Influence of Yttrium Addition and Superficial Y2O3 Powder Application to Fe-26Cr-21Ni-1.8Si Alloy on Its High-temperature Oxidation Behavior
1984 Volume 70 Issue 2 Pages 262-268
Details
1984 Volume 70 Issue 2 Pages 262-268
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 1100°C.
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.
