利用Gleeble-3800热模拟机对TC4钛合金在550~800℃温区进行热变形试验研究。通过真应力、真应变分析得到TC4钛合金峰值应力随温度升高而降低、应变速率增大而升高，确定了550~800℃温区热变形激活能、建立了流变应力本构关系以及峰值应力与温度和变形速率之间的函数关系。通过热变形模拟为TC4钛合金热加工参数的合理制定与控制提供依据。
The hot deformation tests were carried out by Gleeble?3800 thermal simulator on TC4 titanium alloy at deformation temperature 550 to 800 ℃. The analysis of stress?strain curves of TC4 titanium alloy shows that the peak stress increases with decreasing the deformation temperature and increasing the strain rate. The hot deformation activation energy for temperature 550 to 800 ℃,constitutive relation,the relation between peak stress and deformation temperature and strain rate are obtained for annealed TC4 titanium alloy. Thermal deformation simulation can provide basis for choosing hot working parameters of TC4 titanium alloy.
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