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Proceedings Paper

Optical and contact non-destructive measurement of the laser re-melting layers
Author(s): Hana Chmelíčková; Hana Lapšanská; Helena Hiklová; Martina Havelková; Rostislav Medlín; Petr Beneš
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Paper Abstract

Laser beam of the infrared pulsed Nd:YAG laser was used to re-melting PVD coatings on the steel substrates. Chemical composition of these layers contains carbide Cr3C2 with alloy NiCr or nitrides TiN, TiAlN, TiAlSiN and CrAlSiN. First coatings were prepared by method of high velocity oxygen fuel (HVOF) that protects the machine component surfaces from abrasion, corrosion or ensures thermal isolation, nitrides by PVD (Physical Vapor Deposition). Processing parameters such as pulse energy, pulse length and frequency were optimized in many experiments to achieve the sufficient surface energy density to melting without vaporization of the material. Multimode beam diameters about some millimetres were computed and adjusted in the suitable distance from focus plane. High laser power re-melting decreases their porosity, increases adhesion to basic material. In case of high laser energy gas vapours escape from basic material and cause fissures, re-melted surfaces have to be carefully controlled. New approach to evaluation of the quality surface structure was realized by laser confocal microscopy. Direct measuring or 3D surface model is possible with resolution less than hundred nanometres, depressions along laser beam path or rises on the laser spot edges were determined. Particles and grains with dimensions about one micron in re-melting structures can be observed better then by optical microscopy. Parallel measurements of the surface roughness were realized by the contact inductive profilometer Talysurf, collected data were displayed by software tool Talymap in a plane or spatial pictures.

Paper Details

Date Published: 18 June 2007
PDF: 8 pages
Proc. SPIE 6616, Optical Measurement Systems for Industrial Inspection V, 661640 (18 June 2007); doi: 10.1117/12.725973
Show Author Affiliations
Hana Chmelíčková, Joint Lab. of Optics of Palcký Univ. and Intitute of Physics (Czech Republic)
Hana Lapšanská, Joint Lab. of Optics of Palcký Univ. and Intitute of Physics (Czech Republic)
Helena Hiklová, Joint Lab. of Optics of Palcký Univ. and Intitute of Physics (Czech Republic)
Martina Havelková, Joint Lab. of Optics of Palcký Univ. and Intitute of Physics (Czech Republic)
Rostislav Medlín, Univ. of West Bohemia (Czech Republic)
Petr Beneš, Univ. of West Bohemia (Czech Republic)


Published in SPIE Proceedings Vol. 6616:
Optical Measurement Systems for Industrial Inspection V
Wolfgang Osten; Christophe Gorecki; Erik L. Novak, Editor(s)

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