摘要
采用激光熔覆技术在45钢表面制备了Fe-Ni-Ti激光熔覆涂层,并研究了不同激光功率(1200、1400和1600 W)对Fe-Ni-Ti涂层成形质量和力学性能的影响。结果表明:不同激光功率下,熔池与热影响区之间均存在明显分界线,不同激光功率制备的熔覆涂层均能与基体形成良好的冶金结合;当激光功率为1200和1600 W时,熔覆层顶部表面出现较多的长裂纹;当激光功率为1400 W时,熔覆涂层的平均显微硬度最高,达到475.83 HV0.5,是基体硬度(187.7 HV0.5)的2.54倍,其摩擦磨损性能也较好,在稳定磨损阶段摩擦系数最低,磨损量仅有0.0051 g。Fe-Ni-Ti合金粉末在熔覆过程中会在熔池内部形成硬质相TiC颗粒,TiC不仅能细化涂层的晶粒大小,还能增加熔覆涂层中晶界的数量,有利于提升熔覆涂层的显微硬度和耐磨性。综合来看,当激光功率为1400 W时,熔覆涂层具有较好的成形质量和力学性能。
Fe-Ni-Ti laser cladding layers were prepared on the surface of 45 steel using laser cladding technology,and the effect of different laser powers(1200 W,1400 W,and 1600 W)on forming quality and mechanical properties of the Fe-Ni-Ti layers was studied.The results show that there is a clear boundary between the melt pool and the heat affected zone under different laser powers,and the laser cladding layers prepared by different laser powers can form good metallurgical bonding with the substrate.When the laser power is 1200 W and 1600 W,there are more long cracks on the top surface of the cladding layers.When the laser power is 1400 W,the average microhardness of the cladding layer is the highest,reaching 475.83 HV0.5,which is 2.54 times that of the hardness of the substrate(187.7 HV0.5),and its friction and wear performance is also good,with the lowest friction coefficient in the stable wear stage and a wear amount of only 0.0051 g.During the laser cladding,the Fe-Ni-Ti alloy powder can form hard phase TiC particles inside the melt pool,the TiC can not only refine the grain size of the cladding layer,but also increase the number of grain boundaries in the cladding layer,which is beneficial for improving the microhardness and wear resistance of the cladding layer.Overall,when the laser power is 1400 W,the cladding layer has good forming quality and mechanical properties.
作者
刘伟
柯大伟
闻凯
王纪龙
高婷
李翔
陈雪辉
LIU Wei;KE Da-wei;WEN Kai;WANG Ji-long;GAO Ting;LI Xiang;CHEN Xue-hui(College of Mechanical and Electrical Engineering,Anhui University of Architecture,Hefei 230601,China;Anhui Key Laboratory of Friction Vice for High-end Equipment,Hefei 231200,China;College of Intelligent Manufacturing,Anhui Institute of Vocational Technology,Hefei 230012,China)
出处
《材料热处理学报》
北大核心
2025年第5期157-165,共9页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51875152)
安徽省高校省级自然科学杰出青年研究项目(2022AH020025)
安徽省高校省级自然科学重点研究项目(2022AH050257)
高端装备关键摩擦副安徽省重点实验室开放基金项目(LCFP-2403,LCFP-2406)
安徽建筑大学自然科学项目(JZ202235,JZ202341)。
作者简介
刘伟(1982-),男,研究员,博士,主要从事摩擦学理论研究,发表论文30余篇,E-mail:weiliu8202@163.com。
