Direct laser cladding of Co on Ti-6Al-4V with a compositionally graded interface

Majumdar, J. Dutta ; Manna, I. ; Kumar, Ajeet ; Bhargava, P. ; Nath, A. K. (2009) Direct laser cladding of Co on Ti-6Al-4V with a compositionally graded interface Journal of Materials Processing Technology, 209 (5). pp. 2237-2243. ISSN 0924-0136

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09240...

Related URL: http://dx.doi.org/10.1016/j.jmatprotec.2008.05.017

Abstract

In the present study, attempts have been made to fabricate Co layers on the surface of Ti-6Al-4V substrate with a compositionally graded interface by direct laser cladding. Laser processing is carried out by pre-placing the powder (or powder blends) on the substrate, and melting it using a high power continuous wave CO2 laser with Ar as shrouding gas. A compositionally graded interface is developed by applying powder blends of Ti to Co at a ratio of 90:10 near to Ti-6Al-4V substrate to 10:90 prior to development of Co layer. A defect-free microstructure is developed with the presence of Ti2Co and TiCo and Co2Ti at the interface. The volume fraction of individual phase was found to vary with the depth from the Co-clad zone. A significant improvement in microhardness is achieved at the interfacial region. Uniform corrosion resistance increases along the graded interface, but the pitting corrosion resistance is marginally deteriorated. Direct laser clad layer possesses a better biocompatibility than that of as-received Ti-6Al-4V sample.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Titanium; Cobalt; Laser; Direct Laser Cladding; Wear; Corrosion
ID Code:18923
Deposited On:17 Nov 2010 15:28
Last Modified:06 Jun 2011 04:47

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