Gamma-gamma prime-gamma double prime dual-superlattice superalloys

Mignanelli, P. M.; Jones, Nicholas Blurton; Pickering, Ed; Messé, O.M.D.M.; Rae, C.M.F.; Hardy, MC; Stone, H.J.

doi:10.1016/j.scriptamat.2017.04.029

Cited by 95 publications

(33 citation statements)

References 13 publications

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“…Powder metallurgy (PM) Ni-based superalloys have been widely used for high pressure turbine disc applications in aeroengines due to their excellent mechanical properties and exceptional resistance to environmental damage such as oxidation at elevated temperatures [1][2][3][4][5]. However, in these more advanced aeroengines, the PM Ni-based superalloys are required to work at higher temperatures to increase turbine inlet temperature for the sake of increasing the thrust-weight ratio and improving the fuel efficiency.…”

Section: Introductionmentioning

confidence: 99%

Role of oxygen in enhanced fatigue cracking in a PM Ni-based superalloy: Stress assisted grain boundary oxidation or dynamic embrittlment?

et al. 2018

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Section: Introductionmentioning

confidence: 99%

Role of oxygen in enhanced fatigue cracking in a PM Ni-based superalloy: Stress assisted grain boundary oxidation or dynamic embrittlment?

et al. 2018

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“…[22] More recently, a new dual-superlattice superalloy reinforced by appreciable and comparable volume fractions of both c¢ and c¢¢ has been reported. [23,24] This alloy has been shown to possess excellent room and elevated temperature strengths. In this work, we report on the time-temperature-transformation behavior of this new dual-superlattice superalloy and its age-hardenability following a range of thermal exposures.…”

Section: Introductionmentioning

confidence: 99%

On the Time-Temperature-Transformation Behavior of a New Dual-Superlattice Nickel-Based Superalloy

Mignanelli

Jones

Hardy

et al. 2017

Metall Mater Trans A

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Recent research has identified compositions of nickel-based superalloys with microstructures containing appreciable and comparable volume fractions of c¢ and c¢¢ precipitates. In this work, an alloy capable of forming such a dual-superlattice microstructure was subjected to a range of thermal exposures between 873 K and 1173 K (600°C and 900°C) for durations of 1 to 1000 hours. The microstructures and nature of the precipitating phases were characterized using synchrotron X-ray diffraction and electron microscopy. These data have enabled the construction of a T-T-T diagram for the precipitating phases. Hardness measurements following each thermal exposure have identified the age-hardening behavior of this alloy and allowed preliminary mechanical properties to be assessed.

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“…Table I shows the nominal composition of IN718 and a derivative IN718M without γ forming elements. Recent studies aim at deliberate co-precipitation of γ and γ to exploit ripening inhibiting effects [6,7] and a dual lattice microstructure [8,9]. IN718 powders also gain importance for additive manufacturing in the industrial environment [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Phase-field modeling of γ/γ″ microstructure formation in Ni-based superalloys with high γ″ volume fraction

et al. 2020

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The excellent mechanical properties of the Ni-based superalloy IN718 mainly result from coherent γ precipitates. Due to a strongly anisotropic lattice misfit between the matrix and the precipitate phase, the particles exhibit pronounced plate-shaped morphologies. Using a phase-field model, we investigate various influencing factors that determine the equilibrium shapes of γ precipitates, minimizing the sum of the total elastic and interfacial energy. Upon increasing precipitate phase fractions, the model predicts increasingly stronger particle-particle interactions, leading to shapes with significantly increased aspect ratios. Matching the a priori unknown interfacial energy density to fit experimental γ shapes is sensitive to the phase content imposed in the underlying model. Considering vanishing phase content leads to 30 % lower estimates of the interfacial energy density, as compared to estimates based on realistic phase fractions of 12 %. We consider the periodic arrangement of precipitates in different hexagonal and rectangular superstructures, which result from distinct choices of point-symmetric and periodic boundary conditions. Further, non-volume conserving boundary conditions are implemented to compensate for strains due to an anisotropic lattice mismatch between the γ matrix and the γ precipitate. As compared to conventional boundary conditions, this specifically tailored simulation configuration does not conflict with the systems periodicity and provides substantially more realistic total elastic energies at high precipitate volume fractions. The energetically most favorable superstructure is found to be a hexagonal precipitate arrangement.c 2020. The manuscript is made available under the license CC-BY-NC-ND 4.0

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Gamma-gamma prime-gamma double prime dual-superlattice superalloys

Cited by 95 publications

References 13 publications

Role of oxygen in enhanced fatigue cracking in a PM Ni-based superalloy: Stress assisted grain boundary oxidation or dynamic embrittlment?

Role of oxygen in enhanced fatigue cracking in a PM Ni-based superalloy: Stress assisted grain boundary oxidation or dynamic embrittlment?

On the Time-Temperature-Transformation Behavior of a New Dual-Superlattice Nickel-Based Superalloy

Phase-field modeling of γ/γ″ microstructure formation in Ni-based superalloys with high γ″ volume fraction

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