Oxidation effects on the fatigue crack growth behaviour of alloy 718 at high temperature

Molins, Régine; Hochstetter, Gilles; Chassaigne, J.C.; Andrieu, Éric

doi:10.1016/s1359-6454(96)00192-9

Cited by 185 publications

(172 citation statements)

References 24 publications

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“…4. This is very similar to what was observed in cyclic loading of alloy 7 1 8 [16]. Along with the precipitous drop in crack-growth rate came a change in the fracture mode.…”

Section: Cracking Under Fixed Displacementsupporting

confidence: 87%

Dynamic Embrittlement in Alloy 718

Pfaendtner¹,

McMahon²

2001

Superalloys 718, 625, 706 and Various Derivatives (2001)

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The bxygen-induced intergranular cracking of alloy 71 8 under static loads has been found to be similar to that of sulfur-induced cracking in steels, tin-induced cracking in a Cu-Sn alloy, and oxygen-induced cracking in Cu-0.25%Be and in Ni3A1, all under static loads. These are all examples of a type of fracture called "dynamic embrittlement." This appears to be the same phenomenon as observed during cyclic loading of alloy 7 18, especially with extended hold times, and it is considered that the cyclic nature of the loading is incidental to the cracking process.

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“…4. This is very similar to what was observed in cyclic loading of alloy 7 1 8 [16]. Along with the precipitous drop in crack-growth rate came a change in the fracture mode.…”

Section: Cracking Under Fixed Displacementsupporting

confidence: 87%

Dynamic Embrittlement in Alloy 718

Pfaendtner¹,

McMahon²

2001

Superalloys 718, 625, 706 and Various Derivatives (2001)

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“…It has been confirmed that there was deleterious effect of oxygen on the high temperature strength of IN718, especially under creep loading [16,17]. However, further investigation is needed to make clear this point.…”

Section: Discussionmentioning

confidence: 95%

Creep-Fatigue and Thermo-Mechanical Fatigue of Friction-Welded IN 718/MarM247 Dissimilar Joint

Okazaki¹,

Sakaguchi²,

Tran³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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The high temperature strength of the friction welded superalloy joint between cast polycrystalline Mar-M247 and the forged IN718 alloys has been investigated under low cycle and thermomechanical fatigue loadings, in comparison with those of the base materials. The experiments showed that the lives of the dissimilar joints were significantly influenced by the test conditions and loading modes. Not only the lives themselves but also the failure positions and mechanisms were sensitive to the loading mode. Especially under the loading conditions in which the creep-fatigue interaction was pronounced, some specific failure phenomena appeared in the DFW joint. The fracture behavior dependences on the loading modes and test conditions were discussed, based on analyses of the macroscopic elastic follow-up mechanism, the stress state by finite element method, and the inhomogeneous microstructure in the joint.

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“…The detrimental effects of environmental factors, in particular oxygen, on high-temperature fatigue crack growth resistance in nickel alloys have been clearly demonstrated by experimental results and well documented in the literature [1][2][3][4][5][6][7][8][9][10][11]. For polycrystalline nickel superalloys, environmental effects were frequently observed to modify the fracture morphology from transgranular to intergranular during crack growth, as well as to increase the crack growth rates significantly for a given stress intensity factor [5,6,8,9].…”

Section: Introductionmentioning

confidence: 89%

Prediction of crack growth in a nickel-based superalloy under fatigue-oxidation conditions

Tong

Hardy

2010

Engineering Fracture Mechanics

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• This is the author's version of a work that was accepted for publication in the journal Engineering Fracture Mechanics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication.A definitive version was subsequently pub- AbstractPrediction of oxidation-assisted crack growth has been carried out for a nickel-based superalloy at elevated temperature based on finite element analyses of oxygen diffusion, coupled with viscoplastic deformation, near a fatigue crack tip. The material constitutive behaviour, implemented in the finite element code ABAQUS via a user-defined material subroutine (UMAT), was described by a unified viscoplastic model with non-linear kinematic and isotropic hardening rules. Diffusion of oxygen was assumed to be controlled by two parameters, the oxygen diffusivity and deformation-assisted oxygen mobility. Low frequencies and superimposed hold periods at peak loads significantly enhanced oxygen concentration near the crack tip. Evaluations of near-tip deformation and oxygen concentration were performed, which led to the construction of a failure envelop for crack growth based on the consideration of both oxygen concentration and accumulated inelastic strain near the crack tip. The failure envelop was then utilised to predict crack growth rates in a compact tension (CT) specimen under fatigue-oxidation conditions for selected loading ranges, frequencies and dwell periods. The predictions from the fatigue-oxidation failure envelop compared well with the experimental results for triangular and dwell loading waveforms, with marked improvements 2 achieved over those predicted from the viscoplastic model alone. The fatigue-oxidation predictions also agree well with the experimental results for slow-fast loading waveforms, but not for fast-slow waveforms where the effect of oxidation is much reduced.

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Oxidation effects on the fatigue crack growth behaviour of alloy 718 at high temperature

Cited by 185 publications

References 24 publications

Dynamic Embrittlement in Alloy 718

Dynamic Embrittlement in Alloy 718

Creep-Fatigue and Thermo-Mechanical Fatigue of Friction-Welded IN 718/MarM247 Dissimilar Joint

Prediction of crack growth in a nickel-based superalloy under fatigue-oxidation conditions

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