Transactions of Materials and Heat Treatment

Title：Deformation behavior at high temperature and establishment of constitutive model of GGG70L ductile iron

Authors： Ding Huiying Guan Yanjin Li Yuqi Zhai Jiqiang Lin Jun

Unit： Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University

KeyWords： GGG70L ductile iron deformation behavior constitutive model laser surface quenching stress-strain field

ClassificationCode：TG143.5; TG155.5

year,vol(issue):pagenumber：2022,47(12):249-255

Abstract：

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.

Funds：

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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