Constitutive equation for high temperature flow stress of 95CrMosteel

The flow stress curve of 95CrMo steel was studied by isothermal unidirectional heat compression test at 750-1050 with strain rates of 0.1, 1 and 10 s-1using Gleeble-3500 thermal-simulation machine. The results show that the influence of strain degree, deformation temperature and strain rate on the flow stress of 95CrMo steel is caused by dynamic recovery and dynamic recrystallization softening mechanism which is the result of the joint action of these three factors. According to the experimental results, a constitutive equation of flow stress of 95CrMo steel is established, which take the compensation of strain degree, deformation temperature and strain rate into account simultaneously. The correlation coefficient, average relative error and standard deviation of this equation are compared with that of the model of Zhou Jihua-Guan Kezhi. The results show that this constitutive equation is more accurate and more reliable than the model of ZhouJihua-GuanKezhi, it is more suitable for the numerical simulation field. ©, 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.