TY  - JOUR
AU  - Glišić, Dragomir
AU  - Radović, Nenad
AU  - Drobnjak, Đorđe
AU  - Fadel, Abdunnaser
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3682
AB  - Medium carbon V-microalloyed steel continuously cooled from the austenitization temperature at still air, with predominantly acicular ferrite structure, has been investigated by means of four-point bending of notched Griffiths-Owens's type specimens at liquid nitrogen temperature. Local fracture stress and plastic strain were determined by using finite element analysis and fracture surface examination using scanning electron microscope. It was revealed that cleavage fracture initiation, which takes place close to the notch root in the narrow zone of high plastic strains, is not related to any broken coarse second phase particles. It was assumed that microcracks nucleate by strain induced fracture of pearlite nodules. Two effective surface energy values of 24 and 42 J/m(2) were estimated according to the Griffith's equation, indicating the influence of crystallographic orientation between neighboring grains at the origin of fracture. Lower value was attributed to fracture of coarse ferrite-pearlite units with similar crystallographic orientation and higher value to fracture propagation through fine acicular ferrite matrix.
PB  - Springer-Verlag Berlin, Berlin
T2  - Fracture At All Scales
T1  - Cleavage Fracture in Continuously Cooled V-Microalloyed Medium Carbon Steel
EP  - 219
SP  - 209
DO  - 10.1007/978-3-319-32634-4_11
ER  - 

@article{
author = "Glišić, Dragomir and Radović, Nenad and Drobnjak, Đorđe and Fadel, Abdunnaser",
year = "2017",
abstract = "Medium carbon V-microalloyed steel continuously cooled from the austenitization temperature at still air, with predominantly acicular ferrite structure, has been investigated by means of four-point bending of notched Griffiths-Owens's type specimens at liquid nitrogen temperature. Local fracture stress and plastic strain were determined by using finite element analysis and fracture surface examination using scanning electron microscope. It was revealed that cleavage fracture initiation, which takes place close to the notch root in the narrow zone of high plastic strains, is not related to any broken coarse second phase particles. It was assumed that microcracks nucleate by strain induced fracture of pearlite nodules. Two effective surface energy values of 24 and 42 J/m(2) were estimated according to the Griffith's equation, indicating the influence of crystallographic orientation between neighboring grains at the origin of fracture. Lower value was attributed to fracture of coarse ferrite-pearlite units with similar crystallographic orientation and higher value to fracture propagation through fine acicular ferrite matrix.",
publisher = "Springer-Verlag Berlin, Berlin",
journal = "Fracture At All Scales",
title = "Cleavage Fracture in Continuously Cooled V-Microalloyed Medium Carbon Steel",
pages = "219-209",
doi = "10.1007/978-3-319-32634-4_11"
}

Glišić, D., Radović, N., Drobnjak, Đ.,& Fadel, A.. (2017). Cleavage Fracture in Continuously Cooled V-Microalloyed Medium Carbon Steel. in Fracture At All Scales
Springer-Verlag Berlin, Berlin., 209-219.
https://doi.org/10.1007/978-3-319-32634-4_11

Glišić D, Radović N, Drobnjak Đ, Fadel A. Cleavage Fracture in Continuously Cooled V-Microalloyed Medium Carbon Steel. in Fracture At All Scales. 2017;:209-219.
doi:10.1007/978-3-319-32634-4_11 .

Glišić, Dragomir, Radović, Nenad, Drobnjak, Đorđe, Fadel, Abdunnaser, "Cleavage Fracture in Continuously Cooled V-Microalloyed Medium Carbon Steel" in Fracture At All Scales (2017):209-219,
https://doi.org/10.1007/978-3-319-32634-4_11 . .

TY  - JOUR
AU  - Glišić, Dragomir
AU  - Radović, Nenad
AU  - Drobnjak, Đorđe
AU  - Fadel, Abdunnaser
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2799
AB  - Cleavage fracture of the medium carbon V-microalloyed steel with structure consisting of acicular ferrite, pearlite and grain boundary ferrite has been investigated by means of four-point bending of the notched samples at -196 degrees C. It was found that cleavage fracture initiation has not been related to the coarse second phase particles cracking. Calculated values of the effective surface energy of 49 J/m(2) and critical cleavage fracture stress normalized by yield stress of 1.84 are in agreement with the results for the steels with ferrite-pearlite and bainite structures.
PB  - Elsevier Science Bv, Amsterdam
T2  - 20th European Conference on Fracture
T1  - Critical stress for cleavage fracture in continuously cooled medium carbon V-microalloyed steel
EP  - 1231
SP  - 1226
VL  - 3
DO  - 10.1016/j.mspro.2014.06.199
ER  - 

@article{
author = "Glišić, Dragomir and Radović, Nenad and Drobnjak, Đorđe and Fadel, Abdunnaser",
year = "2014",
abstract = "Cleavage fracture of the medium carbon V-microalloyed steel with structure consisting of acicular ferrite, pearlite and grain boundary ferrite has been investigated by means of four-point bending of the notched samples at -196 degrees C. It was found that cleavage fracture initiation has not been related to the coarse second phase particles cracking. Calculated values of the effective surface energy of 49 J/m(2) and critical cleavage fracture stress normalized by yield stress of 1.84 are in agreement with the results for the steels with ferrite-pearlite and bainite structures.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "20th European Conference on Fracture",
title = "Critical stress for cleavage fracture in continuously cooled medium carbon V-microalloyed steel",
pages = "1231-1226",
volume = "3",
doi = "10.1016/j.mspro.2014.06.199"
}

Glišić, D., Radović, N., Drobnjak, Đ.,& Fadel, A.. (2014). Critical stress for cleavage fracture in continuously cooled medium carbon V-microalloyed steel. in 20th European Conference on Fracture
Elsevier Science Bv, Amsterdam., 3, 1226-1231.
https://doi.org/10.1016/j.mspro.2014.06.199

Glišić D, Radović N, Drobnjak Đ, Fadel A. Critical stress for cleavage fracture in continuously cooled medium carbon V-microalloyed steel. in 20th European Conference on Fracture. 2014;3:1226-1231.
doi:10.1016/j.mspro.2014.06.199 .

Glišić, Dragomir, Radović, Nenad, Drobnjak, Đorđe, Fadel, Abdunnaser, "Critical stress for cleavage fracture in continuously cooled medium carbon V-microalloyed steel" in 20th European Conference on Fracture, 3 (2014):1226-1231,
https://doi.org/10.1016/j.mspro.2014.06.199 . .

