High Temperature Deformation Behavior and Constitutive Equation of Pure Titanium for Finish rolling

In order to study the effect of high temperature deformation parameters on the high temperature deformation behaviors of hot rolled pure titanium tape in finish rolling process,Gleeble -3800 thermal simulation machine was employed to the high temperature compressive test of pure titanium. According to the finishing process parameters for hot rolling pure titanium,hot compression temperature was set at the range of 700~800℃,strain rate was determined at the range of 0.01~10 s^-1 and the deformation degree was 80%. The results show that the flow stress of pure titanium decreases with the increasing deformation temperature and increases with the increasing strain rate,dynamic recovery occurs at 700~775 ℃ and dynamic recrystallization happens only under the condition of 800 ℃ and less than 1 s^-1 of strain rate. Based on the hyperbolic sine Arrhenius model,the constitutive equation of pure titanium was established by use of linear regression method,which provided a theoretical basis for the numerical simulation and thermal processing of pure titanium.