Modeling of metadynamic recrystallization kinetics after hot deformation of low-alloy steel Q345B  

作　　者：马博 彭艳 刘云飞 贾斌 

机构地区：[1]State Key Laboratory of Metastable Materials Science and Technology,Yanshan University [2]Engineering Research Center of Rolling Equipment and Complete Technology of Ministry of Education,Yanshan University

出　　处：《Journal of Central South University》2010年第5期911-917,共7页中南大学学报（英文版）

基　　金：Project(101048) supported by Fok Ying Tung Education Foundation;Project(E2008000835) supported by the Natural Science Foundation of Hebei Province,China

摘　　要：Based on the steady-state strain measured by single-pass hot compression tests,the method by a double-pass hot compression testing was developed to measure the metadynamic-recrystallization kinetics.The metadynamic recrystallization behavior of low-alloy steel Q345B during hot compression deformation was investigated in the temperature range of 1 000-1 100℃,the strain rate range of 0.01-0.10 s -1 and the interpass time range of 0.5-50 s on a Gleeble-3500 thermo-simulation machine.The results show that metadynamic recrystallization during the interpass time can be observed.As the deformation temperature and strain rate increase,softening caused by metadynamic recrystallization is obvious.According to the data of thermo-simulation,the metadynamic recrystallization activation energy is obtained to be Qmd=100.674 kJ/mol and metadynamic recrystallization kinetics model is set up.Finally,the error analysis of metadynamic recrystallization kinetics model proves that the model has high accuracy(correlation coefficient R=0.988 6).Based on the steady-state strain measured by single-pass hot compression tests, the method by a double-pass hot compression testing was developed to measure the metadynamic-recrystallization kinetics. The metadynamic recrystallization behavior of low-alloy steel Q345B during hot compression deformation was investigated in the temperature range of 1 000-1 100 ℃, the strain rate range of 0.01-0.10 s^-1 and the interpass time range of 0.5-50 s on a Gleeble-3500 thermo-simulation machine. The results show that metadynamic recrystallization during the interpass time can be observed. As the deformation temperature and strain rate increase, softening caused by metadynamic recrystallization is obvious. According to the data of thermo-simulation, the metadynamic recrystallization activation energy is obtained to be Qmd=100.674 kJ/mol and metadynamic recrystallization kinetics model is set up. Finally, the error analysis of metadynamic recrystallization kinetics model proves that the model has high accuracy （correlation coefficient R=0.988 6）.

关 键 词：low-alloy steel kinetics model hot deformation metadynamic recrystallization activation energy 

分 类 号：TG142.1[一般工业技术—材料科学与工程]