Laser cladding of CO-based protective coatings on Cr-steel

Rafal Jendrzejewski; Gerard Sliwinski; Ana Conde; Juan J. de Damborenea

doi:10.1117/12.519519

4 November 2003 Laser cladding of Co-based protective coatings on Cr-steel

Rafal Jendrzejewski, Gerard Sliwinski, Ana Conde, Juan J. de Damborenea

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.

Citation Download Citation

Rafal Jendrzejewski, Gerard Sliwinski, Ana Conde, and 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); https://doi.org/10.1117/12.519519

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