激光熔覆高硬度M2钢的修复工艺及性能研究  

Study on the Remanufacturing Processing and Properties of High-Hard M2 Steel by Laser Cladding

作　　者：阙云婕 覃恩伟 陈雲 陆海峰 梁志涛 石皋莲[2] 吴树辉[3] 陈宝玮 QUE Yunjie;QIN Enwei;CHEN Yun;LU Haifeng;LIANG Zhitao;SHI Gaolian;WU Shuhui;CHEN Baowei(School of Intlligent Manufacturing and Smart Transportation,Suzhou City University,Suzhou 215104,China;School of Intelligent Equipment,Suzhou Vocational Institute of Industrial Technology,Suzhou 215104,China;Suzhou Nuclear Power Research Institute,Co.,Ltd.,Suzhou 215004,China)

机构地区：[1]苏州城市学院智能制造与智慧交通学院,江苏苏州215104 [2]苏州工业职业技术学院智能装备学院,江苏苏州215104 [3]苏州热工研究院有限公司,江苏苏州215004

出　　处：《表面工程与再制造》2025年第1期17-24,共8页Surface Engineering & Remanufacturing

基　　金：江苏省2024年大学生创新训练计划(202413983117Y);苏州工业职业技术学院科研启动经费(2023KYQD002)项目资助。

摘　　要：针对碳钢机械构件的尺寸修复和延寿的再制造工程应用需求,开展了激光熔覆高硬度M2高速钢的工艺及性能研究。以稀释率为指标,优化了激光功率和扫描速度的关键工艺参数匹配,分析了熔覆层横截面成分和微观组织结构,并检测了熔覆层显微硬度和冲击韧性。结果显示,通过激光熔覆制备出了无裂纹孔洞缺陷的高硬度熔覆层,受冷却速度影响,其横截面呈梯度结构,表层和内层分别为马氏体和贝氏体为主的微观组织。表层硬度提升至碳钢基体的3.4倍。在获得高硬度的同时,其冲击韧性也随着熔覆层厚度的增加而增加。高强度和高韧性匹配的结果显示,激光熔覆M2覆层可应用于碳钢构件尺寸修复和性能提升的再制造工程应用。To fulfll the engineering requirements of size restoration and life extension of carbon steel mechanical components,the processing and properties of high-hardness M2 high-speed steel by laser cladding were studied.The matching of laser power and scanning velocity were optimized based on dilution ratio.The cross-sectional composition and microstructure of the cladding were characterized,and the microhardness and impact toughness of the cladding layer were also tested.The results showed that a highly hard overlay without cracking and porosity was successfully obtained.The transverse microstructure exhibited a gradient structure due to the varying cooling rates,with surface and inner part being martensite and bainite,respective.The hardness of the surface was 3.4 times that of the substrate carbon steel.The impact toughness increased with increasing overlayer thickness.The combination of high hardness and toughness revealed that laser cladding M2 overlay can be applied to the engineering application of carbon steel components to restore the dimensional size and enhance service performance.

关 键 词：熔覆层 微观组织 硬度 冲击韧性 修复 

分 类 号：TH17[机械工程—机械制造及自动化] TG665[金属学及工艺—金属切削加工及机床]