超高速激光熔覆制备M2涂层的组织结构与性能研究
Cailiao Baohu（2024）
Abstract
超高速激光熔覆技术作为一种新型的表面工程技术，具有快速加工、精密控制、热影响小等优点，适用于多种材料表面的涂层制备。为了研究熔覆速度对M2涂层组织结构和性能的影响，利用超高速激光熔覆技术在Q235钢表面制备了M2涂层。利用扫描电子显微镜、X射线衍射仪、硬度计、摩擦磨损仪、电化学工作站分别测试了涂层的微观组织、物相组成、硬度、耐磨性和耐腐蚀性。结果表明：熔覆速度为1.2 m/min时，涂层与基体结合无缝隙，显微硬度为757.1 HV,摩擦系数为0.448,腐蚀电流密度J corr 为1.98×10 -6 A/cm 2 ;随着熔覆速度的提高，涂层与基体结合处出现缝隙，晶粒减小，稀释率减小，硬度增大，摩擦系数减小；当熔覆速度为40.0 m/min时，涂层与基体结合处出现较大裂纹，此时晶粒等效平均直径为1.76μm,稀释率为6.8%,平均显微硬度828.1 HV,平均摩擦系数为0.345,腐蚀电流密度J corr 为1.26×10 -7 A/cm 2 。熔覆速度对超高速激光熔覆涂层的宏观形貌和性能的影响较大。随着熔覆速度的增大，涂层区域出现裂纹。随着熔覆速度的提高，涂层的晶粒等效直径减小，硬度、耐磨性、耐腐蚀性均提高。各涂层的物相组成均为马氏体、残余奥氏体和碳化物。本工作为M2高速钢涂层的制备和参数优化提供了理论依据。
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Key words
laser cladding,M2 high-speed steel,microstructure,mechanical properties,interfacial bonding
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