激光功率对FeCoNiCrMo高熵合金熔覆层组织与性能的影响  

Effect of laser power on microstructure and properties of FeCoNiCrMo high entropy alloy cladding layer

作　　者：杨行 王华[1,2] 徐峰[1,2] 李江华[1,2] 张雷 YANG Hang;WANG Hua;XU Feng;LI Jiang-hua;ZHANG Lei(School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723000,China;National and Local Joint Engineering Laboratory of Slag Comprehensive Utilization,Shaanxi University of Technology,Hanzhong 723000,China)

机构地区：[1]陕西理工大学材料科学与工程学院,陕西汉中723000 [2]陕西理工大学矿渣综合利用环保技术国家与地方联合工程实验室,陕西汉中723000

出　　处：《材料热处理学报》2023年第4期157-168,共12页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51901120)。

摘　　要：为了探究激光功率对熔覆层组织与性能的影响,采用6种激光功率在42CrMo钢表面制备了FeCoNiCrMo高熵合金熔覆层。通过X射线衍射仪(XRD)、扫描电镜(SEM)、能谱仪(EDS)、维氏显微硬度计、应力分析仪、摩擦磨损试验机和电化学工作站对熔覆层的显微组织、物相、力学性能及耐蚀性能进行了研究。结果表明:激光熔覆制备的FeCoNiCrMo涂层的组织主要为FCC固溶体相,当激光功率大于1.6 kW时,涂层出现BCC相(α-Fe)结构,组织为树枝晶,枝晶内为马氏体,枝晶间为含Cr、Mo元素的铁素体;随着激光功率增大,涂层硬度先增大后减小,1.6 kW时达最大值522 HV0.3;激光功率1.8 kW时涂层的耐磨性与耐腐蚀性最好,磨损率与自腐蚀电流密度分别为0.71×10^(-5) g·N^(-1)·m^(-1)和1.69×10^(-9) A·cm^(-2)。激光功率是影响FeCoNiCrMo高熵合金涂层组织与性能的重要因素,提高激光功率有利于促进BCC相的生成,显著提高涂层力学性能及腐蚀性能。In order to investigate the influence of laser power on microstructure and properties of cladding layer,FeCoNiCrMo high entropy alloy cladding layer was prepared on the surface of 42CrMo steel by using six kinds of laser power.Microstructure,phase,mechanical properties and corrosion resistance of the cladding layer were studied by means of X-ray diffractometer(XRD),scanning electron microscopy(SEM),energy dispersive spectrometer(EDS)analysis,Vickers microhardness tester,stress analyzer,friction and wear tester and electrochemical workstation.The results show that the microstructure of the FeCoNiCrMo layer prepared by laser cladding is mainly FCC solid solution phase.When the laser power is greater than 1.6 kW,BCC phase(α-Fe)structure appears in the cladding layer,showing dendrite microstructure with martensite in the dendrite and Cr-and Mo-containing ferrite located between dendrites.With the increase of laser power,the hardness of the cladding layer first increases and then decreases,reaching a maximum of 522 HV0.3 at 1.6 kW.When the laser power is 1.8 kW,the wear resistance and corrosion resistance of the cladding layer are the best,and the wear rate and self corrosion current density are 0.71×10^(-5) g·N^(-1)·m^(-1) and 1.69×10^(-9) A·cm^(-2),respectively.Laser power is an important factor that affects the microstructure and properties of the FeCoNiCrMo high entropy alloy layer.Increasing laser power is conducive to promoting the formation of BCC phase,significantly improving the mechanical properties and anti-corrosion properties of the cladding layer.

关 键 词：激光熔覆 FeCoNiCrMo高熵合金涂层 摩擦性能 电化学性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]