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

Costa, A. M.S.; Oliveira, J. P.; Escobar, J. D.; Salvador, C. A.F.; Monteiro, M. J.; Poplawsky, J. D.; Nunes, C. A.; Ramirez, A. J.; Tschiptschin, A. P.

doi:10.1016/j.matlet.2021.131377

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

Journal Article · Sun Nov 28 00:00:00 EST 2021 · Materials Letters

DOI:https://doi.org/10.1016/j.matlet.2021.131377· OSTI ID:1883663

Costa, A. M.S. ^[1]; Oliveira, J. P. ^[2]; Escobar, J. D. ^[3]; Salvador, C. A.F. ^[3]; Monteiro, M. J. ^[1]; ^[4]; Nunes, C. A. ^[3]; Ramirez, A. J. ^[5]; Tschiptschin, A. P. ^[3]

National Institute of Technology, Rio de Janeiro (Brazil)
Universidade Nova de Lisboa, Caparica (Portugal)
University of Sao Paulo (Brazil)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
The Ohio State Univ., Columbus, OH (United States)

Here, 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.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Fundação para a Ciência e a Tecnologia (FCT - MCTES); USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1883663

Alternate ID(s):: OSTI ID: 1873914

Journal Information:: Materials Letters, Journal Name: Materials Letters Journal Issue: N/A Vol. 309; ISSN 0167-577X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Co-Ni-based superalloys
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atom probe tomography
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On the effect of elemental partitioning to secondary phases after solution and aging heat treatments in a Co-Ni-based superalloy

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