Abstract

Tout en etudiant la possibilite de durcir la surface de l'acier 18H 2N4 WA, en utilisant la nitrification par laser, on a observe une structure annuaire sur la surface de la cible sur les 2 faces, ou la lumiere tombe. On a utilise ici un laser au verre neodyme fonctionnant en regime de generation ordinaire comme source d'impulsions lumineuses et on a observe un echantillon en acier 18H 2N4 WA ayant la forme d'un anneau. L'echantillon a ete irradie dans une chambre construite dans ce but en azote, la pression allant de 5 a 100 atm

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