Constructing processing maps for hot working of Co-Ni-Cr-Mo superalloy

Ika Kartika, Yunping Li, Hiroaki Matsumoto, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


In this study, hot forging process of Co-Ni-Cr-Mo superalloy was carried out at temperatures ranging from 950 to 1200°C and strain rates ranging from 0.01 to 30 s-1. In order to obtain an optimum forging condition, various processing maps were constructed, such as a power efficiency map and an instability map, at different strain levels on the basis of a dynamic material model. At a strain of 0.5, temperatures 1050-1200°C and strain rates of 10-30 s-1, dynamic recrystallization was observed with power efficiency values ranging from 35 to 44%. Flow localization due to dynamic strain aging and/or deformation twinning at temperatures 950-1000°C and at low strain rates were observed to be in good agreement with those observed in the instability map.

Original languageEnglish
Pages (from-to)2277-2284
Number of pages8
JournalMaterials Transactions
Issue number9
Publication statusPublished - 2009 Sept


  • Cobalt-nickel-chromium-molybdenum superalloy
  • Deformation twin
  • Dynamic recrystallization
  • Dynamic strain aging
  • Hot working
  • Instability map
  • Power efficiency map
  • Processing maps


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