45Mn钢发动机链板激光淬火表面的组织及力学性能

doi:10.13251/j.issn.0254-6051.2023.04.040

金属热处理 ›› 2023, Vol. 48 ›› Issue (4): 257-263.DOI: 10.13251/j.issn.0254-6051.2023.04.040

45Mn钢发动机链板激光淬火表面的组织及力学性能

李枭¹, 杨勇¹, 巩春红²

1.青岛理工大学机械与汽车工程学院, 山东青岛 266520;
2.夏津县产业融合发展中心, 山东德州 253200

收稿日期:2022-09-29 修回日期:2022-12-27 发布日期:2023-05-27
通讯作者: 杨勇,教授,E-mail:yyong901@163.com
作者简介:李枭(1995—),男,硕士研究生,主要研究方向为金属材料表面改性,E-mail:516891266@qq.com。
基金资助:
山东省自然科学基金(ZR2022ME058);青岛西海岸新区科技计划自主创新重大专项(2021-54)

Microstructure and mechanical properties of laser hardened surface of 45Mn steel engine chain plate

Li Xiao¹, Yang Yong¹, Gong Chunhong²

1. School of Mechanical and Automative Engineering, Qingdao University of Technology, Qingdao Shandong 265200,China;
2. Xiajin County Industrial Integration Development Center, Dezhou Shandong 253200, China

Received:2022-09-29 Revised:2022-12-27 Published:2023-05-27

摘要/Abstract

摘要： 针对大型船舶发动机链条内外链板之间磨损严重的问题,提出采用激光淬火表面改性技术来提高链板表面力学性能的方法,并对45Mn钢表面进行单道和多道激光淬火试验,分析了其激光淬火后的显微组织和硬度变化规律。结果表明,单道激光淬火后形成了以板条马氏体与细小马氏体为主的相变硬化区。当激光功率为300~900 W、扫描速度为5~20 mm/s时,45Mn钢单道激光淬火后的表面硬度为850~950 HV,有效硬化深度约为0.63 mm,在基本没有改变表面粗糙度的前提下降低磨损体积,为未激光淬火时的45.1%~53.0%。多道搭接激光淬火形成以回火马氏体为主的软化区。经搭接率为30%的多道激光淬火后45Mn钢表面硬度较为平均,回火软化区的宽度为0.68 mm。

关键词: 45Mn钢, 激光淬火, 力学性能, 搭接率, 回火软化

Abstract: In order to solve the problem of severe wear between inner and outer chain plates of large marine engine chain, the surface modification technology of laser quenching was proposed to improve the mechanical properties of chain plate surface. The single-channel and multi-channel laser quenching tests were carried out on the surface of the 45Mn steel, and the microstructure and hardness changes after laser quenching were analyzed.The results show that the phase transformation hardening zone dominated by slatted martensite and fine martensite was formed after single-pass laserquenching. When the laser power is 300-900 W and the scanning speed is 5-20 mm/s, the surface hardness of the 45Mn steel after single laser quenching is 850-950 HV, the effective hardening depth is about 0.63 mm, and the wear volume decreases to 45.1%-53.0% of that without laser quenching and without changing the surface roughness. Multi-pass lap laser quenching forms a softened zone dominated by tempered martensite. After multi-channel laser quenching with overlap rate of 30%, the surface hardness of the 45Mn steel is relatively average, and the width of temper softening zone is 0.68 mm.

Key words: 45Mn steel, laser quenching, mechanical properties, overlapping rate, temper softening

中图分类号:

TG162.79

李枭, 杨勇, 巩春红. 45Mn钢发动机链板激光淬火表面的组织及力学性能[J]. 金属热处理, 2023, 48(4): 257-263.

Li Xiao, Yang Yong, Gong Chunhong. Microstructure and mechanical properties of laser hardened surface of 45Mn steel engine chain plate[J]. Heat Treatment of Metals, 2023, 48(4): 257-263.

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45Mn钢发动机链板激光淬火表面的组织及力学性能

Microstructure and mechanical properties of laser hardened surface of 45Mn steel engine chain plate

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