LASER SUFRACE REMELTING OF HVOF SPRAYED CO-CR-W COATING

1 HOUDKOVÁ Šárka
Co-authors:
1 VOSTŘÁK Marek 1 SMAZALOVÁ Eva 1 HRUŠKA Matěj
Institution:
1 University of West Bohemia in Plzeň, New Technology Research Centre, Pilsen, Czech Republic, EU
Conference:
24th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, June 3rd - 5th 2015
Proceedings:
Proceedings 24th International Conference on Metallurgy and Materials
Pages:
947-952
ISBN:
978-80-87294-58-1
ISSN:
2694-9296
Published:
12th January 2015
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
62 views / 12 downloads
Abstract

The technology of Laser Surface Re-melting (LSR) is used to modify the surface layer of bulk materials or coatings in order to improve their surface properties, usually wear resistance. In the case of thermally sprayed coating, its application leads to elimination of porosity and internal oxides on the coating splat boundaries. The increase of corrosion resistance and inner cohesion strength of the coating is expected as a result of laser post-treatment. In the paper, the Co-Cr-W HVOF sprayed coating was subjected to the series of LSR procedures with varying laser parameters to study their influence on the thickness of remelted layer. The laser power and processing speed was the main studied parameters. The optimal parameters for LSR of coating with given thickness were found. Besides the laser parameters, the influence of spraying procedure, namely the procedure of grit blasting, on the creation of cavities in the remelted coating is discussed.

Keywords: Co-Cr-W, Stellite 6, coating, HVOF, laser surface remelting

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