Phase-field simulation of Suzuki segregation in Co-Ni-based superalloy with Nb-addition

Yuichiro Koizumi, Shou Suzuki, Takuma Otomo, Shingo Kurosu, Yunping Li, Hiroaki Matsumoto, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this study, segregation at stacking faults (SFs) in a Co-Ni superalloy with the composition of Co-33Ni-20Cr-10Mo-xNb [wt%] (x = 0,1,2) has been investigated by phase-field simulation for clarifying the roles of each element in the Suzuki effect which is believed to be responsible for strain-aging. The simulation result suggested that Ni-depletion can be very significant in the absence of Nb, and the deviation in concentration can exceed 4 wt%. The stacking fault energy (SFE) was decreased from 35 mJ/m2 to -775 mJ/m 2 as a result of the segregation. Nb-addition enhanced the Cr-segregation significantly, however, it resulted in increase in SFE although the strain-aging can be enhanced by Nb-addition. The reasons for the discrepancy are discussed from the viewpoint of the effect of Nb-addition on the kinetics and energetics of Cr-segregation.

Original languageEnglish
Pages (from-to)52-57
Number of pages6
JournalIntermetallics
Volume27
DOIs
Publication statusPublished - 2012 Aug

Keywords

  • B. Strain-aging
  • Co-Ni-based alloy
  • Phase-field method
  • Stacking fault
  • Suzuki effect

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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