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首页> 外文期刊>Journal of Materials Engineering and Performance >Hot Corrosion Behavior of Superalloy IN718 at 550 and 650℃
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Hot Corrosion Behavior of Superalloy IN718 at 550 and 650℃

机译：高温合金IN718在550和650℃下的热腐蚀行为

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摘要

This investigation was undertaken to evaluate oxidation and hot corrosion behavior of the Fe-Ni-based superalloy IN718, at 550 and 650℃, to explore its performance as turbine engine components under marine environment. Uncoated and different salt-coated samples (100 wt.% NaCl, 75 wt.% Na_(2-) SO_4 + 25 wt.% NaCl, and 90 wt.% Na_2SO_4 + 5 wt.% NaCl + 5 wt.% V_2O_5) were exposed in air at 550 and 650℃ under cyclic heating and cooling for 100 h. Weight gain was studied for both uncoated and salt-coated samples. X-ray diffraction, scanning electron microscopy, and electron dispersive spectroscopy were used to characterize the oxidation and corrosion products. A possible mechanism of corrosion, based on the corrosion compounds, is discussed. The variation in weight gain with time showed a parabolic growth of oxides. Coating with NaCl was found to be detrimental both at 550℃ as well as 650℃. On the other hand, the salt mixture of NaCl and Na_2SO_4 had no effect at 550℃; however, it was detrimental at higher temperature of 650℃. Coatings of salt mixture of Na_2SO_4, NaCl, and V_2O_5 caused very slow oxidation at both the temperatures. Increase in thickness of salt coating was observed to enhance the rate of hot corrosion. Among the three types of salt coatings, the coating of NaCl was found to be most damaging both at 550 and 650℃.
机译：进行这项研究以评估Fe-Ni基高温合金IN718在550和650℃下的氧化和热腐蚀行为，以探索其在海洋环境中作为涡轮发动机组件的性能。未涂层和不同盐涂层的样品（100 wt。％NaCl，75 wt。％Na_（2-）SO_4 + 25 wt。％NaCl和90 wt。％Na_2SO_4 + 5 wt。％NaCl + 5 wt。％V_2O_5）在550和650℃的空气中循环加热和冷却100小时。研究了未涂层和盐涂层样品的重量增加。 X射线衍射，扫描电子显微镜和电子分散光谱用于表征氧化和腐蚀产物。讨论了基于腐蚀化合物的可能腐蚀机理。重量增加随时间的变化表明氧化物呈抛物线状增长。发现在550℃和650℃下都用NaCl涂层有害。另一方面，NaCl和Na_2SO_4的盐混合物在550℃下没有作用;但是，在650℃的高温下是有害的。 Na_2SO_4，NaCl和V_2O_5的盐混合物的涂层在两个温度下均导致非常缓慢的氧化。观察到盐涂层厚度的增加可提高热腐蚀速率。在这三种类型的盐涂层中，NaCl涂层在550和650℃时损坏最大。

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