komponente, određeni su za ukupni razvoj prsline kao i njegov udeo od sekundarnog i tercijarnog režima puzanja. Predloženi kombinovani model je primenljiv na numeričke simulacije RPP u zavarenim spojevima sa prostorno raspodeljenim oštećenjem materijala u zoni prsline.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Setup of combined creep crack growth model, Postavke kombinovanog modela razvoja prsline u uslovima puzanja",
pages = "140-131",
number = "4",
volume = "54",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1404"
}

Vrhovac, M.,& Milović, L.. (2009). Setup of combined creep crack growth model. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 54(4), 131-140.
https://hdl.handle.net/21.15107/rcub_technorep_1404

Vrhovac M, Milović L. Setup of combined creep crack growth model. in Zavarivanje i zavarene konstrukcije. 2009;54(4):131-140.
https://hdl.handle.net/21.15107/rcub_technorep_1404 .

Vrhovac, Miran, Milović, Ljubica, "Setup of combined creep crack growth model" in Zavarivanje i zavarene konstrukcije, 54, no. 4 (2009):131-140,
https://hdl.handle.net/21.15107/rcub_technorep_1404 .