GH4169稀土强化镍基高温合金热变形行为

Hot deformation behavior of GH4169 rare earth reinforced Ni-base superalloy

采用Gleeble-3500热模拟试验机对GH4169稀土强化镍基高温合金进行了高温压缩试验,变形温度为1223、1273、1323、1373和1423 K,应变速率为0.001、0.01、0.1、1和10 s^(-1),压下量为65%。分析了GH4169稀土强化镍基高温合金在不同变形条件下的流变应力曲线,并采用正交试验和方差分析方法得出真应变、应变速率以及变形温度对流动应力的影响规律。建立了GH4169稀土强化镍基高温合金的修正非线性回归模型,引入相关系数和平均相对误差,验证了所建立的本构模型的有效性。结果表明:该模型能够较准确地描述GH4169稀土强化镍基高温合金的高温流变行为。

The high temperature compression tests of GH4169 rare earth reinforced Ni-base superalloy were carried out by Gleeble-3500 thermo-mechanical simulator,with deformation temperatures of 1223,1273,1323,1373 and 1423 K,strain rates of 0.001,0.01,0.1,1 and 10 s^(-1),and the reduction of 65%.The flow stress curves of GH4169 rare earth reinforced Ni-base superalloy under different deformation conditions were analyzed,and the effects of true strain,strain rate and deformation temperature on flow stress were obtained by orthogonal test and variance analysis method.The modified nonlinear regression model of GH4169 rare earth reinforced Ni-base superalloy was established,and the correlation coefficient and average absolute relative error were introduced to verify the validity of the established constitutive equation method.The results show that the model can accurately describe the high temperature flow behavior of GH4169 rare earth reinforced Ni-base superalloy.