Transactions of Materials and Heat Treatment

Title：Influence of process parameters and dynamic recrystallization on void evolution and analysis on microscopic damage mechanism for as-cast 42CrMo steel in high temperature tensile deformation

Authors： Chen Yuanyuan1 Qi Huiping2 Li Yongtang2 Liu Huiling1

Unit： 1. College of Mechanical Engineering Jinzhong University 2. College of Materials Science and Engineering Taiyuan University of Science and Technology

KeyWords： as-cast 42CrMo steel dynamic recrystallization fracture microstructure void evolution inclusion

ClassificationCode：TG333

year,vol(issue):pagenumber：2023,48(8):243-252

Abstract：

The high-temperature tensile experiments of as-cast 42CrMo steel were conducted by thermal simulation experimental machine, and the relationships between microstructures at the fracture and near the fracture, void evolution and temperature, strain rate and strain were analyzed. Then, the influences of process parameters and dynamic recrystallization behavior on void evolution were discussed, and the microscopic damage mechanism of as-cast 42CrMo steel was studied. The results show that the initiation, growth and aggregation of viods in the high-temperature tensile deformation can be inhibited by controlling the deformation temperature of as-cast 42CrMo steel at 1423-1473 K and controlling the strain rate and strain. When dynamic recrystallization behavior occurs, the micro-voids are not easy to nucleate and grow, the spacing of aggregation between voids is reduced, and the fracture strain is increased. In the process of high-temperature tensile deformation of as-cast 42CrMo steel,the fall off or break of inclusions such as silica oxide, manganese sulfide, aluminum oxide and calcium oxide leads to void nucleation, and the nucleation can also occur between martensite grains.

Funds：

国家自然科学基金资助项目（51875383,51575371）；山西省高校科技创新项目（2020L0579）

作者简介：陈园园（1983-），女，博士，讲师,E-mail：123042922@qq.com;通信作者：齐会萍（1974-），女，博士，教授,E-mail：qhp9974@tyust.edu.cn

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