65Mn钢激光表面处理过程的组织分布及峰值温度模型  

Microstructure distribution and peak temperature model of 65Mn steel during laser surface treatment

作　　者：郭帅涵 李振兴 岑一鸣[2] 朱彦铭 陈冯琛 杨明涛 孔佳 Guo Shuaihan;Li Zhenxing;Cen Yiming;Zhu Yanming;Chen Fengchen;Yang Mingtao;Kong Jia(School of Materials Science and Engineering,Nanjing Institute of Technology,Nanjing Jiangsu 211167,China;Ningbo Branch of China Academy of Ordnance Science,Ningbo Zhejiang 315103,China)

机构地区：[1]南京工程学院材料科学与工程学院,江苏南京211167 [2]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《金属热处理》2024年第1期249-256,共8页Heat Treatment of Metals

基　　金：江苏省大学生创新创业训练计划(202211276052Y);南京工程学院人才引进基金(YKJ202105)。

摘　　要：采用高功率半导体激光器对农机用65Mn钢进行了激光表面处理,研究了激光功率(1.5~2.5 kW)和扫描速度(20~40 mm/s)对其显微组织和硬度分布的影响,利用ABAQUS软件对激光表面处理过程的温度分布进行了模拟,分析了温度场的变化规律,建立了关于峰值温度的数学模型。结果表明,激光表面处理后,65Mn钢硬化层组织为马氏体和残留奥氏体,且随距表面深度的增加,残留奥氏体含量减少。硬化层深度为80~680μm,硬度为800~970 HV0.5。此外,模拟结果表明,峰值温度随着扫描速度的减小和激光功率的升高而升高,随着距表面深度的增加而降低。所建立的峰值温度预测模型与模拟结果吻合较好,且对硬化层深度的预测结果与实测值较为吻合。Laser surface treatment of 65 Mn steel for agricultural machinery was carried out by using high power semiconductor laser.The effects of laser power(1.5⁃2.5 kW)and scanning speed(20⁃40 mm/s)on the microstructure and hardness distributions were studied.The temperature distribution during laser surface treatment was simulated by using ABAQUS software,the variation law of temperature field was analyzed,and the mathematical model of peak temperature was established.The results show that after laser surface treatment,the hardened layer of the 65Mn steel is composed of martensite and retained austenite,and the content of retained austenite decreases with the increase of depth from the surface.The depth of the hardened layer is 80⁃680μm,and the hardness is 800⁃970 HV0.5.In addition,the simulation results show that the peak temperature increases with the decrease of scanning speed and the increase of laser power,and decreases with the increase of depth from the surface.The established peak temperature model is in good agreement with the simulation results,and the culculation results of the hardened layer depth are in good agreement with the measured values.

关 键 词：65MN钢 激光表面处理 组织 硬度 峰值温度 

分 类 号：TG178[金属学及工艺—金属表面处理]