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 ferr...ite-pearlite units with similar crystallographic orientation and higher value to fracture propagation through fine acicular ferrite matrix.
Keywords:
Micro-alloyed steel / Cleavage stress / Surface energy
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 . .
