激光熔覆WMoTaNb难熔高熵合金涂层工艺及摩擦磨损性能研究  

Study on Progress and Friction and Wear Properties of Laser Cladding WMoTaNb Refractory High-Entropy Alloy Coating

作　　者：王岩 李鹏江 马宁 刘世锋[1] 张帮彦 魏瑛康 王建勇 张亮亮 Wang Yan;Li Pengjiang;Ma Ning;Liu Shifeng;Zhang Bangyan;Wei Yingkang;Wang Jianyong;Zhang Liangliang(School of Metallurgical and Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,Shaanxi,China;School of Material Science and Engineering,Nanchang Hangkong University,Nanchang330063,Jiangxi,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]南昌航空大学材料科学与工程学院,江西南昌330063

出　　处：《应用激光》2024年第4期38-48,共11页Applied Laser

基　　金：国家自然科学基金资助项目(52104341,51901097);国家重点研发计划合作单位资助项目(2021YFB3701802,2021YFB3701902);陕西省工业重点攻关项目(2020ZDLGY13-10)。

摘　　要：通过激光熔覆工艺在GH4169合金表面制备WMoTaNb难熔高熵合金涂层。首先通过调控激光功率和扫描速度两个工艺参数,确定出最优工艺参数组合。再采用SEM、XRD、EDS、显微硬度计和摩擦磨损实验机等对涂层微观组织、相结构、元素分布、硬度和摩擦学性能进行表征分析。结果表明,涂层主要由柱状晶和杂乱的枝晶组成,主要相结构为BCC相和含Fe相。涂层与基体之间存在着元素的相互稀释扩散,形成较为良好的结合。激光熔覆制备的WMoTaNb涂层硬度能达到1 007.5 HV,室温下磨损率仅为5.49×10^(-5) mm^(3)/(N·m),远远优于GH4169合金基体。这些优异的表现为GH4169合金的性能提升和工程应用提供了更多的潜在可能性。WMoTaNb refractory high-entropy alloy coating was prepared on the surface of GH4169alloy by laser cladding in this paper.The optimal combination of process parameters was determined by regulating two process parameters,namely,laser power and scanning speed.Then SEM,XRD,EDS,microhardness tester and friction and wear tester were used to characterize the microstructure,phase structure,element distribution,hardness and tribological properties of the coating.The results show that the coating is mainly composed of columnar crystals and disordered dendrites,and the main phase structures are BCC phase and Fe-containing phase.There is a mutual dilution and diffusion of elements between the coating and the substrate,forming a relatively good bond.The microhardness of the WMoTaNb coating prepared by laser cladding can reach 1007.5HV,and the wear rate at room temperature is only 5.49×10^(-5) mm^(3)/(N·m),which is far better than the GH4169 alloy matrix.These excellent performances provide more potential possibilities for the performance enhancement and engineering applications of GH4169alloy.

关 键 词：激光熔覆 难熔高熵合金 微观组织 显微硬度 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]