Oxidation induced crack closure in a nickel base superalloy: A novel phenomenon and mechanism assessed via combination of 2D and 3D characterization

Tan, Yuanguo; Gao, Nong; Reed, P.A.S.

doi:10.1016/j.msea.2022.144311

Cited by 5 publications

(1 citation statement)

References 40 publications

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“…21,22 For DS superalloys, another very important industrial material system, related research is much less, partly due to the difficulty in aligning a specific crystal orientation to the loading direction. In a DS system, columnar grains grow along [001] direction (the solidification direction), 23,24 while the direction perpendicular to the solidification direction has a random secondary crystal orientation. The grain sizes are also large, often in the order of millimeters.…”

Section: Introductionmentioning

confidence: 99%

The behavior of anisotropic fatigue short crack initiation and propagation for a directionally solidified superalloy CM247LC at room temperature

Tan

Octaviani

Gao

et al. 2023

Fatigue Fract Eng Mat Struct

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The effects of mechanical and microstructural anisotropy on short fatigue crack initiation and propagation behaviors of a directionally solidified superalloy have been studied. An unusual result was found where the fatigue lives of specimens with grains longitudinally aligned along the loading direction fail at lower lifetimes than specimens with transversely loaded grains when the applied stress is close to the yield stress. This is mainly attributed to the lower Young's modulus of the longitudinal specimen, which induces more local plastic strain (at stress concentration features) leading to earlier crack initiation and faster crack propagation under the applied test stress.

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Section: Introductionmentioning

confidence: 99%

The behavior of anisotropic fatigue short crack initiation and propagation for a directionally solidified superalloy CM247LC at room temperature

Tan

Octaviani

Gao

et al. 2023

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

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The finding of anisotropic compatibility of grain boundaries in a directionally solidified superalloy

Tan,

Zhang,

Gao

et al. 2024

J Mater Sci

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The anisotropic compatibility of grain boundaries (GBs) is found in a directionally solidified superalloy, when loading is aligned with (L sample) or transverse (T sample) to the grain growth direction. The greater compatibility of GBs is shown in the L sample by calculating the parameter m′ of the GBs using two developed models. The first model considers the theoretical scenario that grains grow along the perfect [001] orientation, and the compatibility between the neighbouring grains with all kinds of orientation difference is calculated. The second model, termed as Schmid-factor-tolerance model, considers the effects of asymmetrical slip systems caused by the deviation of grain growth direction from the [001] orientation in a real microstructure. Validation of the model is achieved through fatigue tests, demonstrating its capability to interpret and predict the crack initiation behaviours at grain boundaries. Combined with the fatigue tests to illustrate the anisotropic fracture behaviours of the L and T specimens, it shows that the intergranular cracks are more likely to occur in the T specimen with poor compatibility, which proves the capability of predicting the intergranular cracks for the Schmid-factor-tolerance model.

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Small crack propagation and closure behaviours and mechanisms in a powder metallurgy superalloy at high temperature in air

Yang

Zhao

et al. 2023

International Journal of Fatigue

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Oxidation induced crack closure in a nickel base superalloy: A novel phenomenon and mechanism assessed via combination of 2D and 3D characterization

Cited by 5 publications

References 40 publications

The behavior of anisotropic fatigue short crack initiation and propagation for a directionally solidified superalloy CM247LC at room temperature

The behavior of anisotropic fatigue short crack initiation and propagation for a directionally solidified superalloy CM247LC at room temperature

The finding of anisotropic compatibility of grain boundaries in a directionally solidified superalloy

Small crack propagation and closure behaviours and mechanisms in a powder metallurgy superalloy at high temperature in air

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