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采用Gleeble-1500热模拟实验机研究了Incoloy 800H合金在变形温度为1273-1473 K和应变速率为0.01-10 s~(-1)条件下的流动应力行为.采用双曲正弦函数建立了Incoloy 800H高温条件下的流动应力本构方程,以六次多项式考虑了应变量耦合因素对本构关系的影响.研究结果表明,Incoloy 800H在热压缩变形过程中,低应变速率和高应变速率条件下分别呈动态软化和动态回复特征,流动应力随应变速率的增加而增加,随温度的升高而降低;采用应变的六次多项式拟合得到的本构关系流动应力预测值与实验值吻合较好,绝大多数(95%)情况下预测的误差小于6.5%,平均相对误差仅为3.15%.
The flow stress behavior of Incoloy 800H alloy under deformation temperature of 1273-1473 K and strain rate of 0.01-10 s ~ (-1) was investigated by using Gleeble-1500 thermal simulator. Incoloy 800H The constitutive equation of flow stress under high temperature is studied by six degree polynomial, and the effect of coupling factor of strain on the constitutive relationship is considered. The results show that Incoloy 800H has the characteristics of low strain rate and high strain rate The dynamic softening and dynamic recovery characteristics show that the flow stress increases with the increase of strain rate and decreases with the increase of temperature. The predicted value of the flow stress in the constitutive relationship fitted by the sixth order polynomial strain is in good agreement with the experimental data. In the vast majority (95%), the predicted error is less than 6.5% and the average relative error is only 3.15%.