TY  - JOUR
AU  - Glišić, Dragomir
AU  - Fadel, Abdunnaser
AU  - Radović, Nenad
AU  - Drobnjak, Đorđe
AU  - Zrilić, Milorad
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2338
AB  - The aim of this work was to establish the deformation behavior of two vanadium microalloyed medium carbon steels with different contents of carbon and titanium by tensile testing at 77 K. Samples were reheated at 1250°C for 30 min and continuously cooled in still air. Beside acicular ferrite as the dominant morphology in both microstructures, the steel with lower content of carbon and negligible amount of titanium contains considerable fraction of grain boundary ferrite and pearlite. It was found that Ti-free steel exhibits a higher strain hardening rate and significantly lower elongation at 77 K than the fully acicular ferrite steel. The difference in tensile behavior at 77 K of the two steels has been associated with the influence of the pearlite, together with higher dislocation density of acicular ferrite.
AB  - Čelici mikrolegirani vanadijumom i titanom razvijani su sa ciljem da zamene kaljene i otpuštene srednjeugljenične čelike. Iako ove čelike karakteriše dobra kombinacija čvrstoće i žilavosti, s druge strane zahtevaju naknadnu termičku obradu, koja značajno povećava troškove proizvodnje. Tehnologija dobijanja kontinuirano hlađenih čelika treba da obezbedi mikrostrukturu zahtevanih osobina posle hlađenja na vazduhu. Iz tog razloga je ovim čelicima promenjen sastav, a dobre osobine se obezbeđuju prisustvom acikularnog ferita. Acikularni ferit karakteriše nukleacija unutar prethodnog austenitnog zrna i velika razlika u kristalografskoj orijentaciji pojedinih zrna, odnosno feritnih pločica. Ova isprepletana struktura obezbeđuje povećan otpor kretanju prskotine i žilavost koja je na nivou žilavosti kod tradicionalnih kaljenih i otpuštanih čelika. U radu su ispitivana dva kontinuirano hlađena mikrolegirana čelika sa dodatkom vanadijuma. Struktura čelika bez titana i sa manjim sadržajem ugljenika ('A19') sastoji se od kontinuirane mreže proeutektoidnog ferita uz koji se izdvojio perlit, za kojim sledi acikularni ferit izdvojen unutar nekadašnjeg austenitnog zrna. Struktura čelika sa titanom i većim sadržajem ugljenika ('B22') sastoji se gotovo u potpunosti od acikularnog ferita. Deformaciono ponašanje na 77 K ispitivano je jednoosnim zatezanjem. Ukupno izduženje uzoraka čelika B22 znatno je veće nego kod čelika A19 (10 u odnosu na 5%). Čelik B22 takođe poseduje veću granicu tečenja i zateznu čvrstoću, što je razumljivo s obzirom na veći sadržaj ugljenika. Značajna razlika u duktilnosti na temperaturi tečnog azota u vezi je sa prisustvom perlita kod čelika A19, u odnosu na strukturu acikularnog ferita kod čelika B22. Brzina deformacionog ojačavanja se povećava sa povećanjem udela perlita u strukturi, čime deformacija postaje otežana, dok istovremeno konkurentni proces nastajanja mikroprskotina na krtim cementitnim lamelama ili česticama sekundarnih faza, brzo dovodi do krtog loma na 77 K. S druge strane, acikularni ferit karakteriše povećana gustina dislokacija, što se manifestuje smanjenjem brzine deformacionog ojačavanja, a time i povećanim kapacitetom deformacionog ojačavanja i većim izduženjem kod čelika B22.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Deformation behaviour of two continuously cooled vanadium microalloyed steels at liquid nitrogen temperature
T1  - Deformaciono ponašanje dva kontinuirano hlađena vanadijum mikrolegirana čelika na temperaturi tečnog azota
EP  - 988
IS  - 6
SP  - 981
VL  - 67
DO  - 10.2298/HEMIND121214015G
ER  - 

@article{
author = "Glišić, Dragomir and Fadel, Abdunnaser and Radović, Nenad and Drobnjak, Đorđe and Zrilić, Milorad",
year = "2013",
abstract = "The aim of this work was to establish the deformation behavior of two vanadium microalloyed medium carbon steels with different contents of carbon and titanium by tensile testing at 77 K. Samples were reheated at 1250°C for 30 min and continuously cooled in still air. Beside acicular ferrite as the dominant morphology in both microstructures, the steel with lower content of carbon and negligible amount of titanium contains considerable fraction of grain boundary ferrite and pearlite. It was found that Ti-free steel exhibits a higher strain hardening rate and significantly lower elongation at 77 K than the fully acicular ferrite steel. The difference in tensile behavior at 77 K of the two steels has been associated with the influence of the pearlite, together with higher dislocation density of acicular ferrite., Čelici mikrolegirani vanadijumom i titanom razvijani su sa ciljem da zamene kaljene i otpuštene srednjeugljenične čelike. Iako ove čelike karakteriše dobra kombinacija čvrstoće i žilavosti, s druge strane zahtevaju naknadnu termičku obradu, koja značajno povećava troškove proizvodnje. Tehnologija dobijanja kontinuirano hlađenih čelika treba da obezbedi mikrostrukturu zahtevanih osobina posle hlađenja na vazduhu. Iz tog razloga je ovim čelicima promenjen sastav, a dobre osobine se obezbeđuju prisustvom acikularnog ferita. Acikularni ferit karakteriše nukleacija unutar prethodnog austenitnog zrna i velika razlika u kristalografskoj orijentaciji pojedinih zrna, odnosno feritnih pločica. Ova isprepletana struktura obezbeđuje povećan otpor kretanju prskotine i žilavost koja je na nivou žilavosti kod tradicionalnih kaljenih i otpuštanih čelika. U radu su ispitivana dva kontinuirano hlađena mikrolegirana čelika sa dodatkom vanadijuma. Struktura čelika bez titana i sa manjim sadržajem ugljenika ('A19') sastoji se od kontinuirane mreže proeutektoidnog ferita uz koji se izdvojio perlit, za kojim sledi acikularni ferit izdvojen unutar nekadašnjeg austenitnog zrna. Struktura čelika sa titanom i većim sadržajem ugljenika ('B22') sastoji se gotovo u potpunosti od acikularnog ferita. Deformaciono ponašanje na 77 K ispitivano je jednoosnim zatezanjem. Ukupno izduženje uzoraka čelika B22 znatno je veće nego kod čelika A19 (10 u odnosu na 5%). Čelik B22 takođe poseduje veću granicu tečenja i zateznu čvrstoću, što je razumljivo s obzirom na veći sadržaj ugljenika. Značajna razlika u duktilnosti na temperaturi tečnog azota u vezi je sa prisustvom perlita kod čelika A19, u odnosu na strukturu acikularnog ferita kod čelika B22. Brzina deformacionog ojačavanja se povećava sa povećanjem udela perlita u strukturi, čime deformacija postaje otežana, dok istovremeno konkurentni proces nastajanja mikroprskotina na krtim cementitnim lamelama ili česticama sekundarnih faza, brzo dovodi do krtog loma na 77 K. S druge strane, acikularni ferit karakteriše povećana gustina dislokacija, što se manifestuje smanjenjem brzine deformacionog ojačavanja, a time i povećanim kapacitetom deformacionog ojačavanja i većim izduženjem kod čelika B22.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Deformation behaviour of two continuously cooled vanadium microalloyed steels at liquid nitrogen temperature, Deformaciono ponašanje dva kontinuirano hlađena vanadijum mikrolegirana čelika na temperaturi tečnog azota",
pages = "988-981",
number = "6",
volume = "67",
doi = "10.2298/HEMIND121214015G"
}

Glišić, D., Fadel, A., Radović, N., Drobnjak, Đ.,& Zrilić, M.. (2013). Deformation behaviour of two continuously cooled vanadium microalloyed steels at liquid nitrogen temperature. in Hemijska industrija
Association of Chemical Engineers of Serbia., 67(6), 981-988.
https://doi.org/10.2298/HEMIND121214015G

Glišić D, Fadel A, Radović N, Drobnjak Đ, Zrilić M. Deformation behaviour of two continuously cooled vanadium microalloyed steels at liquid nitrogen temperature. in Hemijska industrija. 2013;67(6):981-988.
doi:10.2298/HEMIND121214015G .

Glišić, Dragomir, Fadel, Abdunnaser, Radović, Nenad, Drobnjak, Đorđe, Zrilić, Milorad, "Deformation behaviour of two continuously cooled vanadium microalloyed steels at liquid nitrogen temperature" in Hemijska industrija, 67, no. 6 (2013):981-988,
https://doi.org/10.2298/HEMIND121214015G . .

