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Apport de la diffraction des rayons X à l`étude d`un acier faiblement allié nitruré ioniquement par plasma

type de publication      article dans une revue nationale avec comité de lecture
date de publication 1995
auteur(s) Chicot Didier; Bartier O.; Zampronio M.A.; De Miranda P.E.V.; Lesage Jacky
journal (abréviation) Matériaux et Techniques (M&T)
volume (numéro) 1-2
  
pages 45 – 49
résumé The present work deals with the use of X-ray diffraction to complete the metallographic study of plasma ion nitrided loaw alloyed steel. This method allows to determine and quantify the nature and repartition of constituants present after three times of treatment (1/2h, 16h, 28h). Microdeformations as well as coherent domain sizes linked to dislocation network are also determined using this method. We show that the formation of the combination layer delays the nitriding process playing the role of a diffusion barrier between the bulk material and the nitriding medium. For the larger nitriding time, the combination layer, at first only constitued of gamma prime nitride, is transformed partly in epsilon nitride. This transformation is accompagned simultaneously by the formation of pores into the combination layer. The microhardness profile of the diffsuion layer do not follow the nitride content profile, then the hardness increase has to be linked to the dislocation density and arrangement
mots clés Nitriding, Layer, X-ray diffraction, Microdeformation
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