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

A. Biswas, L. Li, T. K. Maity, U. K. Chatterjee, B. L. Mordike, I. Manna, J. Dutta Majumdar

Research output: Contribution to journalArticlepeer-review

Abstract

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. © 2007 Old City Publishing, Inc.
Original languageEnglish
Pages (from-to)59-73
Number of pages14
JournalLasers in Engineering
Volume17
Issue number1-2
Publication statusPublished - 2007

Keywords

  • Biocompatibility
  • Corrosion
  • Laser
  • Melting
  • Nitriding
  • Ti-6Al-4V
  • Wear

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