Observation of Change in Misorientation under High Cycle Fatigue for Metallic Material by Inline Measurement of DCT using Synchrotron Radiation

Abstract

A technique for three dimensional grain mapping of polycrystals, called X-ray diffraction contrast tomography (DCT), has been proposed and developed to evaluate damage in fatigue process in recent years. In this study, the change of total misorientation, β during high cycle fatigue test was investigated. The maximum change of β was observed at the grain near the crack initiation site. From these experimentals, total misorientation β is useful for the evaluation of dislocation density on diffraction plane and it is possible to evaluate fatigue damage for each grain by observation of change of β obtained by DCT.