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Abstract The effect of carbon on hot corrosion behavior of IN-738 was studied with the fused-salt crucible method. Surfaces of corroded specimens have been examined by means of metallography, X-ray diffraction analysis, EPMA, SEM, etc. It was shown that carbon greatly improved the hot-corrosion resistance of IN-738, especially at about 800℃. When the carbon content was below 0.1％, improvement was most remarkable, between 0.1-0.2％, the effect decreased gradually, and beyond 0.2％, it had no further effect. Two possibilities are suggested to account for the beneficial effect of carbon: retardation of basic fluxing corrosion and promotion of formation of a Cr-rich protective oxide film.
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Received: 25 August 1983
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