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        Investigation on the Potential of Laser and Electron Beam Additively Manufactured Ti–6Al–4V Components for Orthopedic Applications

        Mohamad Reza Bandekhoda,Mohammad Hossein Mosallanejad,Masoud Atapour,Politecnico di Torino,Abdollah Saboori 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.1

        In the present study, corrosion properties and biocompatibility of as-built and as-polished Ti–6Al–4V samples fabricatedby Electron Beam Melting (EBM) and Selective Laser Melting (SLM) were investigated and compared with a conventionalsample as a reference. Optical microscope, Scanning Electron Microscope equipped with Energy Dispersive Spectroscopy,and X-ray diffraction analysis were employed for studying the microstructure and composition of the samples. Polarization,electrochemical impedance, and immersion tests were carried out to investigate the corrosion behavior and bioactivity ofthe samples in the Simulated Body Fluid solution. The results revealed that the EBM samples exhibited a superior corrosionresistance compared to the SLM one, thanks to the absence of low corrosion resistant α′ martensitic phases and a higher fractionof β phase in the EBM samples. It was also observed that while the wrought Ti–6Al–4V samples had a higher corrosioncurrent density than the additively manufactured ones, both EBM and SLM processes had a lower corrosion resistance in theas-built state than in the as-polished. The immersion tests in the SBF solution revealed a more significant bioactivity for theEBM samples than the SLM samples. Higher levels of the β phase in the EBM microstructure stimulated the nucleation andgrowth of the apatite on the sample surface. Also, higher surface roughness in the as-built samples improved the bioactivityby increasing the metal/electrolyte interface and thus forming more OH−groups on the Ti alloy surface.

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