张东宇,唐景黎,舒致航,张顺顺,黄本生

• 1:西南石油大学新能源与材料学院

摘要(Abstract)：

为了探索制备工艺对高熵合金涂层组织与性能的影响,利用氩弧熔覆方法在Q235钢表面制备了等摩尔比CoCrFeNiMo高熵合金涂层。采用光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)等研究了涂层的组织形貌及物相,采用显微硬度计和摩擦磨损试验机分析了涂层的硬度和耐磨性。结果表明:采用氩弧熔覆方法能成功在Q235钢表面制备出厚度在2 mm以上的CoCrFeNiMo高熵合金涂层;靠近涂层顶部,熔覆电流对涂层的组织影响明显;随着熔覆电流的增加,涂层中上部过渡区组织由胞状晶向枝状晶和等轴晶转变,同时出现晶粒细化现象,BCC、FCC两相固溶体逐渐转变到BCC单相固溶体。随熔覆电流的增加,涂层的硬度和耐磨性均先升高后降低,涂层表层硬度最大,向基体方向呈下降趋势。当熔覆电流为200 A时,涂层的表层硬度最高,达626.7 HV0.2,约为Q235基体的4倍,其耐磨性也最好。涂层的磨损机制主要为粘着磨损,熔覆电流为200 A制备的涂层伴随有磨粒磨损。

关键词(KeyWords)： 氩弧熔覆;高熵合金涂层;显微组织;显微硬度;耐磨性

Abstract:

Keywords:

基金项目(Foundation): 国家级大学生创新创业训练计划(S202010615030);; 西南石油大学大学生课外开放试验项目(KSZ19501)

作者(Author): 张东宇,唐景黎,舒致航,张顺顺,黄本生

DOI: 10.13289/j.issn.1009-6264.2021-0099

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