4 November 2003 Laser cladding of Co-based protective coatings on Cr-steel
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Proceedings Volume 5226, 12th International School on Quantum Electronics: Laser Physics and Applications; (2003) https://doi.org/10.1117/12.519519
Event: 12th International School on Quantum Electronics Laser Physics and Applications, 2002, Varna, Bulgaria
Abstract
The direct laser cladding process is applied for production of the cobalt-based stellite SF6 coatings on the chromium steel substrates of a composition designed for the steam turbine blades. A cw 1.2 kW CO2 laser stand equipped with a multi-stream nozzle mounted co-axially with the focusing optics is applied. Experiments are performed for the non-preheated as well as preheated base material. Differences in microstructure, chemical composition, and in the cracking susceptibility between coatings produced on preheated (780 - 1000 K) and non-preheated substrates are analyzed by means of scanning electron microscopy (SEM) and the Energy Dispersive X-ray Spectroscopy (XEDS). Results indicate a significant improvement of the clad quality and decrease of the micro-cracking susceptibility with the increase of preheating temperature. The presence of Fe in the coatings is ascribed to migration from substrate due to preheating.
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Rafal Jendrzejewski, Rafal Jendrzejewski, Gerard Sliwinski, Gerard Sliwinski, Ana Conde, Ana Conde, Juan J. de Damborenea, Juan J. de Damborenea, } "Laser cladding of Co-based protective coatings on Cr-steel", Proc. SPIE 5226, 12th International School on Quantum Electronics: Laser Physics and Applications, (4 November 2003); doi: 10.1117/12.519519; https://doi.org/10.1117/12.519519
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