A series of Fe-7Cr-12Ni-(0-6)Al-(0-7)Si alloys was oxidized at test temperatures between 800 degrees and 1000 degrees C. The master alloy, Fe-7Cr-12Ni, had no oxidation resistance at temperatures above 800 degrees C. Aluminum additions to the master alloy produced a protective A12O3 layer over the substrate metal which prevented rapid oxidation and allowed time for a Cr2O3 layer to develop underneath. Silicon addition to the master alloy produced an SiO2 oxide sublayer at the metal-oxide interface which, when formed, provided an effective barrier to oxidation. A combination of 1.5-pct-Al and 2.0-pct-Si additions provided the best oxidation protection.
OP; Journal Article
Metallurgical Transactions. A. Physical Metallurgy and Materials Science
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