The results of this study have shown that the initiation of hot corrosion attack of IN-738 and similar alloys is the result of local penetration of the molten salt through the protective oxide scale. This penetration occurs at sites where alloy carbides have been incorporated in the scale. The mechanism of scale breakdown may be that the carbide provides a physical discontinuity in the scale or that it provides a site where the salt may become very acid and dissolve the Cr(Sub 2)O(Sub3) scale. The observation that the effectiveness of the carbides in initiating scale breakdown is influenced strongly by their composition suggests the latter mechanism may be the most important.
Semi-Annual Rept. No. 2, 1 Mar-31 Aug 79
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