TY  - JOUR
AU  - Fadel, Abdunnaser
AU  - Glišić, Dragomir
AU  - Radović, Nenad
AU  - Drobnjak, Đorđe
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2380
AB  - The aim of this work was to determine TTT diagram of medium carbon V-N micro-alloyed steel with emphasis on the development of intragranular ferrite morphologies. The isothermal treatment was carried out at 350, 400, 450, 500, 550 and 600°C. These treatments were interrupted at different times in order to analyze the evolution of the microstructure. Metallographic evaluation was done using optical and scanning electron microscopy (SEM). The results show that at high temperatures (≥ 500°C) polygonal intragranulary nucleated ferrite idiomorphs, combined with grain boundary ferrite and pearlite were produced and followed by an incomplete transformation phenomenon. At intermediate temperatures (450, 500°C) an interloced acicular ferrite (AF) microstructure is produced, and at low temperatures (400, 350°C) the sheave of parallel acicular ferrite plates, similar to bainitic sheaves but intragranularly nucleated were observed. In addition to sheaf type acicular ferrite, the grain boundary nucleated bainitic sheaves are observed.
PB  - University of Belgrade, Technical Faculty, Bor
T2  - Journal of Mining and Metallurgy B: Metallurgy
T1  - Intragranular ferrite morphologies in medium carbon vanadium-micro alloyed steel
EP  - 244
IS  - 3
SP  - 237
VL  - 49
DO  - 10.2298/JMMB120820001F
ER  - 

@article{
author = "Fadel, Abdunnaser and Glišić, Dragomir and Radović, Nenad and Drobnjak, Đorđe",
year = "2013",
abstract = "The aim of this work was to determine TTT diagram of medium carbon V-N micro-alloyed steel with emphasis on the development of intragranular ferrite morphologies. The isothermal treatment was carried out at 350, 400, 450, 500, 550 and 600°C. These treatments were interrupted at different times in order to analyze the evolution of the microstructure. Metallographic evaluation was done using optical and scanning electron microscopy (SEM). The results show that at high temperatures (≥ 500°C) polygonal intragranulary nucleated ferrite idiomorphs, combined with grain boundary ferrite and pearlite were produced and followed by an incomplete transformation phenomenon. At intermediate temperatures (450, 500°C) an interloced acicular ferrite (AF) microstructure is produced, and at low temperatures (400, 350°C) the sheave of parallel acicular ferrite plates, similar to bainitic sheaves but intragranularly nucleated were observed. In addition to sheaf type acicular ferrite, the grain boundary nucleated bainitic sheaves are observed.",
publisher = "University of Belgrade, Technical Faculty, Bor",
journal = "Journal of Mining and Metallurgy B: Metallurgy",
title = "Intragranular ferrite morphologies in medium carbon vanadium-micro alloyed steel",
pages = "244-237",
number = "3",
volume = "49",
doi = "10.2298/JMMB120820001F"
}

Fadel, A., Glišić, D., Radović, N.,& Drobnjak, Đ.. (2013). Intragranular ferrite morphologies in medium carbon vanadium-micro alloyed steel. in Journal of Mining and Metallurgy B: Metallurgy
University of Belgrade, Technical Faculty, Bor., 49(3), 237-244.
https://doi.org/10.2298/JMMB120820001F

Fadel A, Glišić D, Radović N, Drobnjak Đ. Intragranular ferrite morphologies in medium carbon vanadium-micro alloyed steel. in Journal of Mining and Metallurgy B: Metallurgy. 2013;49(3):237-244.
doi:10.2298/JMMB120820001F .

Fadel, Abdunnaser, Glišić, Dragomir, Radović, Nenad, Drobnjak, Đorđe, "Intragranular ferrite morphologies in medium carbon vanadium-micro alloyed steel" in Journal of Mining and Metallurgy B: Metallurgy, 49, no. 3 (2013):237-244,
https://doi.org/10.2298/JMMB120820001F . .

TY  - JOUR
AU  - Fadel, Abdunnaser
AU  - Glišić, Dragomir
AU  - Radović, Nenad
AU  - Drobnjak, Đorđe
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2154
AB  - The effect of austenitizing temperature and Cr, Mo and Mn addition on microstructure and mechanical properties of V microalloyed medium carbon steel has been studied by means of metallography and mechanical testing. The addition of Cr, Mn and Mo leads to a decrease in yield strength (YS) by approximate 100 MPa in comparison to the base steel. It is assumed that Mn and Mo increase hardenability by promoting the formation of bainitic sheaves (BS), i.e. by suppressing the formation of ferrite-pearlite and acicular ferrite (FP-AF). Cr at the level used in this work is not that effective. Presence and packet size of bainitic sheaves decrease the Charpy V-notch impact energy at 20 degrees C (CVN20) in comparison to ferrite-pearlite and acicular ferrite microstructures.
PB  - Journal Mater Sci Technol, Shenyang
T2  - Journal of Materials Science & Technology
T1  - Influence of Cr, Mn and Mo Addition on Structure and Properties of V Microalloyed Medium Carbon Steels
EP  - 1058
IS  - 11
SP  - 1053
VL  - 28
DO  - 10.1016/S1005-0302(12)60172-8
ER  - 

@article{
author = "Fadel, Abdunnaser and Glišić, Dragomir and Radović, Nenad and Drobnjak, Đorđe",
year = "2012",
abstract = "The effect of austenitizing temperature and Cr, Mo and Mn addition on microstructure and mechanical properties of V microalloyed medium carbon steel has been studied by means of metallography and mechanical testing. The addition of Cr, Mn and Mo leads to a decrease in yield strength (YS) by approximate 100 MPa in comparison to the base steel. It is assumed that Mn and Mo increase hardenability by promoting the formation of bainitic sheaves (BS), i.e. by suppressing the formation of ferrite-pearlite and acicular ferrite (FP-AF). Cr at the level used in this work is not that effective. Presence and packet size of bainitic sheaves decrease the Charpy V-notch impact energy at 20 degrees C (CVN20) in comparison to ferrite-pearlite and acicular ferrite microstructures.",
publisher = "Journal Mater Sci Technol, Shenyang",
journal = "Journal of Materials Science & Technology",
title = "Influence of Cr, Mn and Mo Addition on Structure and Properties of V Microalloyed Medium Carbon Steels",
pages = "1058-1053",
number = "11",
volume = "28",
doi = "10.1016/S1005-0302(12)60172-8"
}

Fadel, A., Glišić, D., Radović, N.,& Drobnjak, Đ.. (2012). Influence of Cr, Mn and Mo Addition on Structure and Properties of V Microalloyed Medium Carbon Steels. in Journal of Materials Science & Technology
Journal Mater Sci Technol, Shenyang., 28(11), 1053-1058.
https://doi.org/10.1016/S1005-0302(12)60172-8

Fadel A, Glišić D, Radović N, Drobnjak Đ. Influence of Cr, Mn and Mo Addition on Structure and Properties of V Microalloyed Medium Carbon Steels. in Journal of Materials Science & Technology. 2012;28(11):1053-1058.
doi:10.1016/S1005-0302(12)60172-8 .

Fadel, Abdunnaser, Glišić, Dragomir, Radović, Nenad, Drobnjak, Đorđe, "Influence of Cr, Mn and Mo Addition on Structure and Properties of V Microalloyed Medium Carbon Steels" in Journal of Materials Science & Technology, 28, no. 11 (2012):1053-1058,
https://doi.org/10.1016/S1005-0302(12)60172-8 . .

