THE INFLUENCE OF PROCESSING PARAMETERS ON THE MICROSTRUCTURE OF WC-NICRBSI LASER CLAD COATINGS

1 HOUDKOVÁ Šárka
Co-authors:
1 VOSTŘÁK Marek 1 ČESÁNEK Zdeněk
Institution:
1 University of West Bohemia in Plzeň, New Technology Research Centre, Plzeň, Czech Republic, EU
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
963-968
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
97 views / 34 downloads
Abstract

Laser cladding is a progressive technology enabling to deposit coatings in thickness higher than 1 mm. In comparison with the conventional overwelds it offers the advantage of thinner heat-affected zone in the substrate material and lower and better controlled inner residual stress and related deformation. Compare to thermal sprayed coatings, it provides the metallurgical bonding to the substrate and fully dense coating microstructure with zero porosity, enabling the full corrosion protection of substrate. The range of materials deposited by laser cladding is limited to metals and its alloy due to the principle of technology, requiring the simultaneous melting of substrate surface layer and added coating materials. To improve the wear resistance, the hard particles such as carbides are added to the feedstock powder. During deposition process, the kinetics of melting and solidification of both metal and carbide particles are controlled by used technological parameters of laser. In the paper, the influence of deposition parameters on the geometrical characteristics and microstructure of WC-NiCrBSi laser clad coating is presented with attention paid namely to the hard particles decomposition and its influence on the measured hardness.

Keywords: WC-NiCrBSi, laser clad, dilution, laser beam scanning speed, carbide dissolution

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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