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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.

キーワード: computed tomography, gigacycle fatigue, internal fatigue crack, nondestructive inspection, synchrotron radiation light, titanium alloy

刊行年月日: 2023-02-03

出版者: Wiley

掲載誌:

• Fatigue & Fracture of Engineering Materials & Structures (ISSN: 14602695) vol. 46 issue. 6 p. 2338-2347

研究助成金:

• Japan Society for the Promotion of Science 21H04529
• Japan Society for the Promotion of Science 18H03748
• Japan Society for the Promotion of Science 19K14853

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4753

公開URL: https://doi.org/10.1111/ffe.13957

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更新時刻: 2024-09-17 16:30:18 +0900

MDRでの公開時刻: 2024-09-17 16:30:19 +0900