Deformation Mechanisms and Fatigue Behavior of Prestrained Inconel 718 Superalloy

Kalluri, Sreeramesh; Rao, K.B.S.; Halford, Gary R.; Mcgaw, Michael A.

doi:10.7449/1997/superalloys_1997_595_606

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…This successive shearing leads to a progressive reduction in size up to a point where they offer no resistance to the dislocation movement. 51,52 Crystal plasticity-based constitutive models for cyclic softening in Ni-based superalloys have been proposed by Agaram et al 22 and Le on-C azares et al 23 These studies considered shearing of precipitates during cyclic deformation. Further, Patra et al 53 proposed a constitutive model for annihilation of irradiation-induced defects on their interaction with mobile dislocations that contributes to dislocation channeling and flow softening in irradiated materials during tensile deformation.…”

Section: Cyclic Softeningmentioning

confidence: 99%

Dislocation density‐based constitutive model for cyclic deformation and softening of Ni‐based superalloys

Kumar,

Patra,

Sahu

2024

Fatigue Fract Eng Mat Struct

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A physically‐based constitutive modeling framework is proposed for the cyclic deformation and softening of Ni‐based superalloys. The constitutive model accounts for underlying mechanisms of grain size strengthening, dislocation strengthening, solid solution strengthening, and precipitate strengthening, commonly observed in these alloys. A constitutive model is proposed for the shearing of precipitates on their interaction with glide dislocations during cyclic deformation. This is the primary contributor to the experimentally observed cyclic softening behavior in Ni‐based superalloys. Model predictions of the cyclic stress–strain response and the cyclic softening (quantified in terms of the peak stress) are compared with the experimental counterparts for a range of strain amplitudes under fully‐reversed cyclic loading of Inconel 718 (IN 718). Further, model predictions of precipitate size are also compared with the experimentally measured transmission electron micrographs of precipitate sizes at the end of deformation. Concurrence in the cyclic stress–strain response, peak stress, and precipitate size provides validation for our constitutive modeling framework.

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Section: Cyclic Softeningmentioning

confidence: 99%

Dislocation density‐based constitutive model for cyclic deformation and softening of Ni‐based superalloys

Kumar,

Patra,

Sahu

2024

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

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Comparative evaluation of strain controlled low cycle fatigue behaviour of solution annealed and prior cold worked 316L(N) stainless steel

Srinivasan

2004

International Journal of Fatigue

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Yield of Inconel 718 by Axial-Torsional Loading at Temperatures up to 649°C

Gil

Lissenden²,

Lerch

1999

Journal of Testing and Evaluation

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An experimental program has been implemented to determine small offset yield loci for the nickel-base superalloy In conel 718 (IN718) under axial-torsional loading at elevated temperatures. Initial and subsequent yield loci were determined for solutioned IN718 at 23 and 454°C and for aged (precipitation-hardened) IN718 at 23 and 649°C. The shape of the initial yield loci for solutioned and aged IN718 agrees well with the von Mises prediction. However, in general, the centers of initial yield loci are eccentric to the origin due to a strength-differential (S-D) effect that increases with temperature. Subsequent yield loci exhibit kinematic and distortional hardening, and solutioned IN718 shows a weak cross effect. This work demonstrates that it is possible to determine yield surfaces for metallic materials at temperatures up to at least 649°C using multiple probes of a single specimen. The experimental data are first of their kind for a superalloy at these temperatures and will enable a better understanding of multiaxial material response.

show abstract

Deformation Mechanisms and Fatigue Behavior of Prestrained Inconel 718 Superalloy

Cited by 3 publications

References 16 publications

Dislocation density‐based constitutive model for cyclic deformation and softening of Ni‐based superalloys

Dislocation density‐based constitutive model for cyclic deformation and softening of Ni‐based superalloys

Comparative evaluation of strain controlled low cycle fatigue behaviour of solution annealed and prior cold worked 316L(N) stainless steel

Yield of Inconel 718 by Axial-Torsional Loading at Temperatures up to 649°C

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