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采用Gleeble-3500热模拟试验机在变形温度970~1180℃和应变速率0.01~10 s~(-1)下对喷射成形CPM9V高速钢进行了热压缩变形行为研究。基于Arrhenius双曲正弦模型,建立了喷射成形CPM9V高速钢的本构方程,并对本构方程中材料参数进行了修正。通过修正的本构方程预测了喷射成形的CPM9V高速钢的流动应力。结果表明:在热变形过程中出现动态再结晶和动态回复,流变应力随应变速率增大而增大,随温度增大而减小。本构模型的预测值和试验值吻合较好,且相关系数R=0.9976,平均相对误差绝对值为3.157%。
The hot compression deformation behavior of spray-formed CPM9V high-speed steel was studied by Gleeble-3500 thermal simulation machine at deformation temperature of 970 ~ 1180 ℃ and strain rate of 0.01 ~ 10 s ~ (-1). Based on the Arrhenius hyperbolic sine model, the constitutive equations of spray-formed CPM9V high-speed steel were established and the material parameters in the constitutive equation were modified. Through the modified constitutive equation, the flow stress of spray formed CPM9V HSS was predicted. The results show that dynamic recrystallization and dynamic recovery occur during hot deformation. The flow stress increases with strain rate and decreases with increasing temperature. The predictive value of the constitutive model is in good agreement with the experimental value, and the correlation coefficient R = 0.9976, the average relative error is 3.157%.