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Proceedings 2018, 2(8), 380; https://doi.org/10.3390/ICEM18-05210

Fatigue Damage Evaluation by Diffraction Contrast Tomography Using Ultra-Bright Synchrotron Radiation

1
Department of Mechanical Engineering, Kobe University, Kobe 657-8501, Japan
2
Department of Mechanical Engineering, Shizuoka University, Hamamatsu 432-8561, Japan
Presented at the 18th International Conference on Experimental Mechanics, Brussels, Belgium, 1–5 July 2018.
*
Author to whom correspondence should be addressed.
Published: 9 May 2018
PDF [1066 KB, uploaded 24 May 2018]

Abstract

A three-dimensional grain mapping technique for polycrystalline materials, called X-ray diffraction contrast tomography (DCT), was developed at SPring-8, which is the brightest synchrotron radiation facility in Japan. The developed technique was applied to an austenitic stainless steel. The shape and location of grains could be determined by DCT using the apparatus in a beam line of SPring-8. To evaluate the dislocation structure in fatigue, the total misorientation of individual grains was measured by DCT. The average value of the total misorientation over one sample was increased with the number of cycles. In a grain, the change of the total misorientation was largest for the primary slip plane. The maximum change of the total misorientation in fatigue was larger for planes with larger Schmid factor, and the first fatigue crack initiation was occurred in a grain, which had the greatest change of the total misorientation.
Keywords: synchrotron radiation; diffraction contrast tomography; total misorientation; dislocation density; fatigue damage; crack initiation synchrotron radiation; diffraction contrast tomography; total misorientation; dislocation density; fatigue damage; crack initiation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Nakai, Y.; Shiozawa, D.; Asakawa, N.; Nonaka, K.; Kikuchi, S. Fatigue Damage Evaluation by Diffraction Contrast Tomography Using Ultra-Bright Synchrotron Radiation. Proceedings 2018, 2, 380.

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