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使用Gleeble-3800型热加工模拟实验机,在温度1000~1200℃、应变速率1~80 s-1、最大变形程度为70%的条件下对IN690高温合金的流动应力进行高温等应变压缩实验。分析了流动应力与工艺参数之间的关系,并基于Arrhenius方程对所得的实验数据进行处理,构建出了该材料的本构关系方程。误差分析结果表明,该本构方程最大相对误差为18.1%,平均相对误差为8.2%,具有较好的精度,可适用于实际应用。同时通过线性回归的方法计算出该材料的应变激活能、应力指数等数值,为IN690高温合金数值模拟提供参考。
The flow stress of IN690 superalloy was subjected to high-temperature isostatic compression at a temperature of 1000-1200 ℃, a strain rate of 1-80 s-1 and a maximum deformation of 70% using a Gleeble-3800 thermal processing simulation machine. The relationship between the flow stress and the process parameters was analyzed. The experimental data were processed based on the Arrhenius equation, and the constitutive equation of the material was constructed. The results of error analysis show that the maximum relative error of the constitutive equation is 18.1% and the average relative error is 8.2%. It has better accuracy and is suitable for practical application. At the same time, the values of strain activation energy and stress index of the material were calculated by the linear regression method, which provided a reference for the numerical simulation of IN690 superalloy.