Download all files (6.52MB)

コレクション

引用

説明:

Gigacycle fatigue tests were conducted on additively manufactured (AM) Hastelloy X. Individual AM samples manufactured in the Z and X directions were tested at room temperature, and the results were compared with those for conventional samples. The samples were subjected to ultrasonic fatigue testing up to 10^9 cycles and to fatigue testing up to 10^7 cycles. The microstructures of the AM samples consisted of (101) texture that showed high internal plastic strain. The 0.2 % proof stress levels of the AM samples were much higher than those of the conventional samples. Internal fractures were seen in both the AM and the conventional samples at above 10^7 cycles, indicating conventional fatigue limits at 10^7 cycles to be absent in Hastelloy X. The gigacycle fatigue strengths were comparable between the AM and conventional samples and between the Z and X directions. The conventional fatigue test results for the AM samples revealed longer fatigue lives than those for the conventional samples because of the high 0.2 % proof stress. These results show the ultrasonic fatigue test results of the AM samples to be continuously connected to the conventional fatigue test results, unlike the gap seen with conventional samples. Conventional fatigue limits at 10^7 cycles appear to be absent in Hastelloy X, with new fatigue limits possible in the gigacycle region. The internal fracture origins in the AM samples were solidification cracks or the matrix itself, so we conclude that fatigue failure is not caused by porosities or lack of fusion.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: gigacycle fatigue, additive manufacturing, Hastelloy X, internal fracture, room temperature

刊行年月日: 2026-12-31

出版者: Informa UK Limited

掲載誌:

• Science and Technology of Advanced Materials: Methods (ISSN: 27660400) vol. 6 issue. 1 2607165

研究助成金:

• Amada Foundation AF-2022201-A3

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1080/27660400.2025.2607165

関連資料:

その他の識別子:

連絡先:

更新時刻: 2026-01-31 08:30:04 +0900

MDRでの公開時刻: 2026-01-30 17:46:25 +0900