Grain growth and carbide precipitation in superalloy, UDIMET 520
- Ecole Polytechnique de Montreal, Quebec (Canada)
- National Research Council of Canada, Ottawa, Ontario (Canada)
The results of an experimental study on the grain coarsening behavior, M{sub 23}C{sub 6} carbide precipitation, and secondary MC carbide precipitation kinetics in UDIMET 520 are presented. Primary MC carbides and M(C, N) carbonitrides strongly influence the grain growth, with their dissolution near 1,190 C and 1,250 C, respectively, resulting in two distinct grain coarsening temperatures (GCTs). M{sub 23}C{sub 6} carbides precipitate in the alloy over a wide range of temperatures varying between 600 C and 1,050 C. A discrete M{sub 23}C{sub 6} grain boundary carbide morphology is observed at aging temperatures below 850 C. Secondary MC carbides formed at temperatures ranging between 1,100 C and 1,177 C, in specimens in which primary MC dissolution had been obtained at solution treatment temperatures of 1,190 C to 1,250 C. A schematic time-temperature-transformation (TTT) diagram for understanding the microstructure and precipitation inter-relationships in UDIMET 520 alloy is also presented.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 290267
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 11 Vol. 29; ISSN 1073-5623; ISSN MMTAEB
- Country of Publication:
- United States
- Language:
- English
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