TY  - CONF
AU  - Radović, Nenad
AU  - Koprivica, Ankica
AU  - Glišić, Dragomir
AU  - Fadel, Abdunnaser
AU  - Drobnjak, Đorđe
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1635
AB  - The influence of vanadium and nitrogen on microstructure and mechanical properties of medium-carbon steels has been studied by means of metallography and mechanical testing. Vanadium addition to the low nitrogen steel suppresses the formation of ferrite-pearlite following the low reheating temperatures and microstructure consists of bainitic sheaves. Increasing nitrogen at the same vanadium level promotes the acicular ferrite formation. For high reheating temperatures, dominantly acicular ferrite structure in both the low nitrogen and the high nitrogen vanadium steels is obtained. The results suggest that vanadium in solid solution promotes the formation of bainite, whereas the effect of nitrogen is related to the precipitation of VN particles in austenite with high potency for intragranular nucleation of acicular ferrite and to the precipitation of V(C,N) particles in ferrite with high potency for precipitation strengthening. Addition of both vanadium and nitrogen considerably increases the strength level, while CVN20 impact energy increases on changing the microstructure from bainitic ferrite to the fine ferrite-pearlite and acicular ferrite.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
C3  - THERMEC 2009, PTS 1-4
T1  - Influence of V and N on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels
SP  - 3459
VL  - 638-642
DO  - 10.4028/www.scientific.net/MSF.638-642.3459
ER  - 

@conference{
author = "Radović, Nenad and Koprivica, Ankica and Glišić, Dragomir and Fadel, Abdunnaser and Drobnjak, Đorđe",
year = "2010",
abstract = "The influence of vanadium and nitrogen on microstructure and mechanical properties of medium-carbon steels has been studied by means of metallography and mechanical testing. Vanadium addition to the low nitrogen steel suppresses the formation of ferrite-pearlite following the low reheating temperatures and microstructure consists of bainitic sheaves. Increasing nitrogen at the same vanadium level promotes the acicular ferrite formation. For high reheating temperatures, dominantly acicular ferrite structure in both the low nitrogen and the high nitrogen vanadium steels is obtained. The results suggest that vanadium in solid solution promotes the formation of bainite, whereas the effect of nitrogen is related to the precipitation of VN particles in austenite with high potency for intragranular nucleation of acicular ferrite and to the precipitation of V(C,N) particles in ferrite with high potency for precipitation strengthening. Addition of both vanadium and nitrogen considerably increases the strength level, while CVN20 impact energy increases on changing the microstructure from bainitic ferrite to the fine ferrite-pearlite and acicular ferrite.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "THERMEC 2009, PTS 1-4",
title = "Influence of V and N on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels",
pages = "3459",
volume = "638-642",
doi = "10.4028/www.scientific.net/MSF.638-642.3459"
}

Radović, N., Koprivica, A., Glišić, D., Fadel, A.,& Drobnjak, Đ.. (2010). Influence of V and N on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels. in THERMEC 2009, PTS 1-4
Trans Tech Publications Ltd, Durnten-Zurich., 638-642, 3459.
https://doi.org/10.4028/www.scientific.net/MSF.638-642.3459

Radović N, Koprivica A, Glišić D, Fadel A, Drobnjak Đ. Influence of V and N on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels. in THERMEC 2009, PTS 1-4. 2010;638-642:3459.
doi:10.4028/www.scientific.net/MSF.638-642.3459 .

Radović, Nenad, Koprivica, Ankica, Glišić, Dragomir, Fadel, Abdunnaser, Drobnjak, Đorđe, "Influence of V and N on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels" in THERMEC 2009, PTS 1-4, 638-642 (2010):3459,
https://doi.org/10.4028/www.scientific.net/MSF.638-642.3459 . .

TY  - JOUR
AU  - Radović, Nenad
AU  - Koprivica, Ankica
AU  - Glišić, Dragomir
AU  - Abdunnaser, Fadel
AU  - Drobnjak, Đorđe
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1603
AB  - The influence of Cr, Mo and Mn on microstructure and mechanical properties of V-microalloyed medium-carbon steels has been studied by means of metallography and mechanical testing. Cr, Mn and Mo addition promotes the formation of bainitic sheaves suppressing the formation of ferrite-pearlite and acicular ferrite. The influence of Mn is somewhat masked by a low content of nitrogen. In a low nitrogen steel VN particles are not present and the nucleation of acicular ferrite is suppressed. The yield strength of Cr, Mo and Mn alloyed steels with bainite structures is lower in comparison to the base steel due to less pronounced precipitation strengthening effect. The presence of bainitic sheaves decreases the CVN20 impact energy in comparison to ferrite-pearlite and acicular ferrite microstructures.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - Influence of Cr, Mn and Mo on structure and properties of V microalloyed medium carbon forging steels
EP  - 9
IS  - 1
SP  - 1
VL  - 16
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1603
ER  - 

@article{
author = "Radović, Nenad and Koprivica, Ankica and Glišić, Dragomir and Abdunnaser, Fadel and Drobnjak, Đorđe",
year = "2010",
abstract = "The influence of Cr, Mo and Mn on microstructure and mechanical properties of V-microalloyed medium-carbon steels has been studied by means of metallography and mechanical testing. Cr, Mn and Mo addition promotes the formation of bainitic sheaves suppressing the formation of ferrite-pearlite and acicular ferrite. The influence of Mn is somewhat masked by a low content of nitrogen. In a low nitrogen steel VN particles are not present and the nucleation of acicular ferrite is suppressed. The yield strength of Cr, Mo and Mn alloyed steels with bainite structures is lower in comparison to the base steel due to less pronounced precipitation strengthening effect. The presence of bainitic sheaves decreases the CVN20 impact energy in comparison to ferrite-pearlite and acicular ferrite microstructures.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "Influence of Cr, Mn and Mo on structure and properties of V microalloyed medium carbon forging steels",
pages = "9-1",
number = "1",
volume = "16",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1603"
}

Radović, N., Koprivica, A., Glišić, D., Abdunnaser, F.,& Drobnjak, Đ.. (2010). Influence of Cr, Mn and Mo on structure and properties of V microalloyed medium carbon forging steels. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 16(1), 1-9.
https://hdl.handle.net/21.15107/rcub_technorep_1603

Radović N, Koprivica A, Glišić D, Abdunnaser F, Drobnjak Đ. Influence of Cr, Mn and Mo on structure and properties of V microalloyed medium carbon forging steels. in Metalurgija. 2010;16(1):1-9.
https://hdl.handle.net/21.15107/rcub_technorep_1603 .

Radović, Nenad, Koprivica, Ankica, Glišić, Dragomir, Abdunnaser, Fadel, Drobnjak, Đorđe, "Influence of Cr, Mn and Mo on structure and properties of V microalloyed medium carbon forging steels" in Metalurgija, 16, no. 1 (2010):1-9,
https://hdl.handle.net/21.15107/rcub_technorep_1603 .

TY  - JOUR
AU  - Glišić, Dragomir
AU  - Radović, Nenad
AU  - Koprivica, Ankica
AU  - Fadel, Abdunnaser
AU  - Drobnjak, Đorđe
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1689
AB  - The influence of vanadium and nitrogen on microstructure and mechanical properties of medium-carbon steels has been studied by means of metallography and mechanical testing. Vanadium addition to the low nitrogen steel suppresses the formation of ferrite-pearlite following the low reheating temperatures and microstructure consists of bainitic sheaves. Increasing nitrogen at the same vanadium level promotes the acicular ferrite formation. For high reheating temperatures, dominantly acicular ferrite structure in both the low nitrogen and the high nitrogen vanadium steels is obtained. The results suggest that vanadium in solid solution promotes the formation of bainite. The effect of nitrogen is related to the precipitation of VN particles in austenite with high potency for intragranular nucleation of acicular ferrite and to the precipitation of V(C, N) particles in ferrite with high potency for precipitation strengthening. Addition of both vanadium and nitrogen considerably increases the strength level, while CVN(20) impact energy increases on changing the microstructure from bainitic ferrite to the fine ferrite-pearlite and acicular ferrite.
PB  - Iron Steel Inst Japan Keidanren Kaikan, Tokyo
T2  - ISIJ International
T1  - Influence of Reheating Temperature and Vanadium Content on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels
EP  - 606
IS  - 4
SP  - 601
VL  - 50
DO  - 10.2355/isijinternational.50.601
ER  - 

