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通过TC4-DT钛合金在1181~1341 K,0.01~10 s~(-1)条件下热模拟压缩试验,得到其在不同条件下高温变形真应力-真应变曲线。采用回归分析和多项式拟合建立了应变补偿高温变形本构方程。结果表明:各变形条件下的流变应力曲线均呈现应变硬化和流动软化,低温高应变速率特征更明显。当应变速率低于1 s~(-1)时,预测值与实验值吻合程度较高,相关系数和平均相对误差绝对值分别为0.9952和5.78%,此修正模型可作为TC4-DT钛合金高温变形本构方程。
The true stress-strain curves of TC4-DT titanium alloy were obtained under the conditions of 1181 ~ 1341 K and 0.01 ~ 10 s ~ (-1) under high temperature deformation under different conditions. Strain compensation high temperature deformation constitutive equation was established by regression analysis and polynomial fitting. The results show that the rheological stress curves show strain hardening and flow softening under all deformation conditions, and the characteristics of strain rate at high temperature and low strain are more obvious. When the strain rate is lower than 1 s -1, the predicted value is in good agreement with the experimental value, and the absolute value of the correlation coefficient and the average relative error are 0.9952 and 5.78% respectively. This modified model can be used as TC4-DT titanium alloy at high temperature Deformation constitutive equation.