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Oxidation behavior of a new Fe-Ni-Cr-based alloy in pure steam at 750 degrees C

机译：新型Fe-Ni-Cr基合金在750摄氏度的纯蒸汽中的氧化行为

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摘要

The isothermal oxidation of a new Fe-Ni-Cr-based alloy has been investigated in pure steam at 750 degrees C for exposure time up to 500h using secondary electron microscope (SEM)/ X-ray energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD). Results showed that the alloy was oxidized approximately following a parabolic law with a parabolic rate constant k(p) of 2.36 x 10(-13) g(2)/m(4)/s. As revealed by SEM/EDS and XRD results, a duplex-layered external oxide scale was formed, consisting of a thin outer layer of Ni(Fe, Al)(2)O-4 and a thicker inner layer of (Cr, Mn)(2)O-3. Underneath the external oxide scale, the internal oxidation of Ti to be TiO2 occurred particularly along the grain boundaries of the matrix alloy. Internal oxide of Al2O3 was also observed but at a deeper depth. Based on the detailed compositional and microstructural characterization of the oxidized zone, the mechanism of the external and internal oxidation in steam is presented.
机译：使用二次电子显微镜（SEM）/ X射线能谱仪（EDS）和X射线，研究了一种新的Fe-Ni-Cr基合金的等温氧化，其在750摄氏度的纯蒸汽中暴露时间长达500h。射线衍射（XRD）。结果表明，该合金被近似遵循抛物线定律氧化，抛物线速率常数k（p）为2.36 x 10（-13）g（2）/ m（4）/ s。如SEM / EDS和XRD结果所揭示的，形成了双层复层的外部氧化皮，它由Ni（Fe，Al）（2）O-4的薄外层和（Cr，Mn）的较厚内层组成（2）O-3。在外部氧化物垢之下，Ti变成TiO2的内部氧化特别是沿着基体合金的晶界发生。还观察到Al2O3的内部氧化物，但深度更深。根据氧化区的详细组成和微观结构特征，提出了蒸汽内外氧化的机理。

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