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- Title
Eutectic Formation During Solidification of Ni-Based Single-Crystal Superalloys with Additional Carbon.
- Authors
Wang, Fu; Ma, Dexin; Bührig-Polaczek, Andreas
- Abstract
γ/ γ′ eutectics' nucleation behavior during the solidification of a single-crystal superalloy with additional carbon was investigated by using directional solidification quenching method. The results show that the nucleation of the γ/ γ′ eutectics can directly occur on the existing γ dendrites, directly in the remaining liquid, or on the primary MC-type carbides. The γ/γ′ eutectics formed through the latter two mechanisms have different crystal orientations than that of the γ matrix. This suggests that the conventional Ni-based single-crystal superalloy castings with additional carbon only guarantee the monocrystallinity of the γ matrix and some γ/ γ′ eutectics and, in addition to the carbides, there are other misoriented polycrystalline microstructures existing in macroscopically considered 'single-crystal' superalloy castings.
- Subjects
EUTECTICS; EUTECTIC alloys; SINGLE crystals; HEAT resistant alloys; SOLIDIFICATION; METAL quenching
- Publication
Metallurgical & Materials Transactions. Part A, 2017, Vol 48, Issue 11, p5442
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-017-4317-1