Fatigue behaviour of Ti6Al4V alloy components manufactured by SLM
subjected to HIP and residual stress relief
Abstract
Fatigue behaviour of HIPed and stress relieved Ti6Al4V alloy specimen’s
produced by SLM was analysed (Rε = -1). The HIP process caused a
microstructural transformation decreasing the hardness and monotonic
properties that not allowed fatigue strength increase. A bilinear
behaviour in the elastic strain-fatigue life curve was observed, because
of Young´s modulus decrease during the cyclic elasto-plastic tests
consequence of subgrains formation. The Smith-Watson-Topper and total
strain energy density models showed a good concordance between predicted
and experimental fatigue lives in notched samples.