锻压技术

P20 汽车模具钢表面激光淬火对其组织与性能的影响

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

单位：1. 忻州职业技术学院 2. 中山大学 3. 中国消防救援学院 4. 忻州涌盈环境建设有限公司 5. 国家电投集团中央研究院

关键词：TG156. 34

分类号：TG156. 34

出版年,卷(期):页码：2023,48(1):222-228

摘要：

采用激光淬火技术对P20 模具钢进行表面热处理, 对淬火层的微观组织和摩擦磨损性能进行了研究, 并就激光淬火技术对模具钢的强化机理做出阐释。结果表明: 基体为已经分解的珠光体组织, P20 模具钢淬火区域的组织为针状马氏体和板条状马氏体, 并且随着激光功率的增大, 马氏体组织出现粗化现象; 淬火后主要形成了(Cr, Fe)、(Mn, Fe) 固溶体, 产生了固溶强化; 经过激光淬火后的P20 模具钢的硬度得到很大提升, 最大硬度值为520 HV, 测得淬硬层的深度约为0. 93 mm; 激光功率为1800 W 时, 淬火层的磨损率仅为0. 36%, 摩擦因数为0. 2013。P20 模具钢激光淬火的摩擦磨损机理为磨粒磨损+氧化磨损, 同时伴随少量的剥落现象。

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.

基金项目：

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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