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Synopsis : The isothermal and cyclic oxidation behavior of Fe-26%Cr-21%Ni-1.8%Si alloys with and without superficial Y2O3 powder application as well as similar alloys containing 0.02% and 0.34%Y was examined in air at 1 100•Ž. The oxide scales on the surface of yttrium-containing alloys consisted of (Cr,Fe)2O3, and had excellent adherence to the alloy substrate even in cyclic oxidation. No void formation was observed at the alloyoxide interface, and no silicon-rich inner layer was developed. Such effects of yttrium addition were recognized to be significant even in a fairly early stage of oxidation. The superficially applied Y2O3 powder on the alloy improved the scale adherence, and provided the oxidation morphology similar to that of the yttrium-containing alloy. The effect of Y2O3 powder was also observed in preoxidized specimens.

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Influence of Yttrium Addition and Superficial Y&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt; Powder Application to Fe-26Cr-21Ni-1.8Si Alloy on Its High-temperature Oxidation Behavior