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首页> 外文期刊>Materials Science and Engineering >Influence of MCrAlY coating on low-cycle fatigue behavior of a directionally solidified nickel-based superalloy in hot corrosive environment
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Influence of MCrAlY coating on low-cycle fatigue behavior of a directionally solidified nickel-based superalloy in hot corrosive environment

机译：MCrAlY涂层对热腐蚀环境下定向凝固镍基高温合金低周疲劳行为的影响

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摘要

The turbine blade in marine environments usually suffers from combined hot corrosive and cycle loading effects. MCrAlY coating was used as a protective coating to prevent corrosive degradation for practical applications. However, the coating can sometimes alter fatigue behavior, which is not reported for nickel-based superalloy. In the present study, MCrAlY coating influence on low-cycle fatigue behavior (e.g., lifetime and fatigue cracks initiation mechanism) was experimentally investigated in a hot corrosive environment for an uncoated and coated directionally solidified nickel-based superalloy. The lifetime of uncoated samples was drastically reduced due to corrosive attacks. However, the presence of the MCrAlY coating was beneficial for the lifetime of samples under low stresses. But the coating effect was nearly negligible under high stresses because of the early cracking. Moreover, the crack in coating facilitated corrosive elements to reach substrate materials and then local corrosion zone took place in substrate. The fatigue crack in the substrate nucleated from the local corrosion zone. Our results show that MCrAlY coating can be successfully used in machine parts in an aggressive environment only under relative lower fatigue loading condition.
机译：海洋环境中的涡轮叶片通常遭受热腐蚀和循环载荷的综合影响。 MCrAlY涂层用作防护涂层，以防止在实际应用中腐蚀降解。但是，该涂层有时会改变疲劳行为，这对于镍基高温合金没有报道。在本研究中，MCrAlY涂层在热腐蚀环境中对未涂层和涂层定向凝固的镍基高温合金进行了实验研究，研究了MCrAlY涂层对低周疲劳行为（例如寿命和疲劳裂纹萌生机理）的影响。由于腐蚀侵蚀，未涂层样品的寿命大大缩短。但是，MCrAlY涂层的存在对于低应力下的样品寿命是有益的。但由于开裂较早，因此在高应力下的涂层效果几乎可以忽略不计。而且，涂层中的裂纹促进了腐蚀性元素到达基底材料，然后在基底中发生了局部腐蚀区。基材中的疲劳裂纹从局部腐蚀区成核。我们的结果表明，只有在相对较低的疲劳载荷条件下，MCrAlY涂层才能在侵蚀性环境中成功地用于机械零件。

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  • 来源
    《Materials Science and Engineering》 |2016年第10期|57-64|共8页
  • 作者

    Shaolin Li; Xiaoguang Yang; Hongyu Qi; Guoqiang Xu; Duoqi Shi;

  • 作者单位

    School of Energy and Power Engineering, Beihang University, Beijing 100191, China;

    School of Energy and Power Engineering, Beihang University, Beijing 100191, China,Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China;

    School of Energy and Power Engineering, Beihang University, Beijing 100191, China,Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China;

    School of Energy and Power Engineering, Beihang University, Beijing 100191, China,Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China;

    School of Energy and Power Engineering, Beihang University, Beijing 100191, China,Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Coating; Hot corrosion; Low-cycle fatigue; Cracks;

    机译：涂层;热腐蚀;低周疲劳;裂缝;

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