Development of creep damage evaluation method by three-dimensional grain mapping technique using synchrotron radiation

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The three dimensional grain mapping technique for polycrystalline material, that is termed X-ray diffraction contrast tomography (DCT) has proposed. In the present study, the measurements of DCT were conducted in SPring-8 and the condition of measurement and data procedure were discussed. Developed technique was applied to aluminum alloy and stainless steel. It was found that the shape and location of grain can be determined by three-dimensional mapping technique using the apparatus in SPring-8, BL19B2 bending beam line. Next, for evaluation of plastic deformation, the internal grain orientation spread of the individual grain was counted. The grain orientation spread is caused by the mosaicity, which related to the change of microstructure. The grain orientation spread increased with increasing in the tension stress in the plastic deformation region and cyclic loading. It is possible to evaluate fatigue damage in microstructure, such as crack initiation and creep damage, by the DCT technique and using the grain orientation spread as one of the fatigue damage parameters