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在Gleebe-3800热模拟机上对904L超级奥氏体不锈钢进行等温热压缩实验,实验温度为1 000℃~1 150℃,应变为0~0.8,应变速率为0.01s~(-1)~10s~(-1)。利用所得的应力应变值确定不同类型Johnson-Cook本构模型的材料参数。结果表明,3种模型中,最高相关系数为0.966,最低的平均相对误差为5.39%;对于实验值和预测值的吻合程度,低应变速率比高应变速率高。说明在应变速率较低时,本构模型能更有效的反映904L超级奥氏体不锈钢的高温动态流变应力;最佳的应力-应变关系是二次函数关系,变形温度、应变速率与流变行为关系是耦合关系。
The isothermal hot compression tests of 904L super austenitic stainless steel were carried out on a Gleebe-3800 thermal simulator at a temperature of 1 000 ℃ ~ 1 150 ℃, strain of 0 ~ 0.8 and strain rate of 0.01s ~ (-1) ~ 10s ~ (-1). The material parameters of different types of Johnson-Cook constitutive models are determined using the resulting stress-strain values. The results showed that the highest correlation coefficient of the three models was 0.966, and the lowest average relative error was 5.39%. For the agreement between experimental and predicted values, the low strain rate was higher than the high strain rate. It shows that the constitutive model can more effectively reflect the high temperature dynamic flow stress of 904L super austenitic stainless steel at low strain rate. The best stress-strain relation is quadratic function, deformation temperature, strain rate and rheology Behavioral relationship is the coupling relationship.