High Temperature Flow Behavior and Microstructure Evolution of TC31 Titanium Alloy Sheets

The high temperature flow behavior of TC31 titanium alloy at 840 similar to 960 degrees C and 0.0001 similar to 0.1 s(-1) was investigated and the effects of the deformation temperature, strain rate and strain on flow stress and microstructure were studied. The Arrhenius constitutive equation of TC31 titanium alloy was established and verified. The results show that when the temperature is lower than 880 degrees C and the strain rate is higher than 0.01 the material exhibits obvious dynamic softening. When the temperature is higher than 920 degrees C and the strain rate is lower than 0.001 s(-1), the coarse grain increases flow stress. It is indicated that the strain, strain rate and deformation temperature have different effects on grain size, shape and phase content. In addition, it is confirmed that the strain-corrected Arrhenius constitutive equation has higher prediction accuracy, and its MSE is 4.173 and the R value is 0.9698.