高速激光熔覆FeCoCrNiMn高熵合金熔覆层组织及耐磨性研究  

Microstructure and Wear Resistance of FeCoCrNiMn High-Entropy Alloy Coating by High-Speed Laser Cladding Technology

作　　者：王海威[1] 肖文波 WANG Haiwei;XIAO Wenbo(College of Science and Technology,Nanchang Aviation University,Gongqingcheng 332020,Jiangxi,China)

机构地区：[1]南昌航空大学科技学院,江西共青城332020

出　　处：《矿冶工程》2024年第5期148-152,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(12064027);江西省教育厅科技项目(GJJ2204302,GJJ2204305);江西省高层次高技能领军人才培养工程(2022-63)。

摘　　要：采用高速激光熔覆技术在201不锈钢表面制备了FeCoCrNiMn高熵合金熔覆层,研究了FeCoCrNiMn高熵合金熔覆层显微组织、相分布、显微硬度及干滑动磨损性能。结果表明,FeCoCrNiMn高熵合金熔覆层由单一的FCC固溶体组成,熔覆层未产生明显裂纹等缺陷,并与基体形成了良好的冶金结合。FeCoCrNiMn高熵合金熔覆层的显微硬度(439±2.1)HV,约为201不锈钢基体显微硬度的2倍。涂层的强化机制主要为细晶强化和固溶强化。高速激光熔覆技术制备的FeCoCrNiMn高熵合金熔覆层具有良好的耐磨性,平均摩擦因数为0.246,比磨损率2.59×10^(-6)mm^(3)/(N·m),磨损机理为黏着磨损和磨粒磨损,其耐磨性明显优于201不锈钢基体。采用高速激光熔覆技术制备的FeCoCrNiMn高熵合金熔覆层可显著提升机床部件的表面硬度、耐磨损性能和服役寿命。A FeCoCrNiMn high-entropy alloy(HEA)coating was prepared on the 201 stainless steel surface by adopting high-speed laser cladding technology,and then the microstructure,phase distribution,microhardness of FeCoCrNiMn coating,as well as its wear properties in dry sliding condition were all investigated.It is found that such laser cladded FeCoCrNiMn HEA coating consists of a single FCC structure,with no obvious cracks observed.It also forms a good metallurgical bond with the substrate.The microhardness of the coating is around(439±2.1)HV,nearly two times that of 201 stainless steel substrate,and the strengthening mechanisms mainly include strengthening by grain refinement and solid solution strengthening.Also,the FeCoCrNiMn coating presents an obviously better wear resistance than 201 stainless steel,with an average friction factor of 0.246 and a specific wear rate of about 2.59×10^(-6) mm^(3)/(N·m).The wear mechanisms for it include adhesive and abrasive wear.It is concluded that such FeCoCrNiMn HEA coating prepared by high-speed laser cladding technology can significantly improve the surface hardness,wear resistance and service life of machine components.

关 键 词：高速激光熔覆 熔覆层 相组成 耐磨性 高熵合金 FeCoCrNiMn 显微硬度 

分 类 号：TG174[金属学及工艺—金属表面处理]