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通过高温拉伸实验研究了初始δ相(Ni_3Nb)含量对一种镍基合金高温拉伸变形行为和材料参数的影响。研究结果表明,初始δ相含量、变形温度、应变速率和应变对镍基合金高温拉伸变形行为的影响十分显著。基于实验结果,建立了一种修正的Arrhenius本构模型,其模型的材料参数表达为初始δ相含量和应变的函数关系。该模型可以描述初始δ相含量、变形温度、应变速率和应变对镍基合金高温拉伸变形行为的综合影响。通过比较,模型预测值与实验值吻合,证实了建立的本构模型可精确地预测镍基合金的高温拉伸变形行为。
The effect of initial δ-phase (Ni_3Nb) content on the tensile deformation behavior and material parameters of a nickel-based alloy at high temperature was studied by high-temperature tensile test. The results show that the effect of initial δ phase content, deformation temperature, strain rate and strain on the tensile deformation behavior of nickel-based alloys at high temperature is significant. Based on the experimental results, a modified Arrhenius constitutive model is established. The material parameters of the model are expressed as a function of initial δ phase content and strain. The model can describe the initial influence of δ content, deformation temperature, strain rate and strain on the tensile deformation behavior of Ni-based alloys at high temperature. By comparison, the predicted values of the model are in good agreement with the experimental values, which confirms that the established constitutive model can accurately predict the high temperature tensile deformation behavior of Ni-based alloys.