利用Gleeble-3500型热模拟试验机，研究了 M50NiL 齿轮钢在变形温度为1123．15~1423．15 K、应变速率为0．005~10 s－1条件下的变形行为，并对实测流变曲线进行了摩擦修正；基于应变速率和变形温度对金属高温变形的耦合效应，建立了基于Johnson-Cook(J-C)模型的耦合流变应力本构方程并进行了验证.结果表明：对试验钢流变曲线摩擦修正后，得到的流变应力比实测值小；经变形参数耦合修正后的J-C耦合本构方程计算得到的流变应力与摩擦修正后流变应力的平均相对误差为3．08％，其预测精度高于传统J-C本构方程(平均相对误差为14．31％)的.
The deformation behavior of M50NiL gear steel was investigated at the deformation temperatures of 1 123.15-1 423.15 K and strain rates of 0.005-10 s-1 by using Gleeble-3500 thermal simulator.The measured flow curves were friction-corrected.On account of the coupling effect of the strain rate and deformation temperature on the metal hot deformation,the coupling constitutive equation for flow stress prediction was established based on Johnson-Cook (J-C)model and verified.The results show that after the flow curve of the tested steel was friction-corrected,the obtained flow stresses were lower than the measured values.The average relative error between the calculated flow stress by the J-C equation after coupling correction with the deformation parameters and the friction-corrected flow stress was 3.08%,indicating the higher prediction accuracy than that of the traditional equation (the average relative error was 14.31%).
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