Fatigue crack initiation, slip localization and twin boundaries in a nickel-based superalloy
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- Fatigue crack initiation, slip localization and twin boundaries in a nickel-based superalloy
- Stein, Clayton A.; Cerrone, Albert; Ozturk, Tugce; Lee, Sukbin; Kenesei, Peter; Tucker, Harris; Pokharel, Reeju; Lind, Jonathan; Hefferan, Christopher; Suter, Robert M.; Ingraffea, Anthony R.; Rollett, Anthony D.
- Coherent Σ 3; Crack initiation; Fatigue; LSHR; Slip accumulation; Superalloy
- Issue Date
- PERGAMON-ELSEVIER SCIENCE LTD
- CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE, v.18, no.4, pp.244 - 252
- The study of fatigue in metals, and fatigue initiation specifically, lends itself to analysis via an emerging set of characterization and modeling tools that describe polycrystals on the meso- or microstructural length scale. These include three-dimensional characterization techniques, elastic anisotropic and visco-plastic stress models, new approaches to the statistical description of stress and strain distributions, synthetic microstructure modeling, and improved tools for manipulating the large datasets generated. A specific example of analysis in both 2D and 3D of fatigue cracks in a nickel-based superalloy is given where all the cracks are effectively coincident with coherent twin boundaries. A spectral method is used to analyze the stress state based on a fully anisotropic elastic calculation. The results indicate that, although a high resolved shear stress is associated with the locations of the observed cracks, the length of the trace of the twin boundary is more strongly correlated with crack formation.
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