Microstructural evolution in directionally solidified Ni-base superalloy IN792+Hf

S. M. Seo, I. S. Kim, J. H. Lee, C. Y. Jo, Hirofumi Miyahara, K. Ogi

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    Microstructural evolution during directional solidification (DS) of Ni-base superalloy IN792+Hf has been investigated with an emphasis on the γ′ precipitates and MC-type carbides. The quantitative image analyses revealed that the increase in the solidification rate up to 100 μm/s at constant thermal gradient of 178 K/cm resulted in a fine and uniform distribution of γ′ precipitates. The relationship between the as-cast γ′ size and cooling rate was also determined for DS IN792+Hf. In the mean time, the MC carbide size was found to be dependent both on the solidification rate and the S/L interface morphology while the area fraction of MC carbide was significantly influenced by the S/L interface morphology.

    Original languageEnglish
    Pages (from-to)110-114
    Number of pages5
    JournalJournal of Materials Science and Technology
    Volume24
    Issue number1
    Publication statusPublished - Jan 1 2008

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites
    • Mechanics of Materials
    • Mechanical Engineering
    • Polymers and Plastics
    • Metals and Alloys
    • Materials Chemistry

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