Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy

He, Xinbo; Zhang, Jianbo; Peng, Yuanyi; Li, Jingan; Ding, Jian; Liu, Chang; Xia, Xingchuan; Chen, Xueguang; Liu, Yongchang

doi:10.1007/s40195-020-01105-0

Cited by 14 publications

(2 citation statements)

References 83 publications

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“…The frequency of atomic jumps through the interface is essential rather than long distance diffusion. Several authors [51][52][53][54] noticed that even in simple model alloys, the evolution of the c¢ precipitates morphology during aging and heat treatment is not uniform and exhibits differences controlled by many factors. It is worth noting the results by Chen et al [55] who observed an anomalous cyclic coarsening behavior of secondary c¢ precipitates during aging of RR1000 superalloy.…”

Section: Influence Of the Annealing Temperature On The Dissolution Of The C¢ Precipitatesmentioning

confidence: 99%

Investigation of the γ′ Precipitates Dissolution in a Ni-Based Superalloy During Stress-Free Short-Term Annealing at High Homologous Temperatures

Rakoczy

Grudzień-Rakoczy

Hanning

et al. 2021

Metall Mater Trans A

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The equiaxed Ni-based superalloy René 108 was subjected to short-term annealing at five temperatures between 900 °C and 1100 °C. The phase composition, phase lattice parameters, microstructure, stereological parameters, and chemical composition of γ′ precipitates were investigated by thermodynamic simulations, X-ray diffraction, scanning and transmission electron microscopy, and energy-dispersive X-ray spectroscopy. Analysis of the γ and γ′ lattice parameters using the Nelson-Riley extrapolation function showed that the misfit parameter for temperatures 900 °C to 1050 °C is positive (decreasing from 0.32 to 0.11 pct). At 1100 °C, the parameter becomes negative, δ = − 0.18 pct. During the short-term annealing, γ′ precipitates dissolution occurred progressing more rapidly with increasing temperatures. The surface fraction of γ′ precipitates decreased with increasing temperature from 0.52 to 0.34. The dissolution of γ′ precipitates did not only proceed through uninterrupted thinning of each individual precipitate, but also included more complex mechanisms, including splitting. Based on transmission electron microscopy, it was shown that after γ′ precipitates dissolution, the matrix close to the γ/γ′ interface is strongly enriched in Co and Cr and depleted in Al.

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Section: Influence Of the Annealing Temperature On The Dissolution Of The C¢ Precipitatesmentioning

confidence: 99%

Investigation of the γ′ Precipitates Dissolution in a Ni-Based Superalloy During Stress-Free Short-Term Annealing at High Homologous Temperatures

Rakoczy

Grudzień-Rakoczy

Hanning

et al. 2021

Metall Mater Trans A

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“…This change in microstructure will affect the mechanical properties of the material. Therefore, it is very important to study Ni 3 Al-based single crystal superalloy [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Thickness Debit Effect in Creep Performance of a Ni3Al-Based Single-Crystal Superalloy with [001] Orientation

Zhang

Wang

et al. 2023

Crystals

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With the complexity of the structure of aero-engine turbine blades, the blade wall thickness continues to decrease. It is found that when the blade wall thickness decreases to a certain extent, its mechanical properties will decline significantly. It is extremely important to study this phenomenon of a significant decline in mechanical properties caused by wall thickness. In this paper, the creep behavior of a second-generation Ni3Al-based single crystal superalloy with different wall thicknesses and [001] orientation at 980 °C/220 MPa has been studied and compared with the creep life of Φ4 round bar. The experimental results show that the second orientation and the surface affected zone are not the main reasons for the reduction of the life of thin-walled samples under this experimental condition. By analyzing the fracture morphology and deformed microstructure of thin-walled samples with different thicknesses, it is found that the thickness debit effect of the single crystal alloy occurs since the effective stress area of the alloy changes due to internal defects and surface affected zone during the creep process. For thicker samples, the creep life of the alloy can be extended by making the samples undergo certain plastic deformation through better plastic deformation coordination ability, while for thinner samples, the plastic coordination ability is poor, and the ability to extend the creep life through plastic deformation is also weaker when the effective stress area of the alloy changes, which leads to the thinner samples being more prone to fracture.

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New Insights Into the Formation Mechanism of TiN–Al2O3 Composite Inclusions in Nickel-Based Superalloys Based on Density Functional Theory

Long,

Chen,

et al. 2023

Metall Mater Trans B

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Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy

Cited by 14 publications

References 83 publications

Investigation of the γ′ Precipitates Dissolution in a Ni-Based Superalloy During Stress-Free Short-Term Annealing at High Homologous Temperatures

Investigation of the γ′ Precipitates Dissolution in a Ni-Based Superalloy During Stress-Free Short-Term Annealing at High Homologous Temperatures

Thickness Debit Effect in Creep Performance of a Ni3Al-Based Single-Crystal Superalloy with [001] Orientation

New Insights Into the Formation Mechanism of TiN–Al2O3 Composite Inclusions in Nickel-Based Superalloys Based on Density Functional Theory

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