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

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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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Acknowledgments

This research was supported by German Research Foundation through Grant No. MA 2505/3-1.

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Authors and Affiliations

  1. Foundry Institute, RWTH Aachen University, Intzestrasse 5, 52072, Aachen, Germany

    Fu Wang, Dexin Ma & Andreas Bührig-Polaczek

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  1. Fu Wang
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  2. Dexin Ma
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  3. Andreas Bührig-Polaczek
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Correspondence to Fu Wang.

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Manuscript submitted June 4, 2017.

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Wang, F., Ma, D. & Bührig-Polaczek, A. Eutectic Formation During Solidification of Ni-Based Single-Crystal Superalloys with Additional Carbon. Metall Mater Trans A 48, 5442–5448 (2017). https://doi.org/10.1007/s11661-017-4317-1

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  • DOI: https://doi.org/10.1007/s11661-017-4317-1

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