庞铭,郎甜甜

• 1:中国民航大学机场学院

摘要(Abstract)：

采用光学显微镜、扫描电镜、能谱仪、硬度仪、电化学工作站和摩擦磨损试验等研究了激光增材镍基高温合金层的宏观形貌、显微组织、元素、硬度分布、电化学腐蚀性能和磨损性能。结果表明:由于基体中的石墨可以降低其附近熔点等综合因素,增材层与基体交界区域为锯齿状;在增材层出现贯穿增材层多层区域的柱状晶组织;由于激光的快速加热和冷却、基体中不同区域石墨溶解量不同等综合影响,基体靠近热影响区域可以观察到马氏体、莱氏体和残留奥氏体组织;由于基体中熔化的石墨进入增材层等综合影响,从增材层表层到增材层与基体交界区域的硬度逐渐增加;基体和激光增材区域的自腐蚀电位分别是-640 mV和-534 mV,腐蚀电流密度15.92μA·cm~(-2)和15.03μA·cm~(-2),说明增材区域的抗腐蚀性能提高;由于激光增材层硬度提高等综合因素,基体的磨损率约是增材层的4.7倍。

关键词(KeyWords)： 激光增材;球墨铸铁;镍基高温合金层;热影响区

Abstract:

Keywords:

基金项目(Foundation): 中央高校基本科研业务费项目中国民航大学专项资助(3122018D020);; 中国民航大学蓝天青年科研资金资助项目(2018.3-2022.3)

作者(Author): 庞铭,郎甜甜

DOI: 10.13289/j.issn.1009-6264.2020-0160

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