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Structural characterization of laser-treated Cr3C2–NiCr coatings

Published online by Cambridge University Press:  31 January 2011

P. Serra ,
J. M. Miguel ,
J. L. Morenza  and
J. M. Guilemany
P. Serra
Affiliation:
Universitat de Barcelona, Departament de Física Aplicada i Òptica, Av. Diagonal 647, E-08028 Barcelona, Spain
J. M. Miguel
Affiliation:
Universitat de Barcelona, Departament d'Enginyeria Química i Metal.lúrgia, Av. Diagonal 647, E-08028 Barcelona, Spain
J. L. Morenza
Affiliation:
Universitat de Barcelona, Departament de Física Aplicada i Òptica, Av. Diagonal 647, E-08028 Barcelona, Spain
J. M. Guilemany
Affiliation:
Universitat de Barcelona, Departament d'Enginyeria Química i Metal.lúrgia, Av. Diagonal 647, E-08028 Barcelona, Spain
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Abstract

The interconnected porosity of the Cr3C2–NiCr coatings obtained by high-velocity oxy fuel spraying is detrimental in corrosion and wear resistance applications. Laser treatments allow sealing of their surfaces through melting and resolidification of a thin superficial layer. A Nd:YAG laser beam was used to irradiate Cr3C2–NiCr coatings either in the continuous wave mode or at different repetition rates in the pulsed one. Results indicated that high peak and low mean laser irradiances are not good, since samples presented deep grooves and an extensive crack network. At low peak and higher mean laser irradiances the surface was molten, and only a few shallow cracks were observed. The interconnected porosity was completely eliminated in a layer up to 80 μm thick, formed by large Cr7C3 grains imbedded in a NiCr matrix.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 12 , December 2001 , pp. 3416 - 3422
Copyright
Copyright © Materials Research Society 2001

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References

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