Study on Hot Deformation Behavior of TC4-DT Titanium Alloy
The hot deformation behavior of TC4-DT alloy was investigated by Gleeble-1500 simulator at the deformation degree of 0.5, the temperature range from 750 ℃ to 950 ℃ and the strain rate range from 0.001 s-1 to 10 s -1. The laws of microstructure evolvement and the characteristic of flow stress were analyzed, the constitutive equation was presented. The results indicate that the flow stress rises with strain rate increasing and temperature decreasing. The microstructure evolvement is severely affected by temperature and strain rate, the globularing processes is more and more apparent with temperature increasing and strain rate decreasing. The strain rate sensitivity exponent (m) is going up with temperature increasing. The hot deformation activation energy (Q) is 603.51 kJ/mol, which shows that the deformation of TC4-DT alloy isn't controlled by high temperature diffusing processes, and the dynamic recrystallization occurs.