摘要
The hot deformation behavior of an ultralow-carbon microalloyed steel was investigated using an MMS-200 thermal simulation test machine in a temperature range of 1073-1373 K and strain rate range of 0.01-10 s-1.The results show that the flow stress decreases with increasing deformation temperature or decreasing strain rate.The strain-compensated constitutive model based on the Arrhenius equation for this steel was established using the true stress-strain data obtained from a hot compression test.Furthermore,a new constitutive model based on the Z-parameter was proposed for this steel.The predictive ability of two constitutive models was compared with statistical measures.The results indicate the new constitutive model based on the Z-parameter can more accurately predict the flow stress of an ultralow-carbon microalloyed steel during hot deformation.The dynamic recrystallization(DRX)nucleation mechanism at different deformation temperatures was observed and analyzed by transmission electron microscopy(TEM),and strain-induced grain boundary migration was observed at 1373 K/0.01 s^-1.
作者
李宁
HUANG Yao
HAN Renheng
BAO Ziming
ZHU Yanqing
ZHANG Hexin
赵成志
LI Ning;HUANG Yao;HAN Renheng;BAO Ziming;ZHU Yanqing;ZHANG Hexin;ZHAO Chengzhi(Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China)
基金
Funded by the Fundamental Research Funds for the Central Universities(Nos.HEUCFP201731 and HEUCFP201719)
the"One Three Five"Equipment Pre-research National Defense Science and Technology Key Laboratory Fund(No.KZ42180125)。
