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- Title
Laser Surface Treatment of Ti-6A1-4V for Bio-Implant Application.
- Authors
Biswas, A.; Li, L.; Maity, T. K.; Chatterjee, U. K.; Mordike, B. L.; Manna, I.; Majumdar, J. Dutta
- Abstract
The present study aims at enhancing the wear resistance of Ti-6AI-4V by laser surface melting and nitriding and subsequently, studying the influence of laser surface treatment on the corrosion resistance in a simulated body fluid and also the bio-compatibility. The laser surface treatment is carried out using a high power continuous wave diode laser with argon and nitrogen as shrouding gas. Laser surface melting leads to an increased volume fraction of acicular martensite and a decreased volume fraction of the β phase in the microstructure. Lager surface nitriding leads to the formation of titanium nitride dendrites. The micro-hardness could be improved up to a maximum of 450 Hv in lager surface melting and 900-950 Hv in the case of laser surface nitriding as compared to 260 Hv of the as-received substrate. Surface melting increases the corrosion potential (Ecorr) and primary potential for pit formation (Epp1) significantly as compared to the as-received Ti-6AI-4V. However, when processed under similar conditions, surface nitriding shifts Ecorr marginally in the more noble direction, and increased Epp1 as compared to Ti-6AI-4V. The biocompatibility behaviour shows a superior cell viability on surface nitriding and an inferior cell viability on surface melting as compared to the as-received Ti-6AI-4V.
- Subjects
LASERS; NITRIDES; FUSION (Phase transformation); NITROGEN; CORROSION &; anti-corrosives; ALLOYS
- Publication
Lasers in Engineering (Old City Publishing), 2007, Vol 17, Issue 1/2, p59
- ISSN
0898-1507
- Publication type
Article