Investigation of eutectic island formation in SX superalloys

Research output: Contribution to journalArticlepeer-review

Authors

Colleges, School and Institutes

External organisations

  • ACCESS E.V. at RWTH Aachen University

Abstract

We investigated whether the nucleation of the eutectic islands in superalloy solidification occurs in the interdendritic bulk liquid or at the dendrite-melt 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 γ dendrites.

Details

Original languageEnglish
Pages (from-to)267-271
Number of pages5
JournalMaterials Science and Engineering A
Volume413-414
Publication statusPublished - 15 Dec 2005

Keywords

  • EBSD, Eutectic island, Microstructure simulation, Nucleation, Superalloy

ASJC Scopus subject areas