Influence of deposition strategies on tensile and fatigue properties in a wire + arc additive manufactured Ti-6Al-4V

This paper investigates the influence of two different deposition strategies, oscillation and parallel pass, on tensile high cycle fatigue properties a wire + arc additive manufactured Ti-6Al-4V alloy in as-built condition. In build, plasma torch feeder continuously oscillated across wall thickness direction. contrast, four single layers were deposited consecutively same direction along length pass build. Test specimens horizontal vertical orientation with respect to layers. Compared build had lower static strength due its coarser transformation microstructure. However, elongation values similar. The presence columnar primary ? grains has resulted anisotropic values. samples loading axis showed 40% higher than samples. was comparable wrought counterpart greater typical material by casting. At 107 cycles, 600 MPa achieved for both orientations. Only 500 MPa. Fractography analysis that most (about 70%) crack initiation from pores, about 20% initiated microstructural features rest did not failed (runouts at cycles).