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Proceedings Paper

Laser cladding of CO-based protective coatings on Cr-steel
Author(s): Rafal Jendrzejewski; Gerard Sliwinski; Ana Conde; Juan J. de Damborenea
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Paper 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.

Paper Details

Date Published: 4 November 2003
PDF: 5 pages
Proc. SPIE 5226, 12th International School on Quantum Electronics: Laser Physics and Applications, (4 November 2003); doi: 10.1117/12.519519
Show Author Affiliations
Rafal Jendrzejewski, Institute of Fluid-Flow Machinery (Poland)
Gerard Sliwinski, Institute of Fluid-Flow Machinery (Poland)
Ana Conde, National Ctr. for Metallurgical Research (Spain)
Juan J. de Damborenea, National Ctr. for Metallurgical Research (Spain)

Published in SPIE Proceedings Vol. 5226:
12th International School on Quantum Electronics: Laser Physics and Applications
Peter A. Atanasov; Alexander A. Serafetinides; Ivan N. Kolev, Editor(s)

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