@article{
author = "Glišić, Dragomir and Radović, Nenad and Koprivica, Ankica and Fadel, Abdunnaser and Drobnjak, Đorđe",
year = "2010",
abstract = "The influence of vanadium and nitrogen on microstructure and mechanical properties of medium-carbon steels has been studied by means of metallography and mechanical testing. Vanadium addition to the low nitrogen steel suppresses the formation of ferrite-pearlite following the low reheating temperatures and microstructure consists of bainitic sheaves. Increasing nitrogen at the same vanadium level promotes the acicular ferrite formation. For high reheating temperatures, dominantly acicular ferrite structure in both the low nitrogen and the high nitrogen vanadium steels is obtained. The results suggest that vanadium in solid solution promotes the formation of bainite. The effect of nitrogen is related to the precipitation of VN particles in austenite with high potency for intragranular nucleation of acicular ferrite and to the precipitation of V(C, N) particles in ferrite with high potency for precipitation strengthening. Addition of both vanadium and nitrogen considerably increases the strength level, while CVN(20) impact energy increases on changing the microstructure from bainitic ferrite to the fine ferrite-pearlite and acicular ferrite.",
publisher = "Iron Steel Inst Japan Keidanren Kaikan, Tokyo",
journal = "ISIJ International",
title = "Influence of Reheating Temperature and Vanadium Content on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels",
pages = "606-601",
number = "4",
volume = "50",
doi = "10.2355/isijinternational.50.601"
}

Glišić, D., Radović, N., Koprivica, A., Fadel, A.,& Drobnjak, Đ.. (2010). Influence of Reheating Temperature and Vanadium Content on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels. in ISIJ International
Iron Steel Inst Japan Keidanren Kaikan, Tokyo., 50(4), 601-606.
https://doi.org/10.2355/isijinternational.50.601

Glišić D, Radović N, Koprivica A, Fadel A, Drobnjak Đ. Influence of Reheating Temperature and Vanadium Content on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels. in ISIJ International. 2010;50(4):601-606.
doi:10.2355/isijinternational.50.601 .

Glišić, Dragomir, Radović, Nenad, Koprivica, Ankica, Fadel, Abdunnaser, Drobnjak, Đorđe, "Influence of Reheating Temperature and Vanadium Content on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels" in ISIJ International, 50, no. 4 (2010):601-606,
https://doi.org/10.2355/isijinternational.50.601 . .

TY  - JOUR
AU  - Radović, Nenad
AU  - Drobnjak, Đorđe
AU  - Raić, Karlo
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1399
AB  - Two microalloyed steels (Nb low carbon and V medium carbon) were tested by means of multistage continuous cooling torsion with aim to evaluate the interpass recrystallization data, by means of Tnr (temperature of no-recrystallization) temperatures. In the region of short interpass intervals, i.e. region where the static recrystallization is governed by the presence of alloying elements in solid solutions, interpass time was varied between 1.8, 2.7, 5 and 10s. Since the recrystallization fraction on Tnr temperature is constant, it was possible to plot lnt-1/T dependence (where t is interpass time and T obtained Tnr temperature) and calculate the slopes representing QSRX, i.e. activation energy for static recrystallization. QSRX values were determined for both low carbon Nb and medium carbon V microalloyed steels and previously reported steels. Calculated values are very close and show good agreement with previously published data estimated after employment the traditional procedure.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - Determination of activation energy for static recrystallization using multipass continuous cooling torsion test
EP  - 104
IS  - 2
SP  - 99
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1399
ER  - 

@article{
author = "Radović, Nenad and Drobnjak, Đorđe and Raić, Karlo",
year = "2009",
abstract = "Two microalloyed steels (Nb low carbon and V medium carbon) were tested by means of multistage continuous cooling torsion with aim to evaluate the interpass recrystallization data, by means of Tnr (temperature of no-recrystallization) temperatures. In the region of short interpass intervals, i.e. region where the static recrystallization is governed by the presence of alloying elements in solid solutions, interpass time was varied between 1.8, 2.7, 5 and 10s. Since the recrystallization fraction on Tnr temperature is constant, it was possible to plot lnt-1/T dependence (where t is interpass time and T obtained Tnr temperature) and calculate the slopes representing QSRX, i.e. activation energy for static recrystallization. QSRX values were determined for both low carbon Nb and medium carbon V microalloyed steels and previously reported steels. Calculated values are very close and show good agreement with previously published data estimated after employment the traditional procedure.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "Determination of activation energy for static recrystallization using multipass continuous cooling torsion test",
pages = "104-99",
number = "2",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1399"
}

Radović, N., Drobnjak, Đ.,& Raić, K.. (2009). Determination of activation energy for static recrystallization using multipass continuous cooling torsion test. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 15(2), 99-104.
https://hdl.handle.net/21.15107/rcub_technorep_1399

Radović N, Drobnjak Đ, Raić K. Determination of activation energy for static recrystallization using multipass continuous cooling torsion test. in Metalurgija. 2009;15(2):99-104.
https://hdl.handle.net/21.15107/rcub_technorep_1399 .

Radović, Nenad, Drobnjak, Đorđe, Raić, Karlo, "Determination of activation energy for static recrystallization using multipass continuous cooling torsion test" in Metalurgija, 15, no. 2 (2009):99-104,
https://hdl.handle.net/21.15107/rcub_technorep_1399 .

TY  - CONF
AU  - Radović, Nenad
AU  - Drobnjak, Đorđe
AU  - Hraam, H.
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/861
PB  - 16th European Conference of Fracture
C3  - Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere
T1  - Nechanisms of fracture in medium carbon vanadium microalloyed steels
EP  - 1074
SP  - 1073
UR  - https://hdl.handle.net/21.15107/rcub_technorep_861
ER  - 

@conference{
author = "Radović, Nenad and Drobnjak, Đorđe and Hraam, H.",
year = "2006",
publisher = "16th European Conference of Fracture",
journal = "Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere",
title = "Nechanisms of fracture in medium carbon vanadium microalloyed steels",
pages = "1074-1073",
url = "https://hdl.handle.net/21.15107/rcub_technorep_861"
}

Radović, N., Drobnjak, Đ.,& Hraam, H.. (2006). Nechanisms of fracture in medium carbon vanadium microalloyed steels. in Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere
16th European Conference of Fracture., 1073-1074.
https://hdl.handle.net/21.15107/rcub_technorep_861

Radović N, Drobnjak Đ, Hraam H. Nechanisms of fracture in medium carbon vanadium microalloyed steels. in Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere. 2006;:1073-1074.
https://hdl.handle.net/21.15107/rcub_technorep_861 .

Radović, Nenad, Drobnjak, Đorđe, Hraam, H., "Nechanisms of fracture in medium carbon vanadium microalloyed steels" in Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere (2006):1073-1074,
https://hdl.handle.net/21.15107/rcub_technorep_861 .

