Transactions of Materials and Heat Treatment

Title：Influence of laser heat treatment on microstructure and properties for 7CrSiMnMoV die steel

Authors： Liu Yubing1 Guan Yanjin1 Li Yuqi1 Chu Hongqiang1 Lin Jun1 Xu Shanjun2 Wang Wenming2 Ren Qihua2

Unit： 1. Shandong University 2. Shandong Wenling Precision Forging Technology Co. Ltd.

KeyWords： 7CrSiMnMoV die steel laser heat treatment surface hardening wear resistance microstructure

ClassificationCode：TG143.5; TG155.5

year,vol(issue):pagenumber：2023,48(11):185-195

Abstract：

Laser heat treatment is an efficient and clean surface strengthening process. For 7CrSiMnMoV die steel, laser heat treatment process experiments with different process parameters were conducted, and the influence laws of laser power and laser scanning speed on the microstructure and properties of hardened layer were studied. The results show that a large amount of acicular martensite is produced in 7CrSiMnMoV die steel from the surface layer to the hardened layer and the heat-affected layer, and the martensite content and its grain size decreases with the increasing of layer depth. By controlling the laser energy density, the material can obtain a hardened layer with a certain depth, and the relation formulas between hardened layer depth and laser energy density is obtained by fitting to realize the prediction of the hardened layer depth. Through room temperature friction and wear experiments, it is found that the wear resistance of quenched sample is significantly enhanced, and the wear resistance of sample improves with the increasing of laser energy density.

Funds：

国家重点研发计划（2020YFB2010301）

作者简介：刘玉冰（1999-），女，硕士研究生，E-mail：202134178@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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