On the effect of elemental partitioning to secondary phases after solution and aging heat treatments in a Co-Ni-based superalloy

Alessio M. S. Costa, João Pedro Oliveira, J. D. Escobar, C. A. F. Salvador, M. J. Monteiro, J. D. Poplawsky, Carlos Ângelo Nunes, A. J. Ramirez, A. P. Tschiptschin

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1 Citation (Scopus)

Abstract

This paper presents the phase stability and elemental partitioning in a Co-40Ni-10Al-7.5W-10Cr-3Nb-0.06B-0.6C (at.%) superalloy (referred to as 3Nb) after a two-step heat treatment. The resulting microstructure consisted of γ, γ′, MC carbides and µ-Co7W6 phase decorating the regions near and at the grain boundaries. Nb preferentially partitioned to the γ′-phase and other elements such as Ni, Cr and W were responsible for the μ-phase formation.

Original languageEnglish
Article number131377
JournalMaterials Letters
Volume309
DOIs
Publication statusPublished - 15 Feb 2022

Keywords

  • Atom probe tomography
  • Co-Ni-based superalloys
  • EBSD
  • Nb-modified
  • Phase stability
  • Thermodynamic simulation

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