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在Gleeble-3800热模拟机上对锻态β-CEZ钛合金在变形温度800~1000℃、应变速率0.01~10 s-1、变形程度70%的参数下进行了热模拟试验。根据真应力—真应变曲线研究了变形温度和应变速率对应力的影响,利用Arrhenius双曲正弦方程和Z参数建立了β-CEZ钛合金热变形本构方程。结果表明:β-CEZ钛合金的流变应力与变形速率成正比,与变形温度成反比;在试验条件下β-CEZ钛合金表现出动态回复和动态再结晶两种软化机制。误差分析表明,建立的热变形本构方程与试验值基本一致,能为β-CEZ钛合金有限元模拟及变形工艺选取提供理论依据。
The thermal simulation test was carried out on the Gleeble-3800 thermal simulator at the deformation temperature of 800 ~ 1000 ℃, strain rate of 0.01 ~ 10 s-1 and the degree of deformation of 70%. The effect of deformation temperature and strain rate on the stress was studied based on the true stress-true strain curve. The thermal deformation constitutive equation of β-CEZ titanium alloy was established by Arrhenius hyperbolic sine equation and Z parameter. The results show that the flow stress of β-CEZ titanium alloy is proportional to the deformation rate and inversely proportional to the deformation temperature. Β-CEZ titanium alloy shows two kinds of softening mechanism of dynamic recovery and dynamic recrystallization under the experimental conditions. Error analysis shows that the established thermal deformation constitutive equation is basically consistent with the experimental values, which can provide a theoretical basis for the finite element simulation of β-CEZ titanium alloy and the selection of the deformation process.