A survey of fatigue data for Ti-6Al-4V is presented, a collation of several hundred data points. When tested in fully reversed loading, wrought and additively manufactured (AM) materials show similar behaviours until ~105 cycles, after which the AM specimens show noticeably poorer fatigue strengths than wrought materials. Under high cycle conditions the AM materials show noticeably reduced fatigue strengths, and this has been attributed to the increase in crack initiation of AM materials. Under tension-tension loading conditions a large scatter in fatigue lifetime was obtained, with lamellar structures showing significantly depressed fatigue strengths compared to globular structures. No difference in behaviour between wrought and AM could be seen in this case.
- Additive manufacturing