The effect of microstructure on very high cycle fatigue properties in Ti–6Al–4V
Received 8 December 2009; received in revised form 22 February 2010; accepted 26 February 2010. published online 04 March 2010.
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 the threshold stress intensity factor range is indicated for the sub-surface crack, and a possible mechanism is presented by which sub-surface fractures occur at lower stress levels in the very high cycle regime than do surface-initiated fractures.
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