超高速激光熔覆TiC/Inconel 625复合涂层的组织和性能提升研究  

Microstructure and Properties Improvement of TiC/Inconel 625 Composite Coatings Using Extreme High-Speed Laser Cladding

作　　者：葛通 陈兰[1] 谷朋飞 任旭东[1] Ge Tong;Chen Lan;Gu Pengfei;Ren Xundong(School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《激光与光电子学进展》2023年第5期139-146,共8页Laser & Optoelectronics Progress

基　　金：国家重点研发计划(2016YFB1102602);国家自然科学基金(51975261);江苏省青年科学基金(BK20210754)。

摘　　要：超高速激光熔覆技术(EHLA)可以突破涂层生产的效率瓶颈,为制备高质量涂层提供有效途径。采用EHLA和常规激光熔覆(CLA)技术在45钢基体上制备TiC/Inconel 625复合涂层,并对涂层的微观组织、物相组成、耐腐蚀性能以及摩擦磨损性能进行了表征。结果表明,两种涂层的显微组织均表现出相同的生长模式,由胞状或柱状枝晶向等轴枝晶转变。对于EHLA涂层,98.2 m/min的熔覆速度加快了凝固组织的冷却速率,从而细化了枝晶,平均枝晶间距不超过1μm,并且所形成的细化组织有助于涂层耐蚀性的提升。TiC的加入促进了枝晶间碳化物的形成,并起到了沉淀强化的作用,同时在涂层表面形成了致密的钝化膜。并且EHLA涂层的摩擦系数低于CLA涂层,展现出良好的摩擦磨损性能。Extreme highspeed laser cladding(EHLA)technology can break through the efficiency bottleneck of coating production and provide an effective way to prepare highquality coatings.TiC/Inconel 625 composite coatings were prepared on 45 steel substrates using EHLA and conventional laser cladding(CLA)technologies,and the microstructure,phase composition,corrosion resistance,and friction and wear properties of the coatings were characterized.Results show that the microstructure of the two coatings exhibits the same growth pattern,from cellular or primary columnar crystal to equiaxed crystal.For the EHLA coating technology,a cladding speed of 98.2 m/min accelerates the cooling rate of the solidified microstructure,thereby refining the dendrite.The average particle size is less than 1μm,contributing to the improvement of the corrosion resistance of the coating.The addition of TiC promotes the formation of interdendritic carbide,thereby playing the role of precipitation strengthening,and forming dense passivation on the coating surface.The friction coefficient of the EHLA coating technology is lower than that of the CLA coating technology,showing good friction and wear performance.

关 键 词：激光技术 超高速激光熔覆 TiC/Inconel 625复合涂层 微观结构 耐腐蚀性能 摩擦磨损性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]