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

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

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

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

Materials MicroAnalysis

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2 Scopus citations

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 language	English
Article number	131377
Journal	Materials Letters
Volume	309
DOIs	https://doi.org/10.1016/j.matlet.2021.131377
State	Published - Feb 15 2022

Funding

The authors thank Dr. Johnnatan Rodriguez for his help in SEM EBSD analysis. APT was conducted at ORNL's Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility. JPO acknowledges Fundação para a Ciência e a Tecnologia (FCT – MCTES) for its financial support via the project UID/00667/2020 (UNIDEMI)

Keywords

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

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10.1016/j.matlet.2021.131377

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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. (2022). On the effect of elemental partitioning to secondary phases after solution and aging heat treatments in a Co-Ni-based superalloy. Materials Letters, 309, Article 131377. https://doi.org/10.1016/j.matlet.2021.131377

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

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.",

keywords = "Atom probe tomography, Co-Ni-based superalloys, EBSD, Nb-modified, Phase stability, Thermodynamic simulation",

author = "Costa, {A. M.S.} and Oliveira, {J. P.} and Escobar, {J. D.} and Salvador, {C. A.F.} and Monteiro, {M. J.} and Poplawsky, {J. D.} and Nunes, {C. A.} and Ramirez, {A. J.} and Tschiptschin, {A. P.}",

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AU - Costa, A. M.S.

AU - Oliveira, J. P.

AU - Escobar, J. D.

AU - Salvador, C. A.F.

AU - Monteiro, M. J.

AU - Poplawsky, J. D.

AU - Nunes, C. A.

AU - Ramirez, A. J.

AU - Tschiptschin, A. P.

PY - 2022/2/15

Y1 - 2022/2/15

N2 - 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.

AB - 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.

KW - Atom probe tomography

KW - Co-Ni-based superalloys

KW - EBSD

KW - Nb-modified

KW - Phase stability

KW - Thermodynamic simulation

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JO - Materials Letters

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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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Keywords

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