Effect of Deformation on Phase Transition and Recrystallization During Thermal Compression of TA2 Pure Titanium
Gleeble-1500 thermodynamic simulation test machine was used to perform thermal compression deformation on TA2 pure titanium at a deformation rate of 10 s-1 before and after the phase change point,and the influence of thermal compression on the phase transition was studied.It is found that when the deformation is near the phase transition point,the phase transition first occurs between the slats,and the newly formed β grains are mostly spherical or short rod-like.As the amount of compression increases,adjacent β nuclei gradually connect and become strip-like structure.There is a critical value for phase transition.When the compression temperature is 860,890 and 920 ℃ and the compression amount reaches 40％,30％and 20％,respectively,the phase transition tends to saturate,and a large number of dynamic recrystallization occurs.The temperature rise effect has little effect on the phase transition,and when the deformation is large,the temperature rise effect increases correspondingly,and the number of dynamic recrystallization increases significantly,but the phase transition hardly occurs.The higher the temperature,the more obvious the phenomenon of deformation promoting phase change.When the compression temperature is after the phase change point,a small amount of compression can make a large number of phase transitions occur.
NETL
NSTL
万方数据
