Effect of the Particle Size of γ’ Phase on the Mechanical Properties of Ni Base Superalloy

Razumovskiǐ, I. M.; Bykov, Yuriy G.; Beresnev, A.G.; Poklad, V. A.; Razumovskiy, Vsevolod I.

doi:10.4028/www.scientific.net/amr.278.96

Cited by 8 publications

(4 citation statements)

References 4 publications

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“…The parameters of the heterophase microstructure in dispersion-hardening alloys can be changed by heat treatment. In the works of [ 32 , 33 ], it was investigated the influence of the particle size of the γ′- phase on the mechanical properties of the powder Ni—based superalloy EP741NP. It was shown, firstly, that after different heat treatments the experimental histograms of the distribution of γ′- phase particles by the size corresponded to the representations of the L-S-W-theory and secondly, it is possible to vary the particle sizes from 0.5 to 0.2 microns.…”

Section: Features Of the Microstructure Of Ni-based Superalloys And The Kinetics Of Its Diffusion Coarsening Processmentioning

confidence: 99%

Cohesive Strength and Structural Stability of the Ni-Based Superalloys

Razumovskiǐ¹,

Bokstein

Logacheva³

et al. 2021

Materials

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The influence of alloying elements on the cohesive strength of metal heat-resistant alloys (HRAs) is analyzed. Special parameters are introduced to characterize the individual contribution of each alloying element. These are the partial molar cohesion energy of the matrix (χ) and the cohesive strength of the grain boundaries (η) and can be calculated by computer modeling based on the density functional theory. The calculating results of the parameters χ and η in nickel HRAs with mono– and polycrystalline structures alloyed with refractory metals are presented. The calculated data are used to select the chemical composition and develop new nickel (Ni) HRAs with superior creep-rupture properties. It is assumed that a similar approach can be used to search for alloying elements that will contribute to increasing the cohesive strength of additive objects. The resistance of coherent γ-γ’ and lamellar (raft) structures in nickel HRAs to the process of diffusion coarsening during operation is analyzed.

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Section: Features Of the Microstructure Of Ni-based Superalloys And The Kinetics Of Its Diffusion Coarsening Processmentioning

confidence: 99%

Cohesive Strength and Structural Stability of the Ni-Based Superalloys

Razumovskiǐ¹,

Bokstein

Logacheva³

et al. 2021

Materials

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“…Razumovskii et al [9] summarized the relations between yield strength and particle size, which can be presented as [10]:…”

Section: Introductionmentioning

confidence: 99%

“…Razumovskii et al [ 9 ] summarized the relations between yield strength and particle size, which can be presented as [ 10 ]:

where

denotes the antiphase boundary energy, f is the volume fraction and r is the average size of particles. The parabolic r 1/2 dependence suggests that larger precipitates are associated with higher critical stresses.…”

Section: Introductionmentioning

confidence: 99%

Effect of Aspect Ratio on the Deformation Behavior of Dislocation-Free Ni3Al Nanocubes

Wang

Zhou

et al. 2020

Nanomaterials

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This study concentrates on several factors which govern the nanoscale plasticity of in situ compressed dislocation-free Ni3Al nanocubes: cube size, aspect ratio and the presence of grooves. The yield strength of dislocation-free Ni3Al nanocubes exhibits an apparent size dependence. The size dependence is strong when cubes are smaller than 300 nm. Compared with the strength of bulk Ni3Al single crystals, the strength of nanocubes is two orders of magnitude higher, which clearly demonstrates that there is a size effect. Nanocube plasticity strongly depends on the alignment and the shape of the cubes. Deformed aligned nanocubes either display only a few localized deformation events (slip lines) or were homogenously compressed into flats due to multiple slip dislocation-mediated plasticity. For an aligned cube, crack initiation at the intersection of a slip line with a groove in the cube surface was observed. In case of a double cube, crack initiation occurs at surface irregularities, while subsequent crack propagation occurs along one or more slip planes.

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“…Strudel [6] once stated that larger precipitates increase the critical stress of alloys that resemble the γ γ′ / microstructure, with respect to the precipitate cutting event, whereas the critical stress falls with increasing precipitate size according to the Orowan by-passing mechanism. In addition, some experimental studies show that the decrease in the size of regular γ′ phase improves the mechanical properties of Ni-base superalloys [7]. Nevertheless, it is undeniable that changing the precipitate size by heat treatments may introduce other varying structure factors (e.g.…”

Section: Introductionmentioning

confidence: 99%

Primary combination of phase-field and discrete dislocation dynamics methods for investigating athermal plastic deformation in various realistic Ni-base single crystal superalloy microstructures

Gao¹,

Rajendran²,

Fivel³

et al. 2015

Modelling Simul. Mater. Sci. Eng.

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Three-dimensional discrete dislocation dynamics (DDD) simulations in combination with the phase-field method are performed to investigate the influence of different realistic Ni-base single crystal superalloy microstructures with the same volume fraction of γ′ precipitates on plastic deformation at room temperature. The phase-field method is used to generate realistic microstructures as the boundary conditions for DDD simulations in which a constant high uniaxial tensile load is applied along different crystallographic directions. In addition, the lattice mismatch between the γ and γ′ phases is taken into account as a source of internal stresses. Due to the high antiphase boundary energy and the rare formation of superdislocations, precipitate cutting is not observed in the present simulations. Therefore, the plastic deformation is mainly caused by dislocation motion in γ matrix channels. From a comparison of the macroscopic mechanical response and the dislocation evolution for different microstructures in each loading direction, we found that, for a given γ′ phase volume fraction, the optimal microstructure should possess narrow and homogeneous γ matrix channels.

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Effect of the Particle Size of γ’ Phase on the Mechanical Properties of Ni Base Superalloy

Cited by 8 publications

References 4 publications

Cohesive Strength and Structural Stability of the Ni-Based Superalloys

Cohesive Strength and Structural Stability of the Ni-Based Superalloys

Effect of Aspect Ratio on the Deformation Behavior of Dislocation-Free Ni3Al Nanocubes

Primary combination of phase-field and discrete dislocation dynamics methods for investigating athermal plastic deformation in various realistic Ni-base single crystal superalloy microstructures

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