Fatigue deformation in a polycrystalline nickel base superalloy at intermediate and high temperature: Competing failure modes

Stinville, J.C.; Martin, Étienne; Karadge, M.; Ismonov, Shak; Soare, Monica; Hanlon, Tim; Sundaram, Sairam; Echlin, McLean P.; Callahan, Patrick G.; Lenthe, William C.; Miller, Victoria M.; Miao, Jr‐Ming; Wessman, Andrew; Finlay, Rebecca; Loghin, Adrian; Marte, J.S.; Pollock, Tresa M.

doi:10.1016/j.actamat.2018.03.035

Cited by 128 publications

(47 citation statements)

References 48 publications

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“…The origin of this phenomenon was argued to be due to the elastic incompatibility stresses and the ability for dislocations to travel relatively long distances along the twin boundary as opposed to neighbouring oblique grain boundaries. This observation has also been recorded by Stinville et al [52] and Miao et al [53] who have recorded twin boundary cracking in high-cycle fatigue. At lower stresses, it is therefore likely that the nucleation location shifts from non-metallic inclusionsfor which decohesion and fracture are stress threshold dependent -to twin boundaries.…”

Section: Towards Fatigue Crack Nucleation Mappingsupporting

confidence: 83%

Competing mechanisms of particle fracture, decohesion and slip-driven fatigue crack nucleation in a PM nickel superalloy

Bergsmo

Dunne

2020

International Journal of Fatigue

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Fatigue cracks may initiate around non-metallic inclusions via particle fracture, particle decohesion and slipdriven nucleation. Cohesive zone techniques within microstructurally faithful crystal plasticity modelling validated by micromechanical experiments (HR-DIC and HR-EBSD) are employed to investigate these nucleation phenomena. Particle fracture and decohesion lead to stress redistribution which influences subsequent energy storage driving slip-driven fatigue crack nucleation. Particle fracture and decohesion strengths were determined and using a stored energy criterion, the number of cycles to initiation of the fatigue microcrack was predicted. A threshold applied stress below which decohesion and fracture do not occur was obtained, thus modestly increasing fatigue life.

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Section: Towards Fatigue Crack Nucleation Mappingsupporting

confidence: 83%

Competing mechanisms of particle fracture, decohesion and slip-driven fatigue crack nucleation in a PM nickel superalloy

Bergsmo

Dunne

2020

International Journal of Fatigue

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“…Similarly to what has been observed for fatigue cracks, the most intense bands tend to develop along the long twin boundaries that exhibit a high Schmid factor. However, the influence of length of the twin boundary on the intensity of strain localization under simple tensile loading does not seem to be as important as in fatigue regime [8,50,51].…”

Section: Inconel 718 421 Slip Bands Location and Annealing Twin Bomentioning

confidence: 94%

“…From this point, the bands were separated into two categories. Previous work by Stinville et al [8,[48][49][50][51] and Liu et al [52] has indicated that fatigue cracks will preferentially develop along the long twin boundaries that possess a high Schmid factor and separate crystals of very different elastic modulus. The hierarchical structure of the merged dataset enables isolation of the properties of the twin boundaries which possess parallel slip bands nearby.…”

Section: Inconel 718 421 Slip Bands Location and Annealing Twin Bomentioning

confidence: 99%

Automated and quantitative analysis of plastic strain localization via multi-modal data recombination

Charpagne

Stinville

Callahan

et al. 2020

Materials Characterization

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A multi-modal data recombination method that enables the automated, quantitative and statistical assessment of strain localization as a function of the microstructure is presented. It consists of merging high resolution digital image correlation (HR-DIC) datasets collected in a scanning electron microscope (SEM), with crystallographic data obtained from electron back-scattered diffraction (EBSD). As the data is typically gathered over large areas (about 1 mm 2), this method enables the quantitative assessment of plastic strain localization over hundreds to thousands of grains, yet with a spatial resolution of tens of nanometers. The data is treated in a hierarchical manner so that strain localization phenomena can be studied as a function of phases, texture and grain orientation. The use of discontinuity tolerant DIC codes, such as Heaviside DIC (H-DIC) in the present case, enables identification the active slip system associated with slip band discontinuities. Analyses conducted over thousands of bands in thousands of grains enable the quantitative assessment of fundamental plasticity laws. The capabilities of this method are shown through application to Ti-6Al-4V and Inconel 718 alloys.

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“…Extensive studies have been conducted to investigate the fatigue performance of PM superalloys, in order to develop more fatigue-resistant disc alloys and to promote the application of new PM superalloys in turbine discs so as to optimize disc design. Usually low cycle fatigue tests are employed to evaluate the fatigue performance of disc alloys to obtain S-N curves which can be useful for the total life design of turbine disc and materials ranking approaches [13][14][15][16]. In addition, FCG tests are used to assess the crack growth resistance of disc alloys and to obtain FCG rate information (i.e.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth mechanisms in powder metallurgy Ni-based superalloys—A review

Jiang

Song

Reed

2020

International Journal of Fatigue

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Powder metallurgy (PM) Ni-based superalloys are widely used for aeroengine turbine disc applications due to their excellent mechanical properties and good corrosion resistance at elevated temperatures. Understanding the fatigue crack growth (FCG) mechanisms of PM Ni-based superalloys is important for both disc alloy development and life prediction of disc components in these advanced aeroengines where damage tolerance design prevails. FCG in PM Ni-based superalloys is a complicated function of microstructure, temperature, loading conditions and environment and is usually a consequence of the synergistic effects of fatigue, creep and environmental damage. In this review, the mechanisms controlled by microstructural features including grain size, grain misorientation, γ′ size and distribution on short and long FCG behaviour in PM Ni-based superalloys are discussed. The contribution of creep and environmental damage to FCG has been critically assessed. The competing effects of mechanical damage (i.e. fatigue and creep) and environmental damage at the crack tip are microstructure-sensitive, and usually results in transition between transgranular, mixed-trans-intergranular and intergranular FCG depending on the contribution of environmental damage to FCG processes.

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Fatigue deformation in a polycrystalline nickel base superalloy at intermediate and high temperature: Competing failure modes

Cited by 128 publications

References 48 publications

Competing mechanisms of particle fracture, decohesion and slip-driven fatigue crack nucleation in a PM nickel superalloy

Competing mechanisms of particle fracture, decohesion and slip-driven fatigue crack nucleation in a PM nickel superalloy

Automated and quantitative analysis of plastic strain localization via multi-modal data recombination

Fatigue crack growth mechanisms in powder metallurgy Ni-based superalloys—A review

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