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Surface engineering of Ti-6Al-4V by nitriding and powder alloying using a CW CO2 laser

Baker, T.N. and Selamat, M.S. (2008) Surface engineering of Ti-6Al-4V by nitriding and powder alloying using a CW CO2 laser. Materials Science and Technology, 24 (2). pp. 189-200. ISSN 0267-0836

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Abstract

A comparison has been made of the laser processing of Ti-6Al-4V (IMI-318) alloy by (a) nitriding under a dilute atmosphere, (b) preplaced 6 µm SiC powder and (c) a combination of (a) and (b). At least six laser tracks were overlapped. Microhardness maps allowed details of the variation in hardness with both melt depth and track number to be determined. The microstructure was characterised and related to the processing parameters, melt track dimensions, hardness and roughness data. It was found that the preheat generated due to the overlapping, influenced the individual track dimensions, microstructure and properties, which were also affected by the laser energy density and the nitrogen concentration in the nitriding atmosphere used in processing. Process (b) was shown to produce the smoothest surfaces, with Ra values <2μm, whilst (c) gave the highest Ra, value, 8.6 μm. These results are considered together with a wide range of data in the literature on laser processed Ti-6Al-4V.

Item type: Article
ID code: 5773
Keywords: laser surface processing, titanium alloys, microstructure, microhardness, surface roughness, materials science, lasers, Mechanical engineering and machinery, Mining engineering. Metallurgy, Mechanical Engineering, Mechanics of Materials, Metals and Alloys, Surfaces, Coatings and Films
Subjects: Technology > Mechanical engineering and machinery
Technology > Mining engineering. Metallurgy
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Depositing user: Strathprints Administrator
Date Deposited: 28 Mar 2008
Last modified: 26 Mar 2015 22:04
URI: http://strathprints.strath.ac.uk/id/eprint/5773

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