TY  - JOUR
AU  - Radović, Nenad
AU  - Vukicević, Goran
AU  - Jeremić, D.
AU  - Drobnjak, Đorđe
PY  - 2002
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/429
AB  - The aim of this work was to compare the Tnr temperatures of microalloyed steels estimated on laboratory (Tnr**l) and industrial scale (Tnr**l). Laboratory and industrial scale are related to testing on high temperature torsion machine, and calculation based on rolling mill log data obtained from SARTID six stand Hot Strip Mill (HSM), respectively. Obtained results are in good agreement, showing the difference of about 30°C. It is assumed that TnrL has higher value due to use of average values in simulation.
AB  - U radu su upoređene Tnr temperature dobijene u laboratorijskim (TnrL) i industrijskim uslovima (Tnr**l). U laboratorijskim uslovima Tnr**l temperatura je određena na uređaju za ispitivanje uvijanjem na povišenim temperaturama, a u industrijskim uslovima Tnr**l temperatura je određena na osnovu modela dobijenog analizom podataka sa završne pruge Tople valjaonice traka SARTID ad. Rezultati pokazuju dobro slaganje, uz napomenu da je Tnr**l viša od Tnr**l za oko 30 °C. Pretpostavljeno je da je razlika posledica korišćenja prosečnih vrednosti kojima je računala Tnr**l.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - Thermomechanical processing of micro alloyed steels in Sartid A.D.: Part III - comparison of of Tnr temperatures determined on laboratory and industrial scale
T1  - Termomehanička prerada mikrolegiranih čelika koncerna Sartid: III deo - poređenje Tnr temperatura određenih u laboratorijskim i industrijskim uslovima
EP  - 37
IS  - 1
SP  - 31
VL  - 8
UR  - https://hdl.handle.net/21.15107/rcub_technorep_429
ER  - 

@article{
author = "Radović, Nenad and Vukicević, Goran and Jeremić, D. and Drobnjak, Đorđe",
year = "2002",
abstract = "The aim of this work was to compare the Tnr temperatures of microalloyed steels estimated on laboratory (Tnr**l) and industrial scale (Tnr**l). Laboratory and industrial scale are related to testing on high temperature torsion machine, and calculation based on rolling mill log data obtained from SARTID six stand Hot Strip Mill (HSM), respectively. Obtained results are in good agreement, showing the difference of about 30°C. It is assumed that TnrL has higher value due to use of average values in simulation., U radu su upoređene Tnr temperature dobijene u laboratorijskim (TnrL) i industrijskim uslovima (Tnr**l). U laboratorijskim uslovima Tnr**l temperatura je određena na uređaju za ispitivanje uvijanjem na povišenim temperaturama, a u industrijskim uslovima Tnr**l temperatura je određena na osnovu modela dobijenog analizom podataka sa završne pruge Tople valjaonice traka SARTID ad. Rezultati pokazuju dobro slaganje, uz napomenu da je Tnr**l viša od Tnr**l za oko 30 °C. Pretpostavljeno je da je razlika posledica korišćenja prosečnih vrednosti kojima je računala Tnr**l.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "Thermomechanical processing of micro alloyed steels in Sartid A.D.: Part III - comparison of of Tnr temperatures determined on laboratory and industrial scale, Termomehanička prerada mikrolegiranih čelika koncerna Sartid: III deo - poređenje Tnr temperatura određenih u laboratorijskim i industrijskim uslovima",
pages = "37-31",
number = "1",
volume = "8",
url = "https://hdl.handle.net/21.15107/rcub_technorep_429"
}

Radović, N., Vukicević, G., Jeremić, D.,& Drobnjak, Đ.. (2002). Thermomechanical processing of micro alloyed steels in Sartid A.D.: Part III - comparison of of Tnr temperatures determined on laboratory and industrial scale. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 8(1), 31-37.
https://hdl.handle.net/21.15107/rcub_technorep_429

Radović N, Vukicević G, Jeremić D, Drobnjak Đ. Thermomechanical processing of micro alloyed steels in Sartid A.D.: Part III - comparison of of Tnr temperatures determined on laboratory and industrial scale. in Metalurgija. 2002;8(1):31-37.
https://hdl.handle.net/21.15107/rcub_technorep_429 .

Radović, Nenad, Vukicević, Goran, Jeremić, D., Drobnjak, Đorđe, "Thermomechanical processing of micro alloyed steels in Sartid A.D.: Part III - comparison of of Tnr temperatures determined on laboratory and industrial scale" in Metalurgija, 8, no. 1 (2002):31-37,
https://hdl.handle.net/21.15107/rcub_technorep_429 .

TY  - CONF
AU  - Radović, Nenad
AU  - Drobnjak, Đorđe
AU  - Raić, Karlo
PY  - 2001
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/369
AB  - Two microalloyed steels (Nb/Ti low carbon and V medium carbon) were tested by means of continuous cooling multipass tests on high temperature torsion tester, with aim to investigate the recrystallization kinetics. Multistage continuous cooling torsion tests (modified Boratto test for determination of Tnr temperature), have been used to evaluate the interpass recrystallization data. The determination of activation energy for static recrystallization, Q(SRX),. was limited to temperatures above Tnr temperatures, i.e. temperature range in which microalloying elements are in solid solution. Tnr temperatures were, in all cases, related to equal amount of recrystallized fraction, enabling plotting lnt vs. l/T dependence. Activation energies determined for both steels have close values and show good agreement with previously published data.
PB  - Springer-Verlag Berlin, Berlin
C3  - Recrystallization and Grain Growth, Vols 1 and 2
T1  - Determination of activation energy for static recrystallization using multipass continuous cooling torsion test
EP  - 796
SP  - 791
UR  - https://hdl.handle.net/21.15107/rcub_technorep_369
ER  - 

@conference{
author = "Radović, Nenad and Drobnjak, Đorđe and Raić, Karlo",
year = "2001",
abstract = "Two microalloyed steels (Nb/Ti low carbon and V medium carbon) were tested by means of continuous cooling multipass tests on high temperature torsion tester, with aim to investigate the recrystallization kinetics. Multistage continuous cooling torsion tests (modified Boratto test for determination of Tnr temperature), have been used to evaluate the interpass recrystallization data. The determination of activation energy for static recrystallization, Q(SRX),. was limited to temperatures above Tnr temperatures, i.e. temperature range in which microalloying elements are in solid solution. Tnr temperatures were, in all cases, related to equal amount of recrystallized fraction, enabling plotting lnt vs. l/T dependence. Activation energies determined for both steels have close values and show good agreement with previously published data.",
publisher = "Springer-Verlag Berlin, Berlin",
journal = "Recrystallization and Grain Growth, Vols 1 and 2",
title = "Determination of activation energy for static recrystallization using multipass continuous cooling torsion test",
pages = "796-791",
url = "https://hdl.handle.net/21.15107/rcub_technorep_369"
}

Radović, N., Drobnjak, Đ.,& Raić, K.. (2001). Determination of activation energy for static recrystallization using multipass continuous cooling torsion test. in Recrystallization and Grain Growth, Vols 1 and 2
Springer-Verlag Berlin, Berlin., 791-796.
https://hdl.handle.net/21.15107/rcub_technorep_369

Radović N, Drobnjak Đ, Raić K. Determination of activation energy for static recrystallization using multipass continuous cooling torsion test. in Recrystallization and Grain Growth, Vols 1 and 2. 2001;:791-796.
https://hdl.handle.net/21.15107/rcub_technorep_369 .

Radović, Nenad, Drobnjak, Đorđe, Raić, Karlo, "Determination of activation energy for static recrystallization using multipass continuous cooling torsion test" in Recrystallization and Grain Growth, Vols 1 and 2 (2001):791-796,
https://hdl.handle.net/21.15107/rcub_technorep_369 .

