Abstract A model Fe-9Cr alloy was exposed to various H 2 CO 2 CH 4 mixtures providing different oxygen pressures and carbon activities at 800 °C. Three oxidation modes and three oxygen pressure ranges have been observed. At low pressures (Range I) only thin external Cr 2 O 3 scales formed. An intermediate range (Range II) produced an internal precipitation of Cr 2 O 3 and Cr carbide without an external scale. Higher pressures (Range III) produced external FeO x scales plus an internal oxidation of Cr. Two critical oxygen pressures for the transitions between the three oxidation modes were observed and also calculated in reasonable agreement with the experimental results.

中文翻译：

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Fe-9Cr合金在800℃不同氧压下的同时氧化和渗碳

摘要 将模型 Fe-9Cr 合金暴露于各种 H 2 CO 2 CH 4 混合物中，该混合物在 800 °C 下提供不同的氧压和碳活性。已观察到三种氧化模式和三种氧气压力范围。在低压（范围 I）下，仅形成薄的外部 Cr 2 O 3 鳞片。中间范围（范围 II）产生 Cr 2 O 3 和 Cr 碳化物的内部沉淀，没有外部氧化皮。更高的压力（范围 III）会产生外部 FeO x 氧化皮以及 Cr 的内部氧化。观察到三种氧化模式之间转变的两个临界氧压力，并且计算结果与实验结果合理一致。