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Metallurgical and Materials Transactions B
Published in: Metallurgical and Materials Transactions B 2/2012

01-04-2012

Some New Observations on Freckle Formation in Directionally Solidified Superalloy Components

Authors: Dexin Ma, Qiang Wu, Andreas Bührig-Polaczek

Published in: Metallurgical and Materials Transactions B | Issue 2/2012

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Abstract

To improve the understanding of freckle formation in superalloys, several directional solidification experiments were carried out in a production-scale Bridgman furnace. During the careful inspections of the many cast specimens, several interesting phenomena were observed, indicating new aspects of freckle formation. Accordingly, several new factors influencing the freckle formation, such as the shadow effect, the edge effect, the step effect, and the crystal orientation effect, are proposed. This will contribute to our current understanding of freckle formation and the future development of new measures to minimize freckle defects in directionally solidified components of superalloys.
previous article Effect of Wavelike Sloping Plate Rheocasting on Microstructures of Hypereutectic Al-18 pct Si-5 pct Fe Alloys
next article A Kinetic Study of the Effect of Basicity on the Mold Fluxes Crystallization

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Metadata
Title
Some New Observations on Freckle Formation in Directionally Solidified Superalloy Components
Authors
Dexin Ma
Qiang Wu
Andreas Bührig-Polaczek
Publication date
01-04-2012
Publisher
Springer US
Published in
Metallurgical and Materials Transactions B / Issue 2/2012
Print ISSN: 1073-5615
Electronic ISSN: 1543-1916
DOI
https://doi.org/10.1007/s11663-011-9608-0

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