High temperature deformation and microstructure evolution of NiCo base superalloy TMW-4M3

Takaaki Hara, Toshiki Ishida, Katsunari Oikawa

Research output: Contribution to journalArticle

Abstract

The high temperature deformation and microstructure evolution of NiCo base superalloy TMW-4M3 during the isothermal forging process were studied. A uniform compression test of TMW-4M3 where both the strain rate and compression temperature were controlled showed dynamic recrystallization flow stress. The peak stress and steady stress of the deformation resistance curve were characterized with the Zener-Hollomon parameter. The average grain size after dynamic recrystallization was also correlated with the Zener-Hollomon parameter, but this relationship changed with compression temperature. We found that this temperature dependency was related to the pinning effect of the £A precipitates in the £ matrix and proposed a new prediction model for dynamic recrystallization grain size considering not only the Zener-Hollomon parameter but also the volume fraction of the £A precipitates. This enables us to calculate the average grain size after isothermal forging within an error of 12%.

Original languageEnglish
Pages (from-to)632-640
Number of pages9
JournalMaterials Transactions
Volume61
Issue number4
DOIs
Publication statusPublished - 2020 Jan 1

Keywords

  • Dynamic recrystallization
  • High temperature deformation
  • Isothermal forging
  • Nickelcobalt base superalloy
  • Pinning effect

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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