华石伟,庞铭

• 1:中国民航大学交通科学与工程学院

摘要(Abstract)：

采用激光熔覆技术在Q235钢表面制备了Ti_3SiC_2增强镍基熔覆层,通过光学显微镜、扫描电镜、显微硬度仪和摩擦磨损试验等研究了熔覆层的宏观形貌、组织、硬度分布、物相和耐磨性能。结果表明:由于Ti_3SiC_2的加入降低了熔池的流动性,导致加入Ti_3SiC_2的熔覆层与基体交界处形貌为波浪状,熔覆层组织有向枝晶转化趋势;加入Ti_3SiC_2的熔覆层的物相主要为γ-Ni基体、金属间化合物Ni_3Fe、Cr_(1.22)Ni_(2.88)和硬质相TiC、SiC;由于表层晶粒细化等综合因素影响,未加入Ti_3SiC_2的熔覆层最高硬度在表层;由于Ti_3SiC_2在高温下分解后凝固形成的高硬度的SiC和TiC,导致加入Ti_3SiC_2的熔覆层的最高硬度出现在熔覆层的次表层;未加入Ti_3SiC_2的熔覆层磨损量是加入的4倍,且磨损机理由粘着磨损、氧化磨损转化为磨粒磨损、氧化磨损。

关键词(KeyWords)： 镍基合金;激光熔覆;耐磨性能;Ti_3SiC_2

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52075559)

作者(Author): 华石伟,庞铭

DOI: 10.13289/j.issn.1009-6264.2021-0202

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