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07-09-2017 | Issue 11/2017

Metallurgical and Materials Transactions A 11/2017

Eutectic Formation During Solidification of Ni-Based Single-Crystal Superalloys with Additional Carbon

Journal:
Metallurgical and Materials Transactions A > Issue 11/2017
Authors:
Fu Wang, Dexin Ma, Andreas Bührig-Polaczek
Important notes
Manuscript submitted June 4, 2017.

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.

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