Characterization of Hot Deformation Behavior of TC4-DT Titanium Alloy

摘要

The hot deformation behavior of TC4-DT alloy was investigated using a hot Gleeble-1500D thermal simulator in the temperature range of 908 °C ～1038 °C and at constant strain rate from 0.01s~(-1) to 10s~(-1). Flow behavior of TC4-DT alloy was discussed. The deformation activation energy was calculated. Processing map of TC4-DT alloy was established. The results indicate that the hot deformation behavior of TC4-DT alloy is sensitive to the deformation temperature and strain rate. The peak flow stress decreases with the increase of the test temperature and decrease of the strain rate. A constitutive equation was constructed as a function of temperature and strain rate, and the activation energy of deformation was estimated to be 685KJ/mol in the α+β phase region and 242KJ/mol in β phase region, respectively. The processing map is generated at the true strain of 0.7, which shows that the peak efficiency domain appears at the temperature of 965°C and the strain rate of 0.01~(-1) with a peak efficiency of 54%.