TC21 钛合金高温变形本构方程研究

目的研究变形温度、应变速率等热力参数对TC21钛合金流动应力的影响规律,并构建出TC21钛合金本构方程。方法在热模拟试验机上对TC21钛合金进行了等温恒应变速率压缩实验,分析其真应力-真应变曲线。结果获得了该合金在变形温度范围为760~920℃、应变速率范围为0.001~10 s-1的流动应力数据,采用多元线性回归法建立了该合金的本构方程。结论误差分析表明,该本构方程具有较高精度,可为TC21钛合金锻造过程中的数值模拟和锻造热力参数的合理制定提供理论依据。

Constitutive Equation of Titanium Alloy TC21 Deformation at High Temperature

Objective To study the influence of thermomechanical parameters such as deformation temperature and strain rate on the flow stress of titanium alloy TC21 and to construct the constitutive equation of titanium alloy TC21. Meth-ods Isothermal constant strain rate compression experiment of titanium alloy TC21 was carried out with a hot working simu-lator, and the true stress-strain curves were analyzed. Results The flow stress data of the alloy in the temperature range of 760 ～ 920 ℃ and the strain rate range of 0. 001 ～ 10 s^-1 were obtained, and the constitutive equation of the titanium alloy was constructed by Multiple Linear Regression. Conclusion Error analysis showed that the constitutive equation had high precision, which could provide theoretical basis for numerical simulation and determination of the reasonable thermome-chanical parameters during the forging process of titanium alloy TC21.