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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