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建立合适的本构模型预测IMI834钛合金在α+β区的热拉伸流变行为。热拉伸实验在温度为800~1025°C、应变速率为0.001~0.1 s-1条件下进行。此本构模型通过Arrhenius型方程来表征应变为0.08~0.22时合金的热拉伸行为。结果表明,在不同应变条件下IMI834钛合金的热拉伸变形激活能范围为519~557 k J/mol。利用标准统计参数估算预测合金流变应力曲线的精度。所预测的合金的流变应力曲线与实验结果十分吻合。
A suitable constitutive model was established to predict the hot tensile rheological behavior of IMI834 titanium alloy in α + β region. The hot tensile test is carried out at a temperature of 800 to 1025 ° C and a strain rate of 0.001 to 0.1 s-1. This constitutive model characterizes the hot tensile behavior of alloys with strain of 0.08-0.22 through the Arrhenius equation. The results show that the activation energy of hot tensile deformation of IMI834 titanium alloy is 519 ~ 557 kJ / mol under different strain conditions. Estimating the accuracy of flow stress curves of alloys using standard statistical parameters. The predicted flow stress curves for the alloy are in good agreement with the experimental results.