Recrystallization of L-605 cobalt superalloy during hot-working process

Julien Favre, Yuichiro Koizumi, Akihiko Chiba, Damien Fabregue, Eric Maire

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The mechanical behavior of Co-20Cr-15W-10Ni alloy is studied by compression tests at high temperature. Microstructures after deformation are evaluated using SEM-EBSD. Significant grain refinement occurs by dynamic recrystallization for high temperature and low strain rate (T>1100°C, ε <0.1s -1), and at high strain rate (ε ∼10s -1). Dynamic recrystallization is discontinuous and occurs by grain boundaries nucleation, leading to a necklace structure. The nucleation mechanism is most likely to be bulging of grain boundaries. However, recrystallization occurs also by rotation of annealing twins which can bulge as well. The modeling of mechanical behavior gives a fair quantification of flow softening due to dynamic recrystallization, indicating the progress of dynamic recrystallization with deformation.

Original languageEnglish
Title of host publication3rd International Symposium on High-Temperature Metallurgical Processing - Held During the TMS 2012 Annual Meeting and Exhibition
Pages257-264
Number of pages8
Publication statusPublished - 2012 May 15
Event3rd International Symposium on High-Temperature Metallurgical Processing - TMS 2012 Annual Meeting and Exhibition - Orlando, FL, United States
Duration: 2012 Mar 112012 Mar 15

Publication series

NameTMS Annual Meeting

Other

Other3rd International Symposium on High-Temperature Metallurgical Processing - TMS 2012 Annual Meeting and Exhibition
CountryUnited States
CityOrlando, FL
Period12/3/1112/3/15

Keywords

  • Cobalt
  • Deformation behavior
  • EBSD
  • Recrystallization
  • Superalloy

ASJC Scopus subject areas

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

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