The effect of microstructure on very high cycle fatigue properties in Ti-6Al-4V

概要

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Uniaxial tension fatigue tests were conducted on a Ti-6Al-4V alloy that underwent different heat treatments to reveal the effect of microstructures on the very high cycle fatigue properties. The size dependency of threshold stress intensity factor range will be pointed out for the sub-surface crack, and a possible mechanism will be presented for the phenomenon that the sub-surface fractures occur at lower stress levels in the very high cycle regime than do surface-initiated fractures.