Fumiyoshi Yoshinaka
(Research Center for Structural Materials/Design and Producing Field/Vibration Control Materials Group, National Institute for Materials Science
)
;
Takashi Nakamura
(Hokkaido University)
;
Hiroyuki Oguma
(Research Center for Structural Materials/Bonding and Manufacturing Field/Polymer Matrix Hybrid Composite Materials Group, National Institute for Materials Science)
;
Nao Fujimura
(Hokkaido University)
;
Akihisa Takeuchi
(Japan Synchrotron Radiation Research Institute (JASRI))
;
Masayuki Uesugi
(Japan Synchrotron Radiation Research Institute (JASRI))
;
Kentaro Uesugi
(Japan Synchrotron Radiation Research Institute (JASRI))
Collection
Citation
Description:
(abstract)The initiation of internal fatigue cracks in very high cycle fatigue of Ti-6Al-4V alloy was investigated using synchrotron radiation X-ray computed tomography (SR-CT). Micro-CT detected 28 cracks that were distributed across the examined volume of Ф1.8 × L 2.5 mm. No apparent correlation was observed between the spatial distribution, initial lengths, and initiation lives of cracks. The crack growth rate of the facet-sized crack varied widely; some cracks propagated rapidly, whereas no crack growth was observed for other cracks over a specific period of time after detection. Using nano-CT, the several grain-sized internal cracks and their microstructures were clearly and nondestructively visualized. In the field of view, many primary α phases were detected; however, no other cracks were observed. The multiple facet initiation site, which is commonly observed for titanium alloys, might not be due to the concurrently initiated facets but may be caused by the small crack growth accompanied by facet formation.
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In Copyright
This is the peer reviewed version of the following article: Characterization of internal fatigue crack initiation in Ti-6Al-4V alloy via synchrotron radiation X-ray computed tomography, which has been published in final form at https://doi.org/10.1111/ffe.13957. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
Keyword: computed tomography, gigacycle fatigue, internal fatigue crack, nondestructive inspection, synchrotron radiation light, titanium alloy
Date published: 2023-02-03
Publisher: Wiley
Journal:
- Fatigue & Fracture of Engineering Materials & Structures (ISSN: 14602695) vol. 46 issue. 6 p. 2338-2347
Funding:
- Japan Society for the Promotion of Science 21H04529
- Japan Society for the Promotion of Science 18H03748
- Japan Society for the Promotion of Science 19K14853
Manuscript type: Author's version (Accepted manuscript)
MDR DOI: https://doi.org/10.48505/nims.4753
First published URL: https://doi.org/10.1111/ffe.13957
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Updated at: 2024-09-17 16:30:18 +0900
Published on MDR: 2024-09-17 16:30:19 +0900
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