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在Gleeble-3500热/力模拟试验机上对轧态Ni-40Ti形状记忆合金进行等温恒应变速率拉伸试验,研究了变形温度为650~850℃,应变速率为0.01~1.00s~(-1)条件下合金的热变形行为。结果表明,应变速率和变形温度对流变应力具有显著影响,合金流变应力随着变形温度升高和应变速率降低而降低。基于Arrhenius方程和多元线性回归法构建了合金本构关系模型。误差分析表明,采用Arrhenius方程预测轧态Ni-40Ti合金的热拉伸变形行为存在较大误差;而采用多元线性回归法建立的本构模型能较准确预测轧态Ni-40Ti合金的热拉伸变形行为,流变应力预测值与试验值符合较好。
The isothermal constant strain rate tensile test of Ni-40Ti shape memory alloy was carried out on Gleeble-3500 thermal / mechanical simulator. The deformation temperature was 650-850 ℃ and the strain rate was 0.01-1.00 s -1 Thermal Deformation Behavior of Alloy. The results show that the strain rate and deformation temperature have a significant effect on the flow stress. The flow stress of the alloy decreases with the increase of the deformation temperature and the decrease of the strain rate. Based on the Arrhenius equation and multiple linear regression method, the constitutive model of the alloy was established. The error analysis shows that the Arrhenius equation is used to predict the hot tensile deformation behavior of Ni-40Ti alloy under rolling conditions. However, the constitutive model established by multivariate linear regression method can predict the hot drawing of Ni-40Ti alloy Deformation behavior, the predicted value of the flow stress in good agreement with the test value.