Effect of post-solutionizing cooling rate on microstructure and low cycle fatigue behavior of a cast nickel based superalloy

Mehta, Kumud Kant; Mitra, Rahul; Chawla, Sanjay

doi:10.1016/j.msea.2014.06.003

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…[4,8,23,[29][30][31] The slow cooling causes larger c 0 size and sometimes a bimodal distribution. Moreover, slow cooling lengthens the total time required for grain growth and partial dissolution of MC carbides, [32,33] which makes good control over microstructual variables even harder. Clearly, very carefully designed experimentation is needed.…”

Section: Serration Of Grain Boundaries In Metals Andmentioning

confidence: 99%

Grain Boundary Serration in Nickel-Based Superalloy Inconel 600: Generation and Effects on Mechanical Behavior

Tang

Wilkinson

Reed

2018

Metall Mater Trans A

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Grain boundary serration in the superalloy Inconel 600 was studied. Two microstructural variants, one with nonserrated and the other with serrated grain boundaries were generated by altering the heat-treatment conditions, while keeping other aspects of the microstructure unchanged. The effect on the creep response between 700°C and 900°C was measured, and the different failure modes and accumulated damage were quantified using high-angular resolution electron backscatter diffraction analysis in the scanning electron microscope and also by X-ray computed tomography. It is found that serration plays a more crucial role in the high-temperature/low-stress regime when an intergranular cracking mechanism involving cavitation is operative; here it plays a role in improving both creep life and creep ductility. Any effect of serration is less prevalent at low temperatures where transgranular failure is dominant.

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Section: Serration Of Grain Boundaries In Metals Andmentioning

confidence: 99%

Grain Boundary Serration in Nickel-Based Superalloy Inconel 600: Generation and Effects on Mechanical Behavior

Tang

Wilkinson

Reed

2018

Metall Mater Trans A

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“…The divergence in associated cyclic stress response is generally attributed to the change in fatigue damage mechanism. 4,[23][24][25] In precipitate strengthen nickel-base superalloys, at a given Δε/2, the cyclic hardening is normally ascribed to the dislocationdislocation and dislocation-precipitate interactions and corresponding increase in dislocation density. 4,23,24 Whereas precipitates shearing, network formation, and precipitate-free band formation are usually responsible for the softening of the alloy.…”

Section: Discussionmentioning

confidence: 99%

“…It is evident (Figure 4A) that the alloy showed distinct cyclic stress responses at steep and shallow slope regimes. The divergence in associated cyclic stress response is generally attributed to the change in fatigue damage mechanism 4,23–25 . In precipitate strengthen nickel‐base superalloys, at a given Δε /2, the cyclic hardening is normally ascribed to the dislocation–dislocation and dislocation–precipitate interactions and corresponding increase in dislocation density 4,23,24 .…”

Section: Discussionmentioning

confidence: 99%

Effect of carbide precipitation on Coffin–Manson relationship of a polycrystalline nickel‐based superalloy

Kumar

Jena

Paulose

et al. 2022

Fatigue Fract Eng Mat Struct

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This study explores the dual‐slope Coffin–Manson (C–M) behavior of a polycrystalline nickel‐based superalloy, EA, used in turbine engine applications with an emphasis on discerning the micro‐mechanisms responsible for it. The motivation for distinguishing the micro‐mechanisms responsible for bi‐linear C–M behavior stemmed from the earlier evolved comprehensions that state that the fatigue life estimation based on the extrapolation of any single line gives inaccurate results. Transmission electron microscopy (TEM) investigations of fatigue fractured specimens at low strain amplitudes, Δε/2, revealed that dislocations are homogeneously distributed in the γ‐channels and occasionally form networks at γ/γ′ interface. Whereas deformation is heterogeneous at high Δε/2 owing to the complex dislocation reactions. Cr23C6 carbides are precipitated during the high Δε/2 fatigue tests, which act as obstacles for dislocations. The deformation heterogeneity resulting from the dislocation–γ′ precipitate interactions and the dislocation–M23C6 carbide interactions accounts for the dual‐slope C–M behavior.

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“…The samples were dissolved at about 1230 ºC for 2 h. Experimental conditions are shown in Table 2. As a result, as the cooling rate increased, the size of the γ' precipitates decreased and the mechanical properties of the samples increased [11].…”

Section: Discussionmentioning

confidence: 99%

Effects of cooling rate on strength and microstructure of powder metallurgy superalloys

Akca

Gürsel²,

Yıldız³

2017

PEN

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The excellent mechanical properties of powder metallurgy superalloys strongly depend on the microstructure, grain size, morphology, and size distribution of the γ' precipitates. In this study, the effects of cooling rate on strength and microstructure of powder metallurgy superalloys were investigated. Articles were reviewed about this topic and they all were evaluated. Different types of powder metallurgy superalloys such as FGH4096, U720LI, UDIMET 500, MAR-M247, K465, IN738LC, Rene88DT, CM247LC and K5 were selected for this study. These materials were tested in different parameters (temperature and time) and different cooling rates were applied. Test results showed that cooling rate has considerable effects on strength and microstructure of powder metallurgy superalloys. It was observed that the strength increased by the increment of cooling rate. Also, almost homogeneous microstructure was obtained at high cooling rate.

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Effect of post-solutionizing cooling rate on microstructure and low cycle fatigue behavior of a cast nickel based superalloy

Cited by 10 publications

References 16 publications

Grain Boundary Serration in Nickel-Based Superalloy Inconel 600: Generation and Effects on Mechanical Behavior

Grain Boundary Serration in Nickel-Based Superalloy Inconel 600: Generation and Effects on Mechanical Behavior

Effect of carbide precipitation on Coffin–Manson relationship of a polycrystalline nickel‐based superalloy

Effects of cooling rate on strength and microstructure of powder metallurgy superalloys

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