Dynamic recrystallization and microstructure evolution of a powder metallurgy nickel-based superalloy under hot working

Yanhui Liu, Yongquan Ning, Zekun Yao, Yuzhi Li, Jingli Zhang, Mingwang Fu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)

Abstract

The deformation behaviors (flow behavior, power dissipation, dynamic recrystallization, and microstructure evolution) of a typical powder metallurgy nickel-based superalloy were investigated in compression tests at temperatures range of 1020-1140 °C and strain rates range of 0.001-1.0 s-1with the true strains of 0.3, 0.5, and 0.7, respectively. The efficiency of power dissipation can be shown by the power dissipation maps at different true strains. The results showed that true strain had a great effect on the power dissipation. Besides, the deformed microstructures were investigated. The processes of microstructure evolution at different deformation temperatures and strain rates are different. The continuous dynamic recrystallization takes place at the deformation condition of 1080 °C/0.1 s-1. The fine and uniform dynamic recrystallized grains gradually replace the pre-existing grains with the increase of true strain. The discontinuous dynamic recrystallization takes place at the deformation condition of 1110 °C/0.001 s-1. The fine dynamic recrystallized grains grow up and a part of new fine grains appear in the dynamic recrystallized grains because of the periodic dynamic recrystallization.
Original languageEnglish
Pages (from-to)2164-2172
Number of pages9
JournalJournal of Materials Research
Volume31
Issue number14
DOIs
Publication statusPublished - 28 Jul 2016

Keywords

  • deformation behavior
  • dynamic recrystallization
  • microstructure evolution
  • powder metallurgy superalloy
  • power dissipation

ASJC Scopus subject areas

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

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