Constitutive Modeling and Dynamic Recrystallization Mechanisms of an Ultralow-carbon Microalloyed Steel During Hot Compression Tests  

作　　者：LI Ning HUANG Yao HAN Renheng BAO Ziming ZHU Yanqing ZHANG Hexin ZHAO Chengzhi 李宁;HUANG Yao;HAN Renheng;BAO Ziming;ZHU Yanqing;ZHANG Hexin;赵成志(Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2020年第5期946-957,共12页武汉理工大学学报（材料科学英文版）

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)。

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.

关 键 词：ultra-low carbon microalloyed steel hot deformation behavior constitutive modeling dynamic recrystallization 

分 类 号：TG142.33[一般工业技术—材料科学与工程]