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    Effect of Laser Welding on In-Vitro Bioactivity Properties of Ti6Al4V Joints
    (Korean Inst Metals Materials, 2022) Emre, Hayriye Ertek; Arslan, Sennur
    In this study, the Ti6AI4V alloy, which is used as an implant material in the medical field, was joined with the laser welding method at different welding speeds. The bioactivity features of the Ti6AI4V alloy and its samples joined at different welding speeds were determined by immersing in a simulated body fluid (SBF) for 1, 7, 14, 21 and 28 days. The hydroxyapatite (HA) formation on the surfaces of the samples was determined by calculating the weight gain. The weight loss was calculated by removing the HA from the surface after bioactivity testing. The corrosion rates of the samples were also determined according to the weight loss. In addition, the characterization of the HA formed on the surfaces of the samples was performed. As a result of the investigations, it was determined that the increase in laser welding speed, and therefore the decrease in heat input, positively affected the bioactivity and biocorrosion features of the Ti6Al4V laser welded joints. It was determined that the particle sizes of the HAs of the laser weldments increased with lower heat inputs. It was also observed that the amount of HA nucleated on the laser-welded samples increased in accordance with the increase in the laser welding speed. The laser welded samples that were welded at higher welding speeds and therefore at lower heat inputs, exhibited better biocorrosion behaviors.
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    Effect of laser welding on microstructure and mechanical properties of biomedical Ti6Al4V
    (Springer Heidelberg, 2019) Emre, Hayriye Ertek; Arslan, Sennur
    Ti6Al4V titanium alloys are usually used in chemical industry and biomedical sectors as an implant material. In this study, the effect of laser welding on mechanical and microstructural behavior of biomedical Ti6Al4V sheets with different welding speeds was investigated in detailed. The mechanical properties of laser welded joints are investigated by tensile test and hardness measurements. Fracture morphologies and microstructure evaluations are also investigated. It was found that the laser-welded joints have lower tensile strength and elongation as compared to the base metal. The maximum tensile strength was obtained at 250 cm/min welding speed for laser welded joints. The metallographic investigation revealed that weld metal decorated by coarser acicular alpha ' martensite microstructure within the finer prior-beta grains and grain boundary alpha at higher welding speeds.