The present study aims at enhancing the wear resistance and bio-compatibility of Ti-6Al-4V by laser surface melting and nitriding. Laser surface treatment has been carried out by melting of sand blasted Ti-6Al-4V substrate using a high power continuous wave DIODE laser with argon and nitrogen as shrouding environment (at a gas flow rate of 5 l/min). Following laser surface treatment, a detailed characterization (microstructure, composition and phase) and property evaluation (wear, corrosion, bio-compatibility) of the surface have been carried out. Laser surface melting increased the volume fraction of acicular (quenched-in a) Ti and decreased the volume fraction of b phase in the microstructure (as confirmed by X-ray diffraction analysis). On the other hand, laser surface nitriding led to formation of dendrites of titanium nitrides. The microhardness is improved to a maximum of 450 VHN (in laser surface melting) and 900-950 VHN (in laser surface nitriding) as compared to 260 VHN of as-received substrate. Surface melting increased the corrosion potential (E_corr) and primary potential for pit formation (E_pp1) significantly as compared to as-received Ti-6Al-4V. However, processed under similar conditions, surface nitriding shifted E_corr marginally to the nobler direction, and increased E_pp1 as compared to Ti-6Al-4V. Biocompatibility behavior showed a better cell viability due to surface nitriding and inferior cell viability due to surface melting as compared to as-received Ti-6Al-4V.

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