Aging effects on the microstructure and creep behavior of Inconel 718 superalloy

Kuo, Chung-Ming; Yang, Yi; Bor, Hui‐Yun; Wei, Chao‐Nan; Tai, Chi-Ming

doi:10.1016/j.msea.2008.04.097

Cited by 274 publications

(106 citation statements)

References 2 publications

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“…Comparison between the as received material (Figure 2) and the solutionized material (Figure 4) clearly shows that all δ-phase has been dissolved while the carbides remain undissolved. The first aging treatment at 955 ºC did, as expected, not change the grain size, but also, as expected, platelet δ-phase precipitated at the grain boundaries The amount of δ-phase after one hour is limited [9] as shown in Figure 5. SEM EDS analysis confirms that Ni 3 Nb is the chemical composition of the delta phase, which is also verified by TEM diffraction pattern analysis as shown in Figure 6.…”

Section: Resultssupporting

confidence: 76%

Aging Effects on the γ' and γ'' Precipitates of Inconel 718 Superalloy

Yeh¹,

Kuo²,

Wei³

et al. 2010

7th International Symposium on Superalloy 718 and Derivatives (2010)

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The excellent mechanical properties of Inconel 718 are due to the γ′ and specifically the γ′′ precipitates. Solution heat treatment was performed at 1095 ºC for 1 h followed by air cooling. A δ-phase precipitation heat treatment was made at 955 ºC, 1 h/AC. Finally a double-aging at 720 ºC, 8 h/FC at 57 ºC/h down to 620 ºC, 8 h/AC to precipitate both γ′ and γ′′ phases. The precipitation of both γ′ and γ′′ phases were studied in details after aging treatment by the use of transmission electron microscopy. The spherical precipitates were identified as γ′ phase and the ellipsoidal precipitates were γ′′ phase. At 720 ºC for 8 h both γ′ and γ′′ are growing; the mean long-axis of γ′′ particle is 40 nm and the mean short-axis is 14 nm whereas the average diameter of the spherical γ′ particle is 17 nm. However, at 620 ºC, γ′′ stops growing but γ′ continue to grow and the diameter increases to 21 nm.

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Section: Resultssupporting

confidence: 76%

Aging Effects on the γ' and γ'' Precipitates of Inconel 718 Superalloy

Yeh¹,

Kuo²,

Wei³

et al. 2010

7th International Symposium on Superalloy 718 and Derivatives (2010)

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“…The mechanical properties of forgings are extremely sensitive to the dynamic and interconnected variables, such as strain, strain rate and temperature [20]. Therefore, in recent years, the flow behaviors and microstructural evolution of IN718 have been studied experimentally by many researchers [21][22][23][24][25][26]. However, there have been few investigations on modeling and simulation of microstructure evolution for IN718 superalloy during hot working.…”

Section: Introductionmentioning

confidence: 99%

Mesoscale modeling and simulation of microstructure evolution during dynamic recrystallization of a Ni-based superalloy

Chen

Cui

et al. 2016

Appl. Phys. A

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Microstructural evolution and plastic flow characteristics of a Ni-based superalloy were investigated using a simulative model that couples the basic metallurgical principle of dynamic recrystallization (DRX) with the twodimensional (2D) cellular automaton (CA). Variation of dislocation density with local strain of deformation is considered for accurate determination of the microstructural evolution during DRX. The grain topography, the grain size and the recrystallized fraction can be well predicted by using the developed CA model, which enables to the establishment of the relationship between the flow stress, dislocation density, recrystallized fraction volume, recrystallized grain size and the thermomechanical parameters.

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“…δ phase particles are the result of γ'' transformation to more stable state of Ni 3 Nb over long time exposure at temperatures above 650°C. In addition, the microstructure contains (Nb, Ti)C carbides with orthorhombic structure, localized at grain boundaries, which inhibit grain growth at high temperatures thereby improving creep properties [9,10].…”

Section: Introductionmentioning

confidence: 99%

Accurate determination of damaged subsurface layers in machined Inconel 718

Touazine

Jahazi

Bocher

2016

Int J Adv Manuf Technol

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The machining of high strength materials used in aeronautical applications generates damage on the subsurface layer which can significantly affect the fatigue life of the machined components. It is then important to distinguish between the damages due to machining from those caused by mechanical polishing operations used for sample observation. In this study, a new method is proposed to characterize and quantify properly the affected layer by machining and eliminate the impact from the defects originated during mechanical polishing. A protective layer of nickel coating was deposited on the machined surface. An optimum thickness of 100 µm was determined for the nickel layer to avoid any damage to the subsurface layer during sample preparation. The subsurface layer was analyzed using an automatic Knoop microhardness machine, laser-digital microscope and Electron BackScatter Diffraction (EBSD) microscopy.

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Aging effects on the microstructure and creep behavior of Inconel 718 superalloy

Cited by 274 publications

References 2 publications

Aging Effects on the γ' and γ'' Precipitates of Inconel 718 Superalloy

Aging Effects on the γ' and γ'' Precipitates of Inconel 718 Superalloy

Mesoscale modeling and simulation of microstructure evolution during dynamic recrystallization of a Ni-based superalloy

Accurate determination of damaged subsurface layers in machined Inconel 718

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Aging effects on the microstructure and creep behavior of Inconel 718 superalloy

Cited by 274 publications

References 2 publications

Aging Effects on the &gamma;' and &gamma;'' Precipitates of Inconel 718 Superalloy

Aging Effects on the &gamma;' and &gamma;'' Precipitates of Inconel 718 Superalloy

Mesoscale modeling and simulation of microstructure evolution during dynamic recrystallization of a Ni-based superalloy

Accurate determination of damaged subsurface layers in machined Inconel 718

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Aging Effects on the γ' and γ'' Precipitates of Inconel 718 Superalloy

Aging Effects on the γ' and γ'' Precipitates of Inconel 718 Superalloy