锻压技术

铸态30Cr2Ni4MoV转子钢基于应变补偿法的高温本构模型

英文标题：High temperature constitutive model on as-cast rotor steel 30Cr2Ni4MoV based on strain compensation method

作者：赵宇徐月张秀芝

关键词：铸态30Cr2Ni4MoV钢应变补偿流动应力单道次热压缩高温热变形本构模型

分类号：TG316

出版年,卷(期):页码：2020,45(11):193-198

摘要：

通过Gleeble-1500D热模拟实验机，对铸态30Cr2Ni4MoV钢进行了高温压缩实验，探索了铸态30Cr2Ni4MoV钢在变形温度为900~1200 ℃、应变速率为0.001~1 s-1时的高温热变形行为。对实验结果进行讨论可知，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，其中，应变对流动应力的影响最大。所以，在传统的Arrhenius本构模型的基础上，引入应变对流动应力的影响，采用五阶多项式对应变对流动应力的影响进行了描述，建立了基于应变补偿法的铸态30Cr2Ni4MoV钢的本构模型。最后，通过相关系数R和平均相对误差AARE对本模型的精确性进行了评估，计算得出R值为0.992,AARE值仅为4.11%，证明了修正后的模型对于预测该种材料的流动应力具有较高的精度

The high temperature compression experiment of as-cast 30Cr2Ni4MoV steel was conducted by Gleeble-1500D thermal simulator, and the high temperature thermal deformation behavior of as-cast 30Cr2Ni4MoV steel was investigated under the deformation temperatures of 900-1200 ℃ and the strain rates of 0.001-1 s-1. The experimental results show that the flow stress of material is affected by the deformation temperature, strain rate and strain, and the strain has the greatest influence on the flow stress. Then, based on the traditional Arrhenius constitutive model, the influence of strain on the flow stress is introduced and it is described by a fifth-order polynomial. Furthermore, the constitutive model of as-cast 30Cr2Ni4MoV steel is established based on the strain compensation method. Finally, the accuracy of this model is evaluated by correlation coefficient R and average absolute relative error AARE, and the calculated values of R and AARE are 0.992 and 4.11%, respectively. Thus, it is proved that the modified model has high accuracy in predicting the flow stress of as-cast 30Cr2Ni4MoV steel．

基金项目：

国家自然科学基金资助项目（51775361）

赵宇（1996-），男，硕士研究生；E-mail：zy13934038594@163.com；通讯作者：张秀芝（1973-），女，博士，教授 E-mail: zhangxiuzhi@tyust.edu.cn

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