Optical and contact non-destructive measurement of the laser re-melting layers

Hana Chmelíčková; Hana Lapšanská; Helena Hiklová; Martina Havelková; Rostislav Medlín; Petr Beneš

doi:10.1117/12.725973

18 June 2007 Optical and contact nondestructive measurement of the laser remelting layers

Hana Chmelíčková, Hana Lapšanská, Helena Hiklová, Martina Havelková, Rostislav Medlín, Petr Beneš

Proceedings Volume 6616, Optical Measurement Systems for Industrial Inspection V; 661640 (2007) https://doi.org/10.1117/12.725973
Event: Optical Metrology, 2007, Munich, Germany

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.

Citation Download Citation

Hana Chmelíčková, Hana Lapšanská, Helena Hiklová, Martina Havelková, Rostislav Medlín, and Petr Beneš "Optical and contact nondestructive measurement of the laser remelting layers", Proc. SPIE 6616, Optical Measurement Systems for Industrial Inspection V, 661640 (18 June 2007); https://doi.org/10.1117/12.725973

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