Qualification of Ti6Al4V ELI Alloy Produced by Laser Powder Bed Fusion for Biomedical Applications

Abstract

Ti6Al4V ELI samples were manufactured by Laser Powder Bed Fusion (LPBF) in vertical and horizontal directions and subjected to various heat treatments. Detailed analyses of porosity, microstructure, residual stress, tensile properties, fatigue and fractured surfaces were performed based on X-ray micro computed tomography, scanning electron microscopy and X-ray diffraction methods. Types of fractures and tensile fracture mechanisms in LPBF Ti6Al4V ELI alloy were studied. Detailed analysis of the microstructure and the corresponding mechanical properties were compared with standard specifications for conventional Ti6Al4V alloy (grade 5 and 23) for surgical implant applications. Conclusions regarding mechanical properties and heat treatment of LPBF Ti6Al4V ELI for biomedical applications were made.