Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13116
Title: Laser diffusion nitriding of Ti-6Al-4V for improving hardness and wear resistance
Authors: Man, HC 
Bai, M
Cheng, FT
Keywords: Diffusion nitriding
Hardness
Laser surface treatment
Roughness
Wear
Issue Date: 2011
Publisher: North-Holland
Source: Applied surface science, 2011, v. 258, no. 1, p. 436-441 How to cite?
Journal: Applied surface science 
Abstract: Owing to poor tribological properties, titanium (Ti) alloys are usually surface-treated to enhance their surface properties. Laser surface nitriding, among others, is a common method employed to increase hardness and wear resistance for Ti alloys. Conventional laser nitriding involves surface melting of Ti alloys in a nitrogen atmosphere. This inevitably results in a roughened surface and post-treatment might be required. The present study aims at laser diffusion nitriding Ti alloys without surface melting via carefully selecting the laser processing parameters. The nitrided surface was characterized by X-ray diffractometry (XRD), optical microscopy (OM), scanning-electron microscopy (SEM), and profilometry. The nitride layer formed was about 1.62 μm upon repeated passes. The change in surface roughness resulting from laser diffusion nitriding was only minimal. Nanoindentation measurements revealed that the hardness of the nitride layer was around 11.3 GPa, being about 2.3 times that of Ti-6Al-4V. Ball-on-slab sliding wear test recorded a reduction in wear volume by about 8 times. The results of the present work thus demonstrate the feasibility of diffusion nitriding of Ti-6Al-4V by laser treatment for enhancing its surface properties and performance.
URI: http://hdl.handle.net/10397/13116
ISSN: 0169-4332
EISSN: 1873-5584
DOI: 10.1016/j.apsusc.2011.08.114
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