The effect of heat treatments at 2150 and 2225 F on the microstructure of a cast age-hardenable nickel-chromium alloy was studied. Both heat treatments dissolved the coarse gamma prime precipitate of the as-cast condition. This phase then precipitated in a fine dispersion during air cooling from 2150 and 2225 F. The 2225 F treatment dissolved an MC carbide. During creep tests following this treatment, a heavy agglomerate embrittled the grain boundaries. This appeared to be high-carbon gamma prime which derived from the prior solution of MC at 2225 F.
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