0000000000177712

AUTHOR

P.-y. Thro

showing 2 related works from this author

Renforcement de la résistance à la corrosion localisée de l’acier inoxydable 304L grâce au traitement de surface par laser impulsionnel

2013

L’acier inoxydable 304L est utilise dans de nombreux domaines. Cependant, il peut, dans certaines conditions, etre sensible a la corrosion par piquration. Dans cette etude, nous nous sommes interesses aux potentialites du traitement de fusion superficielle par laser nanopulse pour l’amelioration de la resistance a la corrosion de cet acier. Ce traitement consiste a focaliser un faisceau laser sur la surface du materiau, provoquant sa fusion quasi instantanee sur quelques microns, immediatement suivie d’un refroidissement ultra-rapide allant jusqu’a 1011 K/s. Les parametres laser impliquent des modifications des proprietes physico-chimiques. Nous avons notamment etudie l’influence du recouvr…

Pulsed laserLaser surface meltingMaterials scienceMaterials ChemistryMetals and AlloysIron alloysPitting corrosionPhysical and Theoretical ChemistryCondensed Matter PhysicsMolecular biologyRevue de Métallurgie
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Laser ablation of a turbid medium : Modeling and experimental results.

2006

International audience; Q -switched Nd:YAG laser ablation of a turbid medium (paint) is studied. The optical properties (absorption coefficient, scattering coefficient, and its anisotropy) of a paint are determined with a multiple scattering model (three-flux model), and from measurements of reflection-transmission of light through thin layers. The energy deposition profiles are calculated at wavelengths of 532 nm and 1.064 $\mu$m. They are different from those described by a Lambert-Beer law. In particular, the energy deposition of the laser beam is not maximum on the surface but at some depth inside the medium. The ablated rate was measured for the two wavelengths and compared with the en…

Materials scienceInteraction laser-matiere / Ablation de peinture/ modelisationPhysics::Medical PhysicsGeneral Physics and AstronomyPhysics::Optics02 engineering and technology[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciencesLight scatteringlaw.invention010309 opticsOpticslaw0103 physical sciencesThin filmAbsorption (electromagnetic radiation)Laser ablationbusiness.industryScattering[INFO.INFO-NA]Computer Science [cs]/Numerical Analysis [cs.NA]021001 nanoscience & nanotechnologyLaserQ-switchingAttenuation coefficient0210 nano-technologybusiness
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