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为探索TA17钛合金热变形行为和变形特性,采用Gleeble-3800热模拟机开展温度为700~1 100℃、应变速率为0.1~40 s~(-1)、变形程度为60%的热压缩试验。基于Arrhenius模型构建TA17钛合金的本构方程,基于动态材料模型构建TA17钛合金的热加工图(ε=0.6),并结合显微组织分析对热加工图进行验证。结果表明:热加工图预测结果与组织分析相符,当温度低于750℃或者应变速率大于10 s~(-1)的区域为TA17钛合金的加工失稳区域,失稳区以外是安全加工区域,热加工性能最佳的区域是800℃、0.1 s~(-1)。
In order to explore the thermal deformation behavior and deformation characteristics of TA17 titanium alloy, hot compressing test was carried out on a Gleeble-3800 thermal simulator at a temperature of 700-1 100 ℃ with a strain rate of 0.1-40 s -1 and a deformation degree of 60% . Based on the Arrhenius model, the constitutive equation of TA17 titanium alloy was built. The hot working diagram of TA17 titanium alloy (ε = 0.6) was constructed based on the dynamic material model. The hot working diagram was verified with the microstructure analysis. The results show that the predicted results of the hot working drawing are in good agreement with the microstructure analysis. When the temperature is lower than 750 ℃ or the strain rate is more than 10 s ~ (-1), the machined unstable region of TA17 titanium alloy is beyond the unstable working region , The best hot working area is 800 ℃, 0.1 s ~ (-1).