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Surface modification of HVOF thermal sprayed WC–CoCr coatings by laser treatment

Chikarakara, Evans and Aqida, S.N. and Brabazon, Dermot and Naher, Sumsun and Picas, J.A. and Punset, M. and Forn, A. (2010) Surface modification of HVOF thermal sprayed WC–CoCr coatings by laser treatment. International Journal of Material Forming, 3 (1). pp. 801-804. ISSN 1960-6214

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Abstract

In this work the affects of laser characteristics on microstructure and microhardness of high velocity oxygen fuel sprayed (HVOF) WC–CoCr coatings were investigated. The coating was deposited with a Sulzer Metco WokaJet™-400 kerosene fuel and the laser surface treatments were applied using CO2 laser with 10.6 μm wavelength. Large variations in surface properties were produced from variation in the laser processing parameters. In total, four levels of peak power (100, 200, 300 and 350 W), four levels of spot diameter (0.2, 0.4, 0.6 and 1 mm) and three levels of pulse repetition frequency (PRF) were investigated. An initial set of tests were followed by a more detailed 33 factorial design of experiments. Pulse repetition frequency and duty cycle were set in order to maintain the same overlap in the x and y directions for the raster scanned sample spot impact dimensions. Overlaps of 30% were used in the initial tests and 10% in the more detailed trials. The results have shown that care must be taken to keep the irradiance at a relatively low level compared to uncoated surfaces. High irradiance can in this case result in rough and porous surfaces. Lower levels of irradiance are shown to provide more uniform microstructures, reduced porosity and increased microhardness.

Item Type:Article (Published)
Refereed:Yes
Additional Information:The original publication is available at www.springerlink.com
Uncontrolled Keywords:thermal spraying; laser surface hardening; WC-CoCr; tooling;
Subjects:Engineering > Materials
DCU Faculties and Centres:Research Initiatives and Centres > Materials Processing Research Centre (MPRC)
DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering
Publisher:Springer-Verlag France
Official URL:http://dx.doi.org/10.1007/s12289-010-0891-0
Copyright Information:© Springer-Verlag France 2010
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:European Cooperation in Science and Technology - COST Action 541
ID Code:15870
Deposited On:16 Nov 2010 16:35 by Mr Evans Chikarakara. Last Modified 21 Jul 2014 11:47

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