Microstructure and properties of Al-70Si prepared by laser cladding

激光熔覆制备Al-70Si组织及性能研究 Microstructure and properties of Al-70Si prepared by laser cladding 王云龙 WANG Yunlong 1 first-author 华鹏 HUA Peng 1 李枘 LI Rui 1 王国平 WANG Guoping 1 李先芬 LI Xianfen 1 周伟 ZHOU Wei 1 2 合肥工业大学材料科学与工程学院 合肥工业大学材料科学与工程学院 School of Materials Science and Engineering,Hefei University of Technology School of Materials Science and Engineering,Hefei University of Technology 南洋理工大学机械与航空学院 南洋理工大学机械与航空学院 School of Mechanics and Aeronautics,Nanyang Technological University School of Mechanics and Aeronautics,Nanyang Technological University 采用LWS-1000型Nd:YAG激光器在1050铝合金表面多层激光熔覆制备Al-70Si,观察和测试分析了Al-70Si的宏微观组织和相关力学性能,并探究了热处理对熔覆层的影响。结果表明:脉冲激光加工技术可以成功制备Al-70Si材料,熔覆层中硅颗粒自基体侧起分别呈现圆润球状、长条状、五星瓣状,熔覆层平均硬度值达到250 HV,抗拉强度为85 MPa,基体耐磨性能明显提高。进行500℃保温4 h热处理后,硅颗粒尺寸降低且尖角钝化,更为圆润,硬度值上升50 HV,热导率也相应提高。 Al-70 Si alloy was prepared by multi-laser cladding on 1050 aluminium alloy with LWS-1000-Nd:YAG laser. The microstructure and mechanical properties of Al-70 Si cladding layer were investigated. The effect of heat treatment on microstructure and properties of cladding layer were explored. The results show that Al-70 Si alloy is successfully fabricated by laser processing technology. In the cladding layer,the morphology of silicon particles are cha-racterized by round spherical shape,long strip shape and five-star petal shape respectively. The average hardness of the cladding layer is 250 HV,the tensile strength is 85 MPa,and the wear resistance of the substrate is obviously imp-roved. After heat treatment at 500 ℃ for up to 4 h,because of the reduction of silicon particle size and more rounded silicon particles,the maximum value of cross-section har-dness is improved by 50 HV and the thermal conductivity also increases accordingly. 激光熔覆 Al-70Si 微观组织 力学性能 热处理 TG665;TG146.21 安徽省自然科学基金(1808085ME150) 2022-03-08 11 50