Transactions of Materials and Heat Treatment

Title：Influence of surface laser quenching on its microstructure and properties for P20 automobile die steel

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ClassificationCode：TG156. 34

year,vol(issue):pagenumber：2023,48(1):222-228

Abstract：

The surface heat treatment of P20 die steel was carried out by laser quenching technology. Then, the microstructure and friction and wear properties of quenched layer were studied, and the strengthening mechanism of the die steel by laser quenching technology was explained. The results show that the matrix is the decomposed pearlite, and the organization in quenched area for P20 die steel is acicular martensite and lath martensite, and with the increasing of laser power, the martensite structure coarsens. The solid solutions of (Cr, Fe) and (Mn, Fe) are mainly formed after quenching, and the solid solution strengthening is produced. The hardness of P20 die steel after laser quenching is greatly improved, the maximum hardness value is 520 HV, and the measured depth of the hardening layer is about 0. 93 mm. When the laser power is 1800 W, the wear rate of the quenched layer is only 0. 36%, and the friction coefficient is 0. 2013. The friction and wear mechanism of laser quenching for P20 die steel is abrasive wear and oxidation wear, accompanied by a small amount of spalling phenomenon.

Funds：

国家自然科学基金青年基金资助项目(51905126);国家重点研发计划项目(2019YFC1511400)

作者简介: 王建军(1980-), 男, 学士, 高级技师 E-mail: 475988826@ qq. com 通信作者: 张　新(1980-), 男, 博士, 研究员 E-mail: kmzx201@ 163. com

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