摘要
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 investigated by using Gleeble-3500 thermal-simulation machine at the deformation temperature of 970-1180 ℃ and strain rate of 0.01-10 s-1. The constitutive equation was established by using Arrhenius hyperbolic sine model. The material parameters in the constitutive equation were modified. The flow stress of spray formed CPM9V high speed steel was predicted by the modified constitutive equation. The results show that dynamic recrystallization and dynamic recovery appear during the hot deformation, and the flow stress increases with the strain rate increasing, and decreases with the temperature increasing. The predicted values of the constitutive equation and experimental values are in good agree ment. And the correlation coefficient is R=0.9976, and the absolute value of average relative error is 3.157%.
出处
《热加工工艺》
CSCD
北大核心
2017年第7期135-140,共6页
Hot Working Technology
基金
国家自然科学青年基金项目(51301143)
中国博士后面上项目(2014M560727)
四川省科技支撑计划(2015GZ0228)
西南交通大学科技创新项目(2682014CX001)
关键词
喷射成形
CPM9V高速钢
热变形
本构模型
预测
spray forming
CPM9V high speed steel
hot deformation
constitutive model
prediction
