Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy

A. J. Goodfellow; E. I. Galindo-Nava; K. A. Christofidou; N. G. Jones; T. Martin; P. A.J. Bagot; C. D. Boyer; M. C. Hardy; H. J. Stone

doi:10.1007/s11661-017-4336-y

Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy

A. J. Goodfellow, E. I. Galindo-Nava, K. A. Christofidou, N. G. Jones, T. Martin, P. A.J. Bagot, C. D. Boyer, M. C. Hardy, H. J. Stone^*

^*Corresponding author for this work

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Abstract

The microstructural stability of nickel-based superalloys is critical for maintaining alloy performance during service in gas turbine engines. In this study, the precipitate evolution in a model polycrystalline Ni-based superalloy during aging to 1000 hours has been studied via transmission electron microscopy, atom probe tomography, and neutron diffraction. Variations in phase composition and precipitate morphology, size, and volume fraction were observed during aging, while the constrained lattice misfit remained constant at approximately zero. The experimental composition of the γ matrix phase was consistent with thermodynamic equilibrium predictions, while significant differences were identified between the experimental and predicted results from the γ′ phase. These results have implications for the evolution of mechanical properties in service and their prediction using modeling methods.

Original language	English
Pages (from-to)	1-11
Number of pages	11
Journal	Metallurgical and Materials Transactions A
Early online date	10 Oct 2017
DOIs	https://doi.org/10.1007/s11661-017-4336-y
Publication status	Published - 1 Mar 2018

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title = "Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy",

abstract = "The microstructural stability of nickel-based superalloys is critical for maintaining alloy performance during service in gas turbine engines. In this study, the precipitate evolution in a model polycrystalline Ni-based superalloy during aging to 1000 hours has been studied via transmission electron microscopy, atom probe tomography, and neutron diffraction. Variations in phase composition and precipitate morphology, size, and volume fraction were observed during aging, while the constrained lattice misfit remained constant at approximately zero. The experimental composition of the γ matrix phase was consistent with thermodynamic equilibrium predictions, while significant differences were identified between the experimental and predicted results from the γ′ phase. These results have implications for the evolution of mechanical properties in service and their prediction using modeling methods.",

author = "Goodfellow, {A. J.} and Galindo-Nava, {E. I.} and Christofidou, {K. A.} and Jones, {N. G.} and T. Martin and Bagot, {P. A.J.} and Boyer, {C. D.} and Hardy, {M. C.} and Stone, {H. J.}",

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doi = "10.1007/s11661-017-4336-y",

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AU - Goodfellow, A. J.

AU - Galindo-Nava, E. I.

AU - Christofidou, K. A.

AU - Jones, N. G.

AU - Martin, T.

AU - Bagot, P. A.J.

AU - Boyer, C. D.

AU - Hardy, M. C.

AU - Stone, H. J.

PY - 2018/3/1

Y1 - 2018/3/1

N2 - The microstructural stability of nickel-based superalloys is critical for maintaining alloy performance during service in gas turbine engines. In this study, the precipitate evolution in a model polycrystalline Ni-based superalloy during aging to 1000 hours has been studied via transmission electron microscopy, atom probe tomography, and neutron diffraction. Variations in phase composition and precipitate morphology, size, and volume fraction were observed during aging, while the constrained lattice misfit remained constant at approximately zero. The experimental composition of the γ matrix phase was consistent with thermodynamic equilibrium predictions, while significant differences were identified between the experimental and predicted results from the γ′ phase. These results have implications for the evolution of mechanical properties in service and their prediction using modeling methods.

AB - The microstructural stability of nickel-based superalloys is critical for maintaining alloy performance during service in gas turbine engines. In this study, the precipitate evolution in a model polycrystalline Ni-based superalloy during aging to 1000 hours has been studied via transmission electron microscopy, atom probe tomography, and neutron diffraction. Variations in phase composition and precipitate morphology, size, and volume fraction were observed during aging, while the constrained lattice misfit remained constant at approximately zero. The experimental composition of the γ matrix phase was consistent with thermodynamic equilibrium predictions, while significant differences were identified between the experimental and predicted results from the γ′ phase. These results have implications for the evolution of mechanical properties in service and their prediction using modeling methods.

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U2 - 10.1007/s11661-017-4336-y

DO - 10.1007/s11661-017-4336-y

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EP - 11

JO - Metallurgical and Materials Transactions A

JF - Metallurgical and Materials Transactions A

ER -

Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy

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