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采用Gleeble-3800热模拟机对一种纯钛TA1进行了等温等应变速率热压缩试验,变形温度范围为650~850℃,应变速率范围为1~20 s~(-1),变形量为60%。研究结果表明:纯钛的流变应力随变形温度升高而降低,随应变速率升高而升高;采用Arrhenius本构模型构建了纯钛的本构方程,该方程可为纯钛热加工的数值模拟提供模型参考;根据动态材料模型构建了纯钛的热加工图,并通过纯钛的显微组织对热加工图进行了验证,结果表明纯钛热加工图的预测与组织演变规律一致。研究结果为纯钛热加工工艺的制定和优化提供了理论依据。
A kind of pure titanium TA1 was subjected to isothermal strain rate thermal compression test with Gleeble-3800 thermal simulator. The deformation temperature range was 650 ~ 850 ℃, the strain rate range was 1 ~ 20 s ~ (-1), deformation amount was 60 %. The results show that the flow stress of pure titanium decreases with the increase of deformation temperature and increases with the increase of strain rate. The constitutive equation of pure titanium is established by using Arrhenius constitutive model. The simulation provides the model reference. According to the dynamic material model, the thermal processing diagram of pure titanium is constructed, and the thermal processing diagram is verified by the microstructure of pure titanium. The results show that the prediction of thermal processing diagram of pure titanium is consistent with the evolution of microstructure. The results provide a theoretical basis for the formulation and optimization of pure titanium thermal processing technology.