Abstract
Binary Fe–Cr alloys were studied with respect to isothermal oxidation behavior at 900 °C in Ar–O 2 , Ar–H 2 O and Ar–H 2 –H 2 O gas mixtures. Chromium in solution exhibits a higher tendency to become internally oxidized in the gases containing water vapor than in the Ar–O 2 gas because of hydrogen dissolution in the alloy. This mechanism explains why Fe–Cr alloys with intermediate Cr contents (e.g., 10–20 wt.%) exhibit protective chromia-rich scale formation in dry gases but tend to form breakaway-type Fe-rich oxides in wet gases.
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