Abstract
Inconel 783{reg_sign} is an oxidant-resistant, controlled coefficient of thermal expansion, cobalt-nickel-iron-based superalloy. The matrix ({gamma}) is FCC and can be strengthened by coherent strengthening precipitates ({gamma}{prime}). It has been shown that an aluminum content greater than 5 wt% leads to the formation of body-centered aluminide ({beta}) particles and improved resistance to stress accelerated grain boundary oxygen (SAGBO) embrittlement relative to other low-expansion superalloys. The study described below was undertaken to determine the role of the {beta} phase during creep crack growth, and how its distribution affects the alloy`s SAGBO resistance. Aging of alloy 783 to produce a continuous grain boundary film of {beta} phase results in reduced creep crack growth rates at 538 C compared to heat treatments which do not result in a continuous film. Oxidation studies indicate that the {beta} phase is oxidation resistant and hence may cause increased resistance to SAGBO.
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