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作 者:韩晨阳 孙耀宁[1] 徐一飞 张瑞华 赵芳 陈玲娜 Han Chenyang;Sun Yaoning;Xu Yifei;Zhang Ruihua;Zhao Fang;Chen Lingna(School of Mechanical Engineering,Xinjiang University,Urumqi 830047,China;Yangjiang Hardware Knife and Scissors Industrial Technology Research Institute,Yangjiang 529533,China;Yangjiang High Power Laser Application Laboratory Co.,Ltd,Yangjiang 529533,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
机构地区:[1]新疆大学机械工程学院,新疆乌鲁木齐830047 [2]阳江市五金刀剪产业技术研究院,广东阳江529533 [3]阳江市高功率激光应用实验室有限公司,广东阳江529533 [4]兰州理工大学材料科学与工程学院,甘肃兰州730050
出 处:《稀有金属材料与工程》2022年第2期607-614,共8页Rare Metal Materials and Engineering
基 金:自治区科技支疆项目计划(2020E0264);阳江市科技计划项目(SDZX2020009,SDZX2019005,SDZX2019038)。
摘 要:采用激光熔覆技术在304不锈钢表层制备了纳米TiC增强AlCoCrFeNi高熵合金涂层,利用扫描电镜、能谱仪、X射线衍射仪等设备系统研究了涂层的组织形貌、相结构及元素分布;采用显微硬度计、摩擦磨损仪、超景深显微镜和电化学工作站等设备表征了涂层的硬度分布、磨损特性及耐腐蚀性能。结果表明,类球形纳米级TiC与棒状微米级TiC沉淀相均匀分布在涂层bcc(B2)相基体中。添加TiC增强相后,AlCoCrFeNi高熵合金涂层的硬度比未添加TiC涂层的硬度提升了15%;表层磨损率及磨损后表面单位面积粗糙度(Ra)分别较AlCoCrFeNi高熵合金涂层降低了42%和18%,涂层中TiC增强相的弥散强化作用是涂层硬度、耐磨性提升的主要原因。添加TiC的AlCoCrFeNi高熵合金涂层较未添加TiC涂层的自腐蚀电流降低了约1个数量级,TiC增强相使涂层表面形成致密的钝化膜是其耐蚀性能好的主要原因。Nano-TiC reinforced AlCoCrFeNi high entropy alloy coating was prepared on 304 stainless steel surface by laser cladding technique. The microstructure, phase structure and element distribution of the coating were studied by scanning electron micr oscopy,energy dispersive spectroscopy and X-ray diffraction. The hardness distribution, wear characteristics and corrosion resistance of the coatings were characterized by microhardness tester, friction and wear tester, ultra-depth of field microscope and electrochemical workstation. The results show that the quasi-spherical nano-TiC and rod-like micron TiC precipitates are uniformly distributed in the coated bcc(B2) matrix. The hardness of AlCoCrFeNi high entropy alloy coating increases by 15% after the addition of TiC phase compared with that without the addition of TiC. The surface wear rate and surface roughness per unit area( Ra) decrease by 42% and 18%,respectively, compared with those of AlCoCrFeNi high entropy alloy coating. The dispersion strengthening effect of TiC reinforcin g phase in the coating is the main reason for the improvement of coating hardness and wear resistance. The self-corrosion current of AlCoCrFeNi high entropy alloy coating with TiC is about one order of magnitude lower than that coating of without TiC. The dense passivation film formed on the surface of the coating by TiC reinforcing phase is the main reason for its good corrosion resistance.
关 键 词:AlCoCrFeNi高熵合金 微观组织 耐磨性 耐蚀性
分 类 号:TG174.44[金属学及工艺—金属表面处理]
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