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Coatings of stellite SF6 are prepared on the chromium steel base by means of a direct laser cladding. A 1.2 kW CO2 laser is applied and the original material is delivered into the processing zone coaxially with the laser beam. The samples are produced with and without a controlled preheating of the substrate and are investigated by means of metallographic techniques. It is found that the observed micro-cracking susceptibility decreases markedly with increase of the base preheating temperature up to 750 K and the crack-free coatings are produced for preheating around 950 K. The substrate-coating interface reveals a metallic bond and the microstructure is characterized by a fine-grained, dendritic structure. The nearly constant concentration dependence of Fe, Co, Cr and Ni on the distance from interface indicates on homogeneous chemical composition of the produced coatings.
Rafal Jendrzejewski,Gerard Sliwinski,Ana Conde, andJuan J. de Damborenea
"Influence of the base preheating on cracking of the laser-cladded coatings", Proc. SPIE 5121, Laser Processing of Advanced Materials and Laser Microtechnologies, (2 September 2003); https://doi.org/10.1117/12.515624
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Rafal Jendrzejewski, Gerard Sliwinski, Ana Conde, Juan J. de Damborenea, "Influence of the base preheating on cracking of the laser-cladded coatings," Proc. SPIE 5121, Laser Processing of Advanced Materials and Laser Microtechnologies, (2 September 2003); https://doi.org/10.1117/12.515624