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Feasibility Study on Application of Synchrotron Radiation μCT Imaging to Alloy Steel for Non-Destructive Inspection of Inclusions

1
Department of Mechanical Engineering, Shizuoka University, Shizuoka 432-8561, Japan
2
Hitachi Construction Machinery Co., Ltd., Tokyo 110-0015, Japan
3
Department of Mechanical Systems Engineering, Tokyo City University, Tokyo 158-8557, Japan
4
Japan Atomic Energy Agency, Hyogo 679-5148, Japan
5
National Institutes for Quantum and Radiological Science and Technology, Hyogo 679-5148, Japan
*
Author to whom correspondence should be addressed.
Metals 2019, 9(5), 527; https://doi.org/10.3390/met9050527
Received: 15 April 2019 / Revised: 4 May 2019 / Accepted: 5 May 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Fracture, Fatigue and Structural Integrity of Metallic Materials)
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Abstract

In order to examine the feasibility of applying synchrotron radiation μCT imaging to alloy steels for non-destructive inspection of inclusions for potential origins of internal fatigue damage in the very high cycle region, synchrotron radiation μCT imaging was utilized for repeated non-destructive observation of Cr-Mo steel. An ultrasonic fatigue testing machine was used in aid of the repeated observation. As a result, it was found that the synchrotron radiation μCT imaging with 70 keV was useful for non-destructive observation of inclusions of more than 10 μm, one of which may be an internal fatigue origin. No identifiable damage was observed around every inclusion, and in the base metal, at least up to 70% of fatigue life was observed in the imaging volume. View Full-Text
Keywords: fatigue; X-ray techniques; alloy steel; synchrotron radiation; μCT imaging; internal fatigue fracture fatigue; X-ray techniques; alloy steel; synchrotron radiation; μCT imaging; internal fatigue fracture
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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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Shimamura, Y.; Matsushita, S.; Fujii, T.; Tohgo, K.; Akita, K.; Shobu, T.; Shiro, A. Feasibility Study on Application of Synchrotron Radiation μCT Imaging to Alloy Steel for Non-Destructive Inspection of Inclusions. Metals 2019, 9, 527.

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