Fatigue fracture of laser PBF titanium alloy

icaf2023 Tracking Number 112

Additive Manufacturing (AM) is expected to enable weight reduction, cost saving as well as time reduction due to high freedom of design. Fatigue properties of AM Ti-6Al-4V by laser powder bed fusion (PBF) is relevant to its process parameters. In order to control the fatigue properties of Ti-6Al-4V ELI manufactured by selective laser PBF, fracture mechanism was investigated by fatigue tests and fatigue life cycle prediction. Fatigue samples were prepared with different build parameters and post process, which include heat treatment, HIP and machining. It was revealed the surface defects or internal defects were observed at the fatigue crack initiation sites. With the dimensional feature of these defects at the fatigue crack initiation sites, fatigue crack propagation cycles were calculated and compared with the experimental results. Keywords: Additive Manufacturing, AM, Ti-6Al-4V, Fatigue life prediction