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采用等温热压缩试验研究2099合金在变形温度300~500°C、应变速率0.001~10 s-1条件下的热变形行为。为了准确地表征流变行为,采用摩擦与温度修正后的实验数据构建本构模型。结果表明,温度和应变速率对合金热变形行为的影响可用包含Arrhenius关系的Z参数来表征。此外,通过计算不同应变量下的材料常数(α、n、Q和A)考虑了应变对本构模型的影响。利用统计分析对比了由本构模型获得的预测曲线与试验修正曲线,二者显示了很好的吻合,这表明所构建的本构模型能够很好地预测2099合金的热变形流变行为。
The isothermal hot compression test was used to study the thermal deformation behavior of 2099 alloy under the conditions of deformation temperature of 300 ~ 500 ° C and strain rate of 0.001 ~ 10 s-1. In order to accurately characterize the rheological behavior, the friction and temperature-corrected experimental data were used to construct the constitutive model. The results show that the influence of temperature and strain rate on the hot deformation behavior of alloys can be characterized by the Z parameter including the Arrhenius relation. In addition, the influence of strain on the constitutive model is taken into account by calculating the material constants (α, n, Q and A) for different strain quantities. The statistical analysis was used to compare the predicted curves obtained with the constitutive model with the experimental correction curves, which showed good agreement. This indicates that the constitutive model can predict the hot deformation rheological behavior of 2099 alloy well.