2016年9月
Effect of Superplastic Forming Exposure on Fatigue Crack Propagation Behavior of Ti-6Al-4V Alloy
METALS AND MATERIALS INTERNATIONAL
- ,
- ,
- ,
- 巻
- 22
- 号
- 5
- 開始ページ
- 747
- 終了ページ
- 754
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s12540-016-6075-9
- 出版者・発行元
- KOREAN INST METALS MATERIALS
The effect of superplastic forming (SPF) exposure on the. (strain)-N (number of cycles to failure) fatigue and fatigue crack propagation (FCP) behaviors of Ti-6Al-4V (Ti64) alloy was examined at 298 and 473 K. To simulate the thermal exposure during superplastic forming process, the mill-annealed Ti64 alloy sheet was heated in the vacuum chamber with the pre-determined temperature profile. Notable microstructural change during the SPF exposure included the shape of transformed beta phase from fine and round particles in the as-received specimen to coarse angular particles in the as-exposed specimen. The effective grain size tended to increase with the exposure, enhancing the slip reversibility and the resistance to FCP. However, the crack hindering effect by fine, particle-like beta phase became weak with the exposure, offseting the beneficial effect associated with the increment of effective grain size. The effect of SPF exposure on epsilon-N fatigue and FCP behavior of mill-annealed Ti64 alloy was therefore marginal, excluding the effect of alpha-case (the oxygen-enriched phase) on the surface.
- リンク情報
- ID情報
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- DOI : 10.1007/s12540-016-6075-9
- ISSN : 1598-9623
- eISSN : 2005-4149
- Web of Science ID : WOS:000381929100001