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2023 | OriginalPaper | Chapter

The Formation of Downward Freckles in Nb-Containing Superalloy Remelt Ingots

Authors : A. Mitchell, S. Hans

Published in: Proceedings of the 10th International Symposium on Superalloy 718 and Derivatives

Publisher: Springer Nature Switzerland

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Abstract

A revised mechanism for the formation of downward freckles is proposed. The mechanism accounts for the observations of freckle formation in industrial ingot production. In particular, the association of freckling with process instability is emphasized and is part of the proposed mechanism. Additionally, we suggest that the shrinkage which takes place as the final eutectic solidifies can explain the formation of freckling when the basic gravitational force produced by negative buoyancy in the solidifying liquid appears to be insufficient for the initiation of interdendritic fluid flow. We conclude that the key factor in preventing freckle formation in industrial ingot remelting is the maintenance of process stability.

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Metadata
Title
The Formation of Downward Freckles in Nb-Containing Superalloy Remelt Ingots
Authors
A. Mitchell
S. Hans
Copyright Year
2023
Book
Proceedings of the 10th International Symposium on Superalloy 718 and Derivatives

Print ISBN: 978-3-031-27446-6

Electronic ISBN: 978-3-031-27447-3

Copyright Year: 2023

DOI
https://doi.org/10.1007/978-3-031-27447-3_1

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