Experimental investigations of the laser cladding of protective coatings on preheated base material
2004
Jendrzejewski, R. | Sliwinski, G. | Conde del Campo, Ana | Navas, Carmen | Damborenea, Juan de | Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
The laser cladding technique was applied to obtain Co-based stellite SF6 coatings on the chromium steel base. The coatings were prepared by means of a direct cladding of metal powder using a 1.2 kW cw CO2 laser stand with a controlled preheating of the substrate material. Results of the metallographic tests revealed a fine-grained, dendritic microstructure and proper metallic bonding between substrate and coating. A nearly constant concentration of mian elements at different areas of the coating cross-section indicated on homogeneous chemical composition of the laser-cladded SF6 alloy samples. A significant decrease of the micro-crack number with increasing temperature of the base preheating was observed. This was accompanied by a drop of the wear and corrosion resistance.
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