Microstructure and Properties of AlCoCrFeNiTi High-Entropy Alloy Coatings Prepared by Laser Cladding  

作　　者：Mengxian Li Zhiping Sun Zhaomin Xu Zhiming Wang 

机构地区：[1]Qingdao ADR Axles Manufacturing Co.,Ltd,Shandong Qingdao 266400,China [2]School of Mechanical&Automotive Engineering,Qilu University of Technology(Shandong Academy of Sciences),Ji'nan 250300,China

出　　处：《Journal of Harbin Institute of Technology(New Series)》2024年第2期50-61,共12页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the Project to Enhance the Innovative Capabilities of Science and Technology SMEs of Shandong Province(Grant No.2023TSGC0531).

摘　　要：21-4N(5Cr21Mn9Ni4N)is extensively employed in the production of engine valves,operating under severe conditions.Apart from withstanding high-temperature gas corrosion,it must also endure the impact of cylinder explosion pressure.The predominant failure mode of 21-4N valves is abrasive wear.Surface coatings serve as an effective approach to prevent such failures.In this investigation,Laser cladding technology was utilized to fabricate AlCoCrFeNiTi high entropy alloy coatings onto the surfaces of 21-4N valves.According to the findings,the cladding zone has a normal dendritic microstructure,a good substrate-to-cladding layer interaction,and no obvious flaws.In terms of hardness,the cladding demonstrates an average hardness of 620 HV.The hardness has increased by 140%compared to the substrate.The average hardness of the cladding remains at approximately 520 HV even at elevated temperatures.Regarding frictional wear performance,between 400℃and 800℃,the cladding layer exhibits an average friction coefficient of 0.4,with the primary wear mechanisms being abrasive wear,adhesive wear,and a minor degree of plastic deformation.

关 键 词：high entropy alloy laser cladding MICROSTRUCTURE microstructure and properties 

分 类 号：TB31[一般工业技术—材料科学与工程]