Formation of the Al-rich phase on grain boundary and the creep damage mechanism in directionally solidified Ni-base superalloy

S. Komazaki, T. Shoji

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The microstructural changes and possible resultant microcrack initiation behavior in a directionally-solidified Ni-base superalloy, CM247LC, are investigated during creep to verify the creep damage mechanism. The microstructural changes at and near the grain boundaries of CM247LC includes the: dissolution of grain-boundary M23C6 carbides and local increase of carbon content in γ and γ′ phases; transformation of γ′ to γ to form the γ′-free zone; and formation of the Al-rich phase in the γ′-free zone due to Al release from the γ′ phase. The changes in grain boundary microstructures can be favorable sites for fracture initiation.

Original languageEnglish
Pages (from-to)1945-1949
Number of pages5
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume28 A
Issue number9
DOIs
Publication statusPublished - 1997 Jan 1

ASJC Scopus subject areas

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

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