锻压技术

铸态316LN钢基于应变补偿的本构模型

英文标题：Constitutive model of cast 316LN steel based on strain compensation

作者：李景丹刘建生任树兰

单位：太原科技大学

分类号：TG316

出版年,卷(期):页码：2019,44(4):176-181

摘要：

采用Gleeble-1500D热模拟实验机，对铸态316LN不锈钢进行了高温压缩实验，根据铸态316LN不锈钢在变形温度为900~1200 ℃、应变速率为0.001~1 s-1、变形量为55%下的高温压缩实验结果可知，该材料的流动应力受变形温度、应变速率和应变的共同影响。因此，在传统Arrhenius本构模型基础上，引入了应变对流动应力的影响。通过五阶多项式描述了应变与材料参数的关系，建立了基于应变补偿法的铸态316LN不锈钢的本构模型。通过引入相关系数R、平均相对误差AARE，对该模型进行了评估，对比该模型的预测值与实验值的结果后得出，R值为0.995，AARE值仅为4.48%，证明了采用修正后的模型预测该类材料的流动应力具有较高的精度。

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.

基金项目：

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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