TY  - JOUR
AU  - Radović, Nenad
AU  - Drobnjak, Đorđe
PY  - 2001
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/363
AB  - Physical and metallurgical basis of historical steel development and some modern solutions for specific applications, together with predictions and projections of future development are reviewed in this paper. Undoubtedly, in future, steel will remain absolutely most used construction material due to the best relationship properties/price. Dominant place is reserved for steels for welded constructions, and their further development will be provided by application of concept of Total Thermomechanical Control Processing (TTCMP). Simultaneously, predictions consider intensive Development in the field of welding procedures, filler materials, modeling of TMCP and welding, with aim to provide fabrication of welded constructions with improved safety.
AB  - U radu su izložene fiziko-metalurške osnove istorijskog razvoja čeličnih materijala, primeri savremenih rešenja čelika za specifične namene i pretpostavke daljeg razvoja. Nedvosmisleno, u budućnosti, čelični materijali će ostati suvereno najrasprostranjeniji konstrukcioni materijal, zbog najboljeg odnosa kvalitet/cena. Dominantno mesto će zauzimati čelici predviđeni za izradu zavarenih konstrukcija, a njihov razvoj će biti omogućen konceptom totalne termomehaničke prerade. Uporedo, predviđa se intenzivan razvoj na polju tehnologija zavarivanja, dodatnih materijala, matematičkog modeliranja termomehaničke prerade i zavarivanja, sa ciljem da se obezbedi izrada zavarenih konstrukcija povišene sigurnosti.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Development of steels for fabrication of welded constructions with improved safety
T1  - Razvoj čelika za izradu zavarenih konstrukcija povišene sigurnosti
EP  - 92
IS  - 3
SP  - 81
VL  - 46
UR  - https://hdl.handle.net/21.15107/rcub_technorep_363
ER  - 

@article{
author = "Radović, Nenad and Drobnjak, Đorđe",
year = "2001",
abstract = "Physical and metallurgical basis of historical steel development and some modern solutions for specific applications, together with predictions and projections of future development are reviewed in this paper. Undoubtedly, in future, steel will remain absolutely most used construction material due to the best relationship properties/price. Dominant place is reserved for steels for welded constructions, and their further development will be provided by application of concept of Total Thermomechanical Control Processing (TTCMP). Simultaneously, predictions consider intensive Development in the field of welding procedures, filler materials, modeling of TMCP and welding, with aim to provide fabrication of welded constructions with improved safety., U radu su izložene fiziko-metalurške osnove istorijskog razvoja čeličnih materijala, primeri savremenih rešenja čelika za specifične namene i pretpostavke daljeg razvoja. Nedvosmisleno, u budućnosti, čelični materijali će ostati suvereno najrasprostranjeniji konstrukcioni materijal, zbog najboljeg odnosa kvalitet/cena. Dominantno mesto će zauzimati čelici predviđeni za izradu zavarenih konstrukcija, a njihov razvoj će biti omogućen konceptom totalne termomehaničke prerade. Uporedo, predviđa se intenzivan razvoj na polju tehnologija zavarivanja, dodatnih materijala, matematičkog modeliranja termomehaničke prerade i zavarivanja, sa ciljem da se obezbedi izrada zavarenih konstrukcija povišene sigurnosti.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Development of steels for fabrication of welded constructions with improved safety, Razvoj čelika za izradu zavarenih konstrukcija povišene sigurnosti",
pages = "92-81",
number = "3",
volume = "46",
url = "https://hdl.handle.net/21.15107/rcub_technorep_363"
}

Radović, N.,& Drobnjak, Đ.. (2001). Development of steels for fabrication of welded constructions with improved safety. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 46(3), 81-92.
https://hdl.handle.net/21.15107/rcub_technorep_363

Radović N, Drobnjak Đ. Development of steels for fabrication of welded constructions with improved safety. in Zavarivanje i zavarene konstrukcije. 2001;46(3):81-92.
https://hdl.handle.net/21.15107/rcub_technorep_363 .

Radović, Nenad, Drobnjak, Đorđe, "Development of steels for fabrication of welded constructions with improved safety" in Zavarivanje i zavarene konstrukcije, 46, no. 3 (2001):81-92,
https://hdl.handle.net/21.15107/rcub_technorep_363 .

TY  - JOUR
AU  - Radović, Nenad
AU  - Drobnjak, Đorđe
PY  - 1999
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/239
AB  - Two-stage linear In[sinh(alpha sigma)] vs. 1/T relations indicative of double Q(HW) behavior, are obtained from anisothermal multipass flow curves generated by testing Nb/Ti microalloyed steel in torsion tin the range 1250-800 degrees C), except for the case of the high cooling rate-short interpass time tests, which gave rise to single-stage plots, indicative of single QHW behavior. Above the T-nr the QV (apparent activation energy for hot working corresponding to the upper temperature range is little affected by test variables (interpass time and cooling rate) and type of deformation (isothermal continuous and anisothermal multipass deformation give virtually equivalent Q(H)(W)(U), values above the T-nr). However, below the T-nr the O-HW(L) corresponding to the lower temperature range, becomes sensitive to test variables, a nd may show considerable deviation from O-HW(L) Obtained in continuous tests. Therefore, the temperature dependence of the flow stress, below the T-nr relevant to a multipass hot working operation, can be well described only by the Q(HW)(L) Obtained from the multipass flow curves, because it is interpass time dependent. The interpass time dependence of both the Q(HW)(L) and the T-nr,, can be divided into three regions. Within the short interpass time region (1.8 to 10 sec), the two parameters show opposite trends, while beyond 10 sec they correlate well. Within the 1.8 to 10 sec region the T-nr,, is assumed to be controlled by Nb in solid solution, while the O-HW(L) is controlled by both solute and precipitation effect. Beyond 10sec precipitation is the only controlling mechanism. In addition to the T-nr derived from Mean Flow Stress (MFS) and in [sinh(alpha sigma)] vs. 1/T plots, the recrystallization limit, T-rl which correlates well with both T-nr,,'s, and the recrystallization stop, T-rs temperatures are derived from % Fractional Softening (FS) vs. 1/T plots.
PB  - Iron Steel Inst Japan Keidanren Kaikan, Tokyo
T2  - ISIJ International
T1  - Effect of interpass time and cooling rate on apparent activation energy for hot working and critical recrystallization temperature of Nb-microalloyed steel
EP  - 582
IS  - 6
SP  - 575
VL  - 39
DO  - 10.2355/isijinternational.39.575
ER  - 

@article{
author = "Radović, Nenad and Drobnjak, Đorđe",
year = "1999",
abstract = "Two-stage linear In[sinh(alpha sigma)] vs. 1/T relations indicative of double Q(HW) behavior, are obtained from anisothermal multipass flow curves generated by testing Nb/Ti microalloyed steel in torsion tin the range 1250-800 degrees C), except for the case of the high cooling rate-short interpass time tests, which gave rise to single-stage plots, indicative of single QHW behavior. Above the T-nr the QV (apparent activation energy for hot working corresponding to the upper temperature range is little affected by test variables (interpass time and cooling rate) and type of deformation (isothermal continuous and anisothermal multipass deformation give virtually equivalent Q(H)(W)(U), values above the T-nr). However, below the T-nr the O-HW(L) corresponding to the lower temperature range, becomes sensitive to test variables, a nd may show considerable deviation from O-HW(L) Obtained in continuous tests. Therefore, the temperature dependence of the flow stress, below the T-nr relevant to a multipass hot working operation, can be well described only by the Q(HW)(L) Obtained from the multipass flow curves, because it is interpass time dependent. The interpass time dependence of both the Q(HW)(L) and the T-nr,, can be divided into three regions. Within the short interpass time region (1.8 to 10 sec), the two parameters show opposite trends, while beyond 10 sec they correlate well. Within the 1.8 to 10 sec region the T-nr,, is assumed to be controlled by Nb in solid solution, while the O-HW(L) is controlled by both solute and precipitation effect. Beyond 10sec precipitation is the only controlling mechanism. In addition to the T-nr derived from Mean Flow Stress (MFS) and in [sinh(alpha sigma)] vs. 1/T plots, the recrystallization limit, T-rl which correlates well with both T-nr,,'s, and the recrystallization stop, T-rs temperatures are derived from % Fractional Softening (FS) vs. 1/T plots.",
publisher = "Iron Steel Inst Japan Keidanren Kaikan, Tokyo",
journal = "ISIJ International",
title = "Effect of interpass time and cooling rate on apparent activation energy for hot working and critical recrystallization temperature of Nb-microalloyed steel",
pages = "582-575",
number = "6",
volume = "39",
doi = "10.2355/isijinternational.39.575"
}

