Effect of aluminide particle distribution on the high temperature crack growth characteristics of a Co-Ni-Fe superalloy
- Univ. of South Carolina, Columbia, SC (United States)
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.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 541018
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 7 Vol. 37; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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