Laser surface treatment of Ti-6Al-4V for bio-implant application

Biswas, A. ; Li, L. ; Maity, T. T. ; Chatterjee, U. K. ; Mordike, B. B. ; Manna, I. ; Majumdar, J. Dutta (2007) Laser surface treatment of Ti-6Al-4V for bio-implant application Lasers in Engineering, 17 (1-2). pp. 59-73. ISSN 0898-1507

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The present study aims at enhancing the wear resistance of Ti-6Al-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. Laser surface nitriding leads to the formation of titanium nitride dendrites. The micro-hardness could be improved up to a maximum of 450 Hv in laser 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-6Al-4V. However, when processed under similar conditions, surface nitriding shifts Ecorr marginally in the more noble direction, and increased Epp1 as compared to Ti-6Al-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-6Al-4V.

Item Type:Article
Source:Copyright of this article belongs to Old City Publishing, Inc..
Keywords:Ti-6Al-4V; Laser; Melting; Nitriding; Wear; Corrosion; Biocompatibility
ID Code:18870
Deposited On:17 Nov 2010 12:27
Last Modified:17 May 2016 03:31

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