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Development of the inner oxide zone upon steam oxidation of an austenitic stainless steel

机译：奥氏体不锈钢蒸汽氧化后内部氧化区的发展

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The oxidation behaviour of TP 347H FG in mixtures of water, oxygen, and hydrogen was investigated in the temperature range 500-700 deg C for a fixed oxidation time of 336 h. The samples were characterised using reflective light and electron microscopy methods. Thin discontinuous double-layered oxide scales developed during oxidation at 500 deg C, whereas continuous double-layered oxide scales covered the entire sample surface after oxidation at 600 and 700 deg C. The major part of the scale grew into the former alloy grains, whereas Fe-Cr spinel grew along the former alloy grain boundaries. TEM and EELS investigations revealed that the part of the scale that grows into the alloy grains consists of particles of Fe-Cr spinel embedded in a metallic Fe-Ni matrix, which indicates that this part of the scale grows by an internal oxidation mechanism. Growth of the internal oxidation zone at high humidity (46 percent ) is not significantly affected by the type of carrier gas used.
机译：TP 347H FG在水，氧气和氢气的混合物中的氧化行为在500-700摄氏度的温度范围内进行了336小时的固定氧化时间研究。使用反射光和电子显微镜方法对样品进行表征。薄的不连续双层氧化皮在500摄氏度的氧化过程中形成，而连续的双层氧化皮在600和700摄氏度的氧化后覆盖了整个样品表面。氧化皮的大部分长成先前的合金晶粒，而Fe-Cr尖晶石沿以前的合金晶界生长。 TEM和EELS研究表明，氧化皮中生长到合金晶粒中的部分由嵌入金属Fe-Ni基体中的Fe-Cr尖晶石的颗粒组成，这表明氧化皮的这部分是通过内部氧化机制而生长的。内部氧化区在高湿度（46％）下的生长不受所用载气类型的明显影响。

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