Stein, C.A., S.B. Lee and A.D. Rollett, “An Analysis of Fatigue Crack Initiation Using 2D Orientation Mapping and Full-field Simulation of Elastic Stress Response”, Superalloys 2012, The Minerals, Metals, and Materials Society, 2012.
A preliminary investigation into the microstructural factors potentially associated with fatigue crack initiation along coherent twin boundaries in the nickel-based superalloy LSHR is presented. Cracks appear to initiate predominantly along twin boundaries. Electron Back Scatter Diffraction (EBSD) maps, coupled with calculations of the local elastic stress point to an influence of the Schmid factor. The length of the twin appears, however, to be more strongly correlated with the tendency to crack.
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