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Investigation of eutectic island formation in SX superalloys

✍ Scribed by N. Warnken; D. Ma; M. Mathes; I. Steinbach

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
250 KB
Volume
413-414
Category
Article
ISSN
0921-5093

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✦ Synopsis

We investigated whether the nucleation of the eutectic islands in superalloy solidification occurs in the interdendritic bulk liquid or at the dendritemelt interface. Directionally solidified samples of CMSX-4 and a model superalloy have been analysed by means of light and electron microscopy and by EBSD measurements. For some samples, the solid-melt interface has been revealed by an artificial bubble technique. Additionally, thermodynamic calculations on phase formation and nucleation work as well as phase-field simulations have been performed, using ThermoCalc and MICRESS. The results indicate a kind of epitaxial nucleation mechanism at the solid-liquid interface of the primary β₯ dendrites.

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