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Annealing study of thin chromium layers on cemented steel substrates

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2013
auteur(s) Benarioua Younes; Boubaaya Rabeh; Lesage Jacky; Chicot Didier
journal (abréviation) Surface and Coatings Technology (Surf Coating Tