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논문 기본 정보

자료유형
학술저널
저자정보
Daeho Jeong (Gyeongsang National University) Yongnam Kwon (Korea Institute of Materials Science) Masahiro Goto (Oita University) Sangshik Kim (Gyeongsang National University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.22 No.5
발행연도
2016.1
수록면
747 - 754 (8page)

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초록· 키워드

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The effect of superplastic forming (SPF) exposure on the ε (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 β 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 β phase became weak with the exposure, offseting the beneficial effect associated with the increment of effective grain size. The effect of SPF exposure on ε-N fatigue and FCP behavior of mill-annealed Ti64 alloy was therefore marginal, excluding the effect of α- case (the oxygen-enriched phase) on the surface.

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