Radović, N.,& Drobnjak, Đ.. (1999). Effect of interpass time and cooling rate on apparent activation energy for hot working and critical recrystallization temperature of Nb-microalloyed steel. in ISIJ International
Iron Steel Inst Japan Keidanren Kaikan, Tokyo., 39(6), 575-582.
https://doi.org/10.2355/isijinternational.39.575

Radović N, Drobnjak Đ. Effect of interpass time and cooling rate on apparent activation energy for hot working and critical recrystallization temperature of Nb-microalloyed steel. in ISIJ International. 1999;39(6):575-582.
doi:10.2355/isijinternational.39.575 .

Radović, Nenad, Drobnjak, Đorđe, "Effect of interpass time and cooling rate on apparent activation energy for hot working and critical recrystallization temperature of Nb-microalloyed steel" in ISIJ International, 39, no. 6 (1999):575-582,
https://doi.org/10.2355/isijinternational.39.575 . .

TY  - JOUR
AU  - Drobnjak, Đorđe
AU  - Radović, Nenad
AU  - Andjeli, M
AU  - Koprivica, Ankica
PY  - 1997
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/134
AB  - The effect of test variables on the apparent activation energy for hot working of a medium carbon V-microalloyed steel, Q(HW), and the critical recrystallization temperature, T-nr, have been studied by means of isothermal continuous and anisothermal multipass torsion test. The Q(HW) is found to be temperature dependent. Above the T-nr, the Q(HW)(U) is close to that of austenite self diffusion, Q(SD), irrespective of the type of test or test variables. Below the T-nr, the Q(HW)(L) is not only considerably higher, but that based on multipass flow curve exibits a strong interpass time dependence. With increasing interpass time from 1.8 to 10 s the Q(HW)(L) and the T-nr increase and decrease respectively. The former is assumed to be controlled by solute drag, while the latter both by solute drag and precipitation pinning. Beyond 10 s, the two parameters exhibit the same trend, and the precipitation pinning is assumed to be the only recrystallization inhibiting mechanism.
PB  - Verlag Stahleisen Mbh, Dusseldorf
T2  - Steel Research
T1  - Effect of test variables on apparent activation energy for hot working and critical recrystallization temperatures of V-microalloyed steel
EP  - 312
IS  - 7
SP  - 306
VL  - 68
DO  - 10.1002/srin.199701794
ER  - 

@article{
author = "Drobnjak, Đorđe and Radović, Nenad and Andjeli, M and Koprivica, Ankica",
year = "1997",
abstract = "The effect of test variables on the apparent activation energy for hot working of a medium carbon V-microalloyed steel, Q(HW), and the critical recrystallization temperature, T-nr, have been studied by means of isothermal continuous and anisothermal multipass torsion test. The Q(HW) is found to be temperature dependent. Above the T-nr, the Q(HW)(U) is close to that of austenite self diffusion, Q(SD), irrespective of the type of test or test variables. Below the T-nr, the Q(HW)(L) is not only considerably higher, but that based on multipass flow curve exibits a strong interpass time dependence. With increasing interpass time from 1.8 to 10 s the Q(HW)(L) and the T-nr increase and decrease respectively. The former is assumed to be controlled by solute drag, while the latter both by solute drag and precipitation pinning. Beyond 10 s, the two parameters exhibit the same trend, and the precipitation pinning is assumed to be the only recrystallization inhibiting mechanism.",
publisher = "Verlag Stahleisen Mbh, Dusseldorf",
journal = "Steel Research",
title = "Effect of test variables on apparent activation energy for hot working and critical recrystallization temperatures of V-microalloyed steel",
pages = "312-306",
number = "7",
volume = "68",
doi = "10.1002/srin.199701794"
}

Drobnjak, Đ., Radović, N., Andjeli, M.,& Koprivica, A.. (1997). Effect of test variables on apparent activation energy for hot working and critical recrystallization temperatures of V-microalloyed steel. in Steel Research
Verlag Stahleisen Mbh, Dusseldorf., 68(7), 306-312.
https://doi.org/10.1002/srin.199701794

Drobnjak Đ, Radović N, Andjeli M, Koprivica A. Effect of test variables on apparent activation energy for hot working and critical recrystallization temperatures of V-microalloyed steel. in Steel Research. 1997;68(7):306-312.
doi:10.1002/srin.199701794 .

Drobnjak, Đorđe, Radović, Nenad, Andjeli, M, Koprivica, Ankica, "Effect of test variables on apparent activation energy for hot working and critical recrystallization temperatures of V-microalloyed steel" in Steel Research, 68, no. 7 (1997):306-312,
https://doi.org/10.1002/srin.199701794 . .

TY  - JOUR
AU  - Drobnjak, Đorđe
AU  - Koprivica, Ankica
AU  - Radović, Nenad
AU  - Jelić, M.
PY  - 1996
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/69
AB  - Two-stage linear In [sinh(ασca)] vs.1/T plots, based on isothermal continuous and anisothermal multipass torsion curves, indicate the double Q HW behaviour of a V-steel. Above T nr , Q HW is independent of all variables but strain. Below T nr (which is interpass time dependent), i.e., in a temperature range in which interpass recrystallization is supressed, Q HW is not only increased but that based on multipass curves is also interpass time dependent, and only valid for multipass working operations.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Apparent energy of activation for hot working of vanadium microalloyed steel
EP  - 614
IS  - 7
SP  - 609
VL  - 61
UR  - https://hdl.handle.net/21.15107/rcub_technorep_69
ER  - 

@article{
author = "Drobnjak, Đorđe and Koprivica, Ankica and Radović, Nenad and Jelić, M.",
year = "1996",
abstract = "Two-stage linear In [sinh(ασca)] vs.1/T plots, based on isothermal continuous and anisothermal multipass torsion curves, indicate the double Q HW behaviour of a V-steel. Above T nr , Q HW is independent of all variables but strain. Below T nr (which is interpass time dependent), i.e., in a temperature range in which interpass recrystallization is supressed, Q HW is not only increased but that based on multipass curves is also interpass time dependent, and only valid for multipass working operations.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Apparent energy of activation for hot working of vanadium microalloyed steel",
pages = "614-609",
number = "7",
volume = "61",
url = "https://hdl.handle.net/21.15107/rcub_technorep_69"
}

Drobnjak, Đ., Koprivica, A., Radović, N.,& Jelić, M.. (1996). Apparent energy of activation for hot working of vanadium microalloyed steel. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 61(7), 609-614.
https://hdl.handle.net/21.15107/rcub_technorep_69

Drobnjak Đ, Koprivica A, Radović N, Jelić M. Apparent energy of activation for hot working of vanadium microalloyed steel. in Journal of the Serbian Chemical Society. 1996;61(7):609-614.
https://hdl.handle.net/21.15107/rcub_technorep_69 .

Drobnjak, Đorđe, Koprivica, Ankica, Radović, Nenad, Jelić, M., "Apparent energy of activation for hot working of vanadium microalloyed steel" in Journal of the Serbian Chemical Society, 61, no. 7 (1996):609-614,
https://hdl.handle.net/21.15107/rcub_technorep_69 .