TY  - JOUR
AU  - Dikić, Stefan
AU  - Glišić, Dragomir
AU  - Fadel, Abdunaser
AU  - Jovanović, Gvozden
AU  - Radović, Nenad
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/590
AB  - Isothermal transformation characteristics of a medium carbon Ti-V microalloyed steel were investigated using light microscopy, scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), and by uniaxial compressive testing. Samples austenitized on 1100 degrees C were isothermally treated in the range from 350 to 600 degrees C and subsequently water quenched. The final microstructure of the samples held at 350 degrees C consisted of bainitic sheaves and had compressive yield strength, approximately from 1000 MPa, which is attributed to high dislocation density of low bainite. At 400 and 450 degrees C, acicular ferrite became prevalent in the microstructure. It was also formed by a displacive mechanism, but the dislocation density was lower, leading to a decrease of compressive yield strength to approximately 700 MPa. The microstructure after the heat treatment at 500 degrees C consisted of coarse non-polygonal ferrite grains separated by pearlite colonies, principally dislocation free grains, so that the compressive YS reached a minimum value of about 700 MPa. The microstructure of the samples heat-treated at 550 and 600 degrees C consisted of pearlite and both grain boundary and intragranular ferrite, alongside with some martensite. After 600 s, austenite became stable and transformed to martensite after water quenching. Therefore, the presence of martensite increased the compressive YS to approx. 800 MPa.
PB  - MDPI, Basel
T2  - Metals
T1  - Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel
IS  - 7
VL  - 11
DO  - 10.3390/met11071011
UR  - conv_911
ER  - 

@article{
author = "Dikić, Stefan and Glišić, Dragomir and Fadel, Abdunaser and Jovanović, Gvozden and Radović, Nenad",
year = "2021",
abstract = "Isothermal transformation characteristics of a medium carbon Ti-V microalloyed steel were investigated using light microscopy, scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), and by uniaxial compressive testing. Samples austenitized on 1100 degrees C were isothermally treated in the range from 350 to 600 degrees C and subsequently water quenched. The final microstructure of the samples held at 350 degrees C consisted of bainitic sheaves and had compressive yield strength, approximately from 1000 MPa, which is attributed to high dislocation density of low bainite. At 400 and 450 degrees C, acicular ferrite became prevalent in the microstructure. It was also formed by a displacive mechanism, but the dislocation density was lower, leading to a decrease of compressive yield strength to approximately 700 MPa. The microstructure after the heat treatment at 500 degrees C consisted of coarse non-polygonal ferrite grains separated by pearlite colonies, principally dislocation free grains, so that the compressive YS reached a minimum value of about 700 MPa. The microstructure of the samples heat-treated at 550 and 600 degrees C consisted of pearlite and both grain boundary and intragranular ferrite, alongside with some martensite. After 600 s, austenite became stable and transformed to martensite after water quenching. Therefore, the presence of martensite increased the compressive YS to approx. 800 MPa.",
publisher = "MDPI, Basel",
journal = "Metals",
title = "Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel",
number = "7",
volume = "11",
doi = "10.3390/met11071011",
url = "conv_911"
}

Dikić, S., Glišić, D., Fadel, A., Jovanović, G.,& Radović, N.. (2021). Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel. in Metals
MDPI, Basel., 11(7).
https://doi.org/10.3390/met11071011
conv_911

Dikić S, Glišić D, Fadel A, Jovanović G, Radović N. Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel. in Metals. 2021;11(7).
doi:10.3390/met11071011
conv_911 .

Dikić, Stefan, Glišić, Dragomir, Fadel, Abdunaser, Jovanović, Gvozden, Radović, Nenad, "Structure and Strength of Isothermally Heat-Treated Medium Carbon Ti-V Microalloyed Steel" in Metals, 11, no. 7 (2021),
https://doi.org/10.3390/met11071011 .,
conv_911 .

TY  - CONF
AU  - Jovanović, Gvozden
AU  - Glišić, Dragomir
AU  - Radović, Nenad
AU  - Rakin, Marko
PY  - 2015
UR  - https://ritnms.itnms.ac.rs/handle/123456789/946
AB  - Cleavage fracture of commercial medium-carbon V-microalloyed forging steel with predominantly acicular ferrite structure was studied by means of fourpoint bending testing at liquid nitrogen temperature in conjunction with finite element analysis. Both two-dimensional and three-dimensional finite element models were used for the purpose of comparison. Cleavage fracture was initiated
by high plastic strains in the vicinity of notch tip. Strains calculated by threedimensional modeling were higher up to 80% than for two-dimensional model. Calculated local cleavage fracture stresses rendered effective surface energy
values of 49J/m2 and 60J/m2, for two-dimensional and three-dimensional numerical model, respectively. Both results are in good agreement with previously published data for medium carbon microalloyed steels.
PB  - Belgrade : Association of Metallurgical Engineers of Serbia
C3  - Metallurgical & Materials Engineering Congress of South-East Europe MME SEE 2015
T1  - Calculation of local cleavage fracture stress in a medium-carbon V-microalloyed steel using finite element analysis
EP  - 275
SP  - 269
ER  - 

@conference{
author = "Jovanović, Gvozden and Glišić, Dragomir and Radović, Nenad and Rakin, Marko",
year = "2015",
abstract = "Cleavage fracture of commercial medium-carbon V-microalloyed forging steel with predominantly acicular ferrite structure was studied by means of fourpoint bending testing at liquid nitrogen temperature in conjunction with finite element analysis. Both two-dimensional and three-dimensional finite element models were used for the purpose of comparison. Cleavage fracture was initiated
by high plastic strains in the vicinity of notch tip. Strains calculated by threedimensional modeling were higher up to 80% than for two-dimensional model. Calculated local cleavage fracture stresses rendered effective surface energy
values of 49J/m2 and 60J/m2, for two-dimensional and three-dimensional numerical model, respectively. Both results are in good agreement with previously published data for medium carbon microalloyed steels.",
publisher = "Belgrade : Association of Metallurgical Engineers of Serbia",
journal = "Metallurgical & Materials Engineering Congress of South-East Europe MME SEE 2015",
title = "Calculation of local cleavage fracture stress in a medium-carbon V-microalloyed steel using finite element analysis",
pages = "275-269"
}

Jovanović, G., Glišić, D., Radović, N.,& Rakin, M.. (2015). Calculation of local cleavage fracture stress in a medium-carbon V-microalloyed steel using finite element analysis. in Metallurgical & Materials Engineering Congress of South-East Europe MME SEE 2015
Belgrade : Association of Metallurgical Engineers of Serbia., 269-275.

Jovanović G, Glišić D, Radović N, Rakin M. Calculation of local cleavage fracture stress in a medium-carbon V-microalloyed steel using finite element analysis. in Metallurgical & Materials Engineering Congress of South-East Europe MME SEE 2015. 2015;:269-275..

Jovanović, Gvozden, Glišić, Dragomir, Radović, Nenad, Rakin, Marko, "Calculation of local cleavage fracture stress in a medium-carbon V-microalloyed steel using finite element analysis" in Metallurgical & Materials Engineering Congress of South-East Europe MME SEE 2015 (2015):269-275.