Hot Deformation Behaviors and Processing Map of TA17 Titanium Alloy

In order to study the hot deformation behaviors and deformation characteristics of TA17 titanium alloy,the thermal compression experiments were carried out on Gleeble-3800 thermal simulator at the deformation temperature ranging from 700 to 1 100 ℃,strain rate ranging from 0. 1 to 40 s^-1 with 60%height reduction of the specimen.The constitutive equation of TA17 titanium alloy was established based on the Arrhenius model,and the hot processing map of the alloy,which was verified by microstructure analysis for the samples,was established based on the Dynamic Materials Model （ε = 0. 6）. The results show that the predicted results by the hot processing map are in accordance with the microstructure analysis,indicating that the instable zones for TA17 processing locate in areas where the temperature is below 750 ℃ or the strain rate is higher than 10 s^-1, and the safe processing zones are outside the instable ones with 800 ℃ and 0.1 s^-1 for the processing zone possessing the best hot working performance.