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采用Gleeble-1500D热模拟试验机进行热压缩实验,研究了TC4-DT钛合金在温度850~980℃、应变速率为0.001~10 s-1、变形量为50%条件下的热变形行为。根据应力–应变曲线分析了该合金的流变应力变化特点,建立了该合金的Arrhenius型本构方程及加工图。结果表明:流变应力随变形温度降低及应变速率增大而升高;变形温度与应变速率对TC4-DT合金应力影响显著;本实验测得的平均激活能为587.2 kJ/mol;该合金合适的加工条件为<0.6 s-1,温度大于850℃。
Hot compression tests were carried out on a Gleeble-1500D thermal simulator to study the thermal deformation behavior of TC4-DT titanium alloy at a temperature of 850-980 ℃ and a strain rate of 0.001-10 s-1 with a deformation of 50%. According to the stress-strain curve, the change of the flow stress of the alloy was analyzed, and the Arrhenius-type constitutive equation and the processing diagram of the alloy were established. The results show that the flow stress increases with the decrease of the deformation temperature and the strain rate. The deformation temperature and strain rate have significant influence on the stress of TC4-DT alloy. The average activation energy measured in this experiment is 587.2 kJ / mol. The processing conditions of <0.6 s-1, the temperature is greater than 850 ℃.