锻压技术

GGG70L球墨铸铁的高温变形行为及其本构模型建立

英文标题：Deformation behavior at high temperature and establishment of constitutive model of GGG70L ductile iron

作者：丁慧莹管延锦李玉琦翟继强林军

分类号：TG143.5; TG155.5

出版年,卷(期):页码：2022,47(12):249-255

摘要：

为了准确获取GGG70L球墨铸铁的本构模型，实现激光表面淬火过程的数值模拟和热处理变形分析，在800~1100 ℃变形温度下分别进行了变形速率为0.01、0.1、1 和10 s-1的热模拟实验，研究了GGG70L球墨铸铁的变形行为，并基于J-C优化模型及应变补偿型的Arrhenius模型分别建立了GGG70L球墨铸铁的本构模型。结果表明：GGG70L球墨铸铁的软化作用与温度和应变速率呈负相关关系；加工硬化作用与温度呈负相关关系，而与应变速率呈正相关关系。基于应变补偿型的Arrhenius模型的拟合效果较好，平均相对误差仅为5.11%，能够较为准确地描述GGG70L球墨铸铁的变形行为，为研究GGG70L球墨铸铁激光表面淬火过程的应力-应变场的数值模拟奠定了基础。

In order to obtain the constitutive model of GGG70L ductile iron accurately, realize the numerical simulation of laser surface quenching process and the deformation analysis of heat treatment, the thermal simulation experiments with the deformation rates of 0.01, 0.1, 1 and 10 s-1 at the deformation temperatures of 800-1100 ℃ were conducted, and the deformation behavior of GGG70L ductile iron was studied. Then, the constitutive model of GGG70L ductile iron was established based on the J-C optimization model and the strain-compensated Arrhenius model. The results show that the softening effect of GGG70L ductile iron has a negative correlation with temperature and strain rate, and the work hardening effect has a negative correlation with temperature and a positive correlation with strain rate. The fitting effect based on the strain-compensated Arrhenius model is better, and the average relative error is only 5.11%, which describes the deformation behavior of GGG70L ductile iron more accurately and lays the foundation for the numerical simulation of stress-strain field in the laser surface quenching process of GGG70L ductile iron.

基金项目：

国家重点研发计划（2020YFB2020301）

丁慧莹（1998-），女，硕士研究生 E-mail：202014092@mail.sdu.edu.cn 通信作者：管延锦(1969-)，男，博士，教授 E-mail：guan_yanjin@sdu.edu.cn

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