Transactions of Materials and Heat Treatment

Title：Constitutive model of cast 316LN steel based on strain compensation

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ClassificationCode：TG316

year,vol(issue):pagenumber：2019,44(4):176-181

Abstract：

The high temperature compression experiment of cast 316LN stainless steel was conducted by Gleeble-1500D thermal simulator. According to the high compression experiment results of cast 316LN stainless steel with deformation temperature of 900-1200 ℃, strain rate of 0.001-1 s-1 and deformation amount of 55%, the flow stress of material was affected by deformation temperature, strain rate and strain. Therefore, based on the traditional Arrhenius constitutive model, the influence of strain on flow stress was introduced. Furthermore, the relationship between strain and material parameters was described by the fifth order polynomial, and the constitutive model of cast 316LN stainless steel based on strain compensation method was established. Finally, the model was evaluated by introducing correlation coefficient R and average relative error AARE. Comparing the predicted values of the model with the experimental values, the value of R is 0.995 and the value of AARE is only 4.48%, it is proved that the modified model has high accuracy in predicting the flow stress of this kind of material.

Funds：

国家自然科学基金资助项目（51775361）

李景丹（1989-），女，博士研究生 E-mail：929949477@qq.com 通讯作者：刘建生（1958-），男，博士，教授，博士生导师 E-mail：jiansliu@163.com

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