Enabling Large Superalloy Parts Using Compact Coprecipitation of γ′ and γ′′

Detor, Andrew J.; DiDomizio, Richard; Sharghi-Moshtaghin, Reza; Zhou, Ning; Shi, Rongpei; Wang, Yunzhi; McAllister, Donald; Mills, Michael J.

doi:10.1007/s11661-017-4356-7

Cited by 58 publications

(34 citation statements)

References 18 publications

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“…Concluded from above results, γ ′ phase can provide APB‐shearing induced ordered strengthening effects on yield strength for Inconel 718 alloy. In the modified compact configuration with γ ″ phase reported by some works, the γ ′ deformation behavior may be modified by adjacent γ ″, in turn, the γ ″ deformation is also influenced by neighboring γ ′. For this case, understanding the cooperative deformation mechanisms of γ ″ and γ ′ is necessary for design of newly bimodal γ ″‐ γ ′ hardened 718‐type alloys, which should attract more research attentions.…”

Section: Resultsmentioning

confidence: 98%

“…Axter and Polonis supposed that the high‐energy faults formed within γ ′ phase during deformation may result in the increase of yield strength for bimodal γ ″‐ γ ′ hardened alloy. In progress, recent trials by Detor et al, Mignanelli et al have proved the superior temperature capability benefited from the co‐precipitation of comparable γ ′ and γ ″ phase, and therefore refocused attentions to the underestimated thermal stabilizing role of γ ′ phase in the bimodal γ ″‐ γ ′ configuration.…”

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confidence: 99%

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Deformation Mechanism of L1₂‐γ′ Phase in Bimodal γ″‐γ′ Precipitation Hardened Inconel 718 Superalloy

Zhang

Guo

et al. 2018

Adv Eng Mater

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Deformation mechanism of L1 2 -γ 0 phase in bimodal γ 00 -γ 0 precipitation hardened Inconel 718 alloy is characterized through high resolution transmission electron microscopy (HRTEM) observations. The spherical γ 0 particle exhibits morphological transition toward ellipsoid along the <110> direction and shows deformation anisotropy leading to orientation-dependent lattice misfitting status with γ-matrix. The deformation process of γ 0 phase is determined to be of APB (anti-phase boundary)-type shearing induced by gliding of paired {100}a/2< 110> superpartial dislocations, thus γ 0 phase plays a APB-strengthening role in Inconel 718 alloy.

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Section: Resultsmentioning

confidence: 98%

mentioning

confidence: 99%

Deformation Mechanism of L1₂‐γ′ Phase in Bimodal γ″‐γ′ Precipitation Hardened Inconel 718 Superalloy

Zhang

Guo

et al. 2018

Adv Eng Mater

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“…the Al/Ti ratio along with (Al + Ti)/Nb atomic ratio in IN718, a more thermally and mechanically stable co-precipitate γ ′′ /γ ′ microstructure can be also achieved, which could be due to a higher volume fraction of γ ′ or the smaller γ ′′ precipitate sizes [16]. Such a slow coarsening effect of co-precipitation of γ ′′ /γ ′ also provides a promising solution to avoid the overageing of γ ′ -strengthened disk alloys during processing [17,18]. There is possibly another way to minimize the coarsening of γ ′′ by tailoring its variants.…”

Section: Inconel 718mentioning

confidence: 99%

On the Microstructures and Anisotropic Mechanical Behaviours of Additively Manufactured IN718

Deng

2019

Linköping Studies in Science and Technology. Dissertations

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Additive manufacturing (AM), also known as 3D printing, offers great design flexibility for manufacturing components with complex geometries, and has attracted significant interest in the aero and energy industries in the past decades. Among the commercial AM processes, selective laser melting (SLM) and electron beam melting (EBM) are the two most widely used ones for metallic materials. Inconel 718 (IN718) is a nickel-base superalloy and has impressive combination of good mechanical properties, weldability and low cost. Due to its excellent weldability, IN718 has been intensively applied in the AM filed, to gain more understanding of the AM processes and fully realize AM's potentials. The study objects in the present thesis include both EBM and SLM IN718. The solidification conditions in EBM and SLM are very different and are different to that of conventional cast, leading to unique microstructures mechanical properties. Therefore, this thesis aims to gain better understanding of the microstructures and anisotropic mechanical behaviours of both EBM and SLM IN718, by detailed characterizations and by comparisons with the forged counterpart. The as-built microstructure of EBM IN718 is spatially dependent: the periphery (contour) region has a mixture of equiaxed and columnar grains, while the bulk (hatch) region has columnar grains elongated along the building direction; the last solidified region close to the top sample surface shows segregation and Laves phases, otherwise the rest of the whole sample is well homogenized. Differently, the as-built microstructure of SLM IN718 is spatially homogeneous: the grains is rather equiaxed and with subgrain cell structures. These microstructures also respond differently to the standard heat treatment routines for the conventional counterparts. Anisotropic mechanical properties are evident in the room temperature tensile tests and high temperature dwell-fatigue tests. The anisotropic tensile properties of EBM IN718 at room temperature are more likely due to the directional alignment of porosities along the building direction rather than the strong crys-In these papers I have been the main contributor, performing all the experimental work, characterization, analysis and manuscript writing, under the supervision of Johan Moverare and Ru Lin Peng.

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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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Enabling Large Superalloy Parts Using Compact Coprecipitation of γ′ and γ′′

Cited by 58 publications

References 18 publications

Deformation Mechanism of L1₂‐γ′ Phase in Bimodal γ″‐γ′ Precipitation Hardened Inconel 718 Superalloy

Deformation Mechanism of L1₂‐γ′ Phase in Bimodal γ″‐γ′ Precipitation Hardened Inconel 718 Superalloy

On the Microstructures and Anisotropic Mechanical Behaviours of Additively Manufactured IN718

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

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Enabling Large Superalloy Parts Using Compact Coprecipitation of γ′ and γ′′

Cited by 58 publications

References 18 publications

Deformation Mechanism of L12‐γ′ Phase in Bimodal γ″‐γ′ Precipitation Hardened Inconel 718 Superalloy

Deformation Mechanism of L12‐γ′ Phase in Bimodal γ″‐γ′ Precipitation Hardened Inconel 718 Superalloy

On the Microstructures and Anisotropic Mechanical Behaviours of Additively Manufactured IN718

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

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Deformation Mechanism of L1₂‐γ′ Phase in Bimodal γ″‐γ′ Precipitation Hardened Inconel 718 Superalloy

Deformation Mechanism of L1₂‐γ′ Phase in Bimodal γ″‐γ′ Precipitation Hardened Inconel 718 Superalloy