Abstract
An investigation has been carried out on the morphological development and structure of the wustite-fayalite scale formed on a ferritic Fe-1.5 wt.% Si alloy exposed to carbon dioxide-carbon monoxide atmospheres at 1000°C. The amorphous silica film formed on the metallographically polished specimens crystallized to β-cristobalite at the reaction temperature. Wustite and fayalite developed within nodules which grew laterally to cover the alloy surface. Concurrent with growth of the nodules externally, oxygen diffusion into the underlying alloy led to precipitation of silica as α-tridymite. This internal oxidation zone was sufficiently depleted in silicon for its transformation to an austenitic phase. A fully developed scale was composed of an external wustite layer and an inner wustite-fayalite conglomerate layer, interspersed with discontinuous fayalite bands.
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This work forms part of a research project sponsored by the American Iron and Steel Institute and the National Research Council of Canada.
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Logani, R.C., Smeltzer, W.W. The development of the wustite-fayalite scale on an iron-1.5 wt.% silicon alloy at 1000°C. Oxid Met 3, 15–32 (1971). https://doi.org/10.1007/BF00604737
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DOI: https://doi.org/10.1007/BF00604737