引用本文:聂翔宇,汤海波,刘澜涛,何蓓,刘栋.激光相变强化工艺参数对40CrNiMo钢组织与耐磨性的影响∗[J].中国表面工程,2022,35(1):237~246
NIE Xiangyu,TANG Haibo,LIU Lantao,HE Bei,LIU Dong.Effects of Process Parameters on Microstructure and Wear Properties of 40CrNiMo Steel by Laser Transformation Hardening[J].China Surface Engineering,2022,35(1):237~246
【打印本页】   【HTML】   【下载PDF全文】   【查看/发表评论】  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被：浏览 1124次   下载 773次 本文二维码信息
码上扫一扫！
分享到： 微信 更多
字体:加大+|默认|缩小-
激光相变强化工艺参数对40CrNiMo钢组织与耐磨性的影响∗
聂翔宇1,2, 汤海波1,3, 刘澜涛1,2, 何蓓1,3, 刘栋1,3
1.北京航空航天大学大型金属构件增材制造国家工程实验室 北京 100191;2.北京航空航天大学材料科学与工程学院 北京 100191;3.北京航空航天大学前沿科学技术创新研究院 北京 100191
摘要:
航空发动机传动部件服役过程易磨损失效，为提高其寿命和可靠性需进行表面强化。在 40CrNiMo 合金钢表面进行激光相变强化处理，通过调控扫描速度获得不同激光相变强化区组织，对其显微硬度和摩擦磨损性能进行表征。结果表明，随扫描速度降低，硬化层宽度和深度增大，显微组织变粗，马氏体含量增加。不同扫描速度下，硬化层表面显微硬差异小，为 77~789 HV，相比基材(330 HV)提升 135%以上。激光相变强化处理后，试样耐磨性大幅提升，硬化区组织为孪晶马氏体+回火索氏体的试样耐磨性最优，摩擦因数相比基材降低 24.9%，磨损体积减少 94.3%。研究表明，由高强的细小孪晶马氏体和韧性较好的细小回火索氏体组成的复相组织，能有效阻碍裂纹形成和扩展，显著提升耐磨性能。调控激光相变强化工艺参数， 获得高强马氏体+韧性相的复相组织，能获得优异的耐磨性能。
关键词:  激光相变强化  扫描速度  显微组织  显微硬度  耐磨性能
DOI：10.11933/j.issn.1007-9289.20210420002
分类号:TG111
基金项目:国家重点研发计划(2018YFB2002000)；国家科技重大专项(2017-Ⅶ-0003-0096)资助项目
Effects of Process Parameters on Microstructure and Wear Properties of 40CrNiMo Steel by Laser Transformation Hardening
NIE Xiangyu1,2, TANG Haibo1,3, LIU Lantao1,2, HE Bei1,3, LIU Dong1,3
1.National Engineering Laboratory of Additive Manufacturing for Large Metallic Components,Beihang University, Beijing 100191 , China;2.School of Materials Science and Engineering, Beihang University, Beijing 100191 , China;3.Research Institute for Frontier Science, Beihang University, Beijing 100191 , China
Abstract:
Aero-engine transmission components are easy to wear and fail in service. In order to improve their service life and reliability, surface strengthening is needed. Laser transformation hardening treatment is carried out on the surface of 40CrNiMo alloy steel. The microstructure of different laser transformation hardening areas is obtained by adjusting the scanning speed, and its microhardness and friction and wear properties are characterized. Results show that with the decrease of scanning speed, the width and depth of hardened layer increase, the microstructure coarsens and the content of martensite increases. Under different scanning speeds, there is little difference in the surface microhardness of the hardened layer, which is 776-789 HV, which is more than 135% higher than that of the substrate (330 HV). After laser transformation hardening treatment, the wear resistance of the sample is greatly improved. The wear resistance of the sample with twin martensite + tempered sorbite in the hardened zone is the best, the friction factor is reduced by 24.9%, and the wear volume is reduced by 94.3%. Results show that the multiphase structure composed of fine twin martensite with high strength and fine tempered sorbite with good toughness can effectively hinder the formation and propagation of cracks and significantly improve the wear resistance. By adjusting the process parameters of laser transformation hardening, the multiphase structure of high-strength martensite + ductile phase can be obtained, and excellent wear resistance can be obtained.
Key words:  laser transformation hardening  scanning speed  microstructure  microhardness  wear properties
手机扫一扫看