Grain structure and texture evolutions during single crystal casting of the Ni-Base superalloy CMSX-4

Seong Moon Seo, In Soo Kim, Je Hyun Lee, Chang Yong Jo, Hirofumi Miyahara, Keisaku Ogi

    Research output: Contribution to journalArticlepeer-review

    44 Citations (Scopus)

    Abstract

    The solidification grain structure and texture evolutions during single crystal (SX) casting of the advanced Ni-base superalloy CMSX-4 have been investigated. In order to understand the development of the solidification grain structure, SX casting experiments were carried out with a specially designed grain selector in a Bridgman directional solidification (DS) furnace. In addition to casting trials, the SX casting process was simulated by a 3-D cellular automaton-finite element (CAFE) model. The predicted solidification grain structure and the texture evolutions were validated by comparison with the microstructural observation and the electron back scattered diffraction (EBSD) results. It was shown that the overall grain structure, crystallographic texture evolution, and the location where the final selection of the single crystal occurs can be predicted well by the present CAFE model. The axial texture evolution of the single crystal was found to be significantly influenced by the grain density at the chill surface. The CAFE predictions also revealed that the geometry of the grain selector plays a significant role in the final selection of the single crystal.

    Original languageEnglish
    Pages (from-to)391-398
    Number of pages8
    JournalMetals and Materials International
    Volume15
    Issue number3
    DOIs
    Publication statusPublished - Jun 1 2009

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys
    • Materials Chemistry

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