不同温度下IC10合金的本构关系

 利用材料试验机（MTS809）测得IC10合金在很宽的温度范围（25~800 ℃）和不同应变率（10^-5~10^-2s^-1）内的应力 应变曲线。试验结果表明：室温下IC10合金的流变行为对应变率不太敏感；相同应变率（10^-4s^-1）下，流变行为对温度较敏感；在不同应变率、25~800 ℃温度范围内，IC10合金的屈服应力变化很小。基于试验数据，修正并拟合了Johnson-Cook方程，并利用该方程对不同温度和不同应变率下IC10合金的流变应力进行预测。与试验数据对比表明，修正后的Johnson-Cook方程能较好地描述IC10合金在不同的温度和应变率条件下的流变行为。

Constitutive Analysis of Alloy IC10 at Different Temperatures

The tensile experiments were conducted over a wide range of temperatures (25-800℃) and strain rates (10^-5-10^-2s^-1) on material test system(MTS809) to investigate the flow behaviors of alloy IC10. Experiments show that: the flow behaviors are not sensitive to strain rates at ambient temperature; the flow behaviors are sensitive to the temperature at the same strain rate of 10^-4s^-1; the yield stress changes little with the variation of experimental conditions at the range of temperatures (25-800℃) and strain rate (10^-5-10^-2 s^-1).Based on the experiments,the Johnson-Cook equation is modified and fitted,and the modified Johnson-Cook equation is used to predict the flow behaviors at different strain rates and different temperatures.The comparisons between models and experiments show that the modified Johnson-Cook equation works well in real prediction.