TY - GEN
T1 - The dynamic recrystallization of hot-deformed austenite in a micro-alloyed steel
AU - She, Yuan
AU - Zhang, Zhaohui
AU - Yang, Jun
AU - Ju, Jiantao
PY - 2012
Y1 - 2012
N2 - As the dynamic recrystallization (DRX) behavior of hot-deformed austenite is the basis of determining controlled rolling schedule for steel, in the present work, the dynamic recrystallization behavior of austenite of a 0.22%C-1.30%Mn-0.04%Nb micro-alloyed steel was investigated by means of high temperature compression tests on the Thermecmastor-Z simulator. By the analysis of true stress-strain curves at different deformation stages, the hot deformation equation of austenite was established for the steel. As a result, the energy to induce recrystallization of austenite for the steel is 419.1 kJ{dot operator}mol-1, as it was influenced by the drag effect of micro-alloyed element Nb in solid solution. The ratio (σc/σp) of critical stress σc (where DRX occurs) to peak stress σp is 0.93 while the ratio (εc/εp) of critical strain εc to peak stress εp is 0.52 for the steel. The austenite grain size of dynamic recrystallization of the micro-alloyed steel is refined by decreasing the deformation temperature and improving the stain rate.
AB - As the dynamic recrystallization (DRX) behavior of hot-deformed austenite is the basis of determining controlled rolling schedule for steel, in the present work, the dynamic recrystallization behavior of austenite of a 0.22%C-1.30%Mn-0.04%Nb micro-alloyed steel was investigated by means of high temperature compression tests on the Thermecmastor-Z simulator. By the analysis of true stress-strain curves at different deformation stages, the hot deformation equation of austenite was established for the steel. As a result, the energy to induce recrystallization of austenite for the steel is 419.1 kJ{dot operator}mol-1, as it was influenced by the drag effect of micro-alloyed element Nb in solid solution. The ratio (σc/σp) of critical stress σc (where DRX occurs) to peak stress σp is 0.93 while the ratio (εc/εp) of critical strain εc to peak stress εp is 0.52 for the steel. The austenite grain size of dynamic recrystallization of the micro-alloyed steel is refined by decreasing the deformation temperature and improving the stain rate.
KW - Austenite
KW - Dynamic recrystallization
KW - Hot-deformation
KW - Micro-alloyed steel
UR - https://www.scopus.com/pages/publications/84872458405
U2 - 10.4028/www.scientific.net/MSF.724.287
DO - 10.4028/www.scientific.net/MSF.724.287
M3 - Conference contribution
AN - SCOPUS:84872458405
SN - 9783037854396
T3 - Materials Science Forum
SP - 287
EP - 290
BT - Eco-Materials Processing and Design XIII
PB - Trans Tech Publications Ltd.
T2 - 13th International Symposium on Eco-Materials Processing and Design, ISEPD 2012
Y2 - 7 January 2012 through 10 January 2012
ER -