Investigation of eutectic island formation in SX superalloys

N. Warnken*, D. Ma, M. Mathes, I. Steinbach

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)
179 Downloads (Pure)

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.

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

Keywords

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

ASJC Scopus subject areas

  • General Materials Science

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