|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Characterization of Crack Propagation in Ni-based Superalloys Using High Energy X-ray Techniques
||Diwakar Naragani, Michael Sangid, Paul Shade, Peter Kenesei, Hemant Sharma
|On-Site Speaker (Planned)
In this study we employ a suite of techniques, based on x-ray synchrotron experiments that allow us to track a naturally nucleated crack, which is propagating through the bulk of a Ni-based superalloy specimen under cyclic loading. Absorption contrast tomography is performed to determine the complex 3d crack morphology and track the crack tip position. Near-field high energy diffraction microscopy (HEDM) is conducted in the beginning to characterize the microstructure, producing micron resolution grain maps with intragranular orientation spread. The cyclic loading is sequentially interrupted to conduct far field HEDM to characterize the microstructure around the crack. Grain centroid position, averaged orientation and strains are determined for each grain in the sample especially at the crack tip. The reconstructions elucidate temporal and spatial micromechanical evolution of grains as the crack proceeds to grow. Findings are used to study and predict crack growth path and time to failure in Ni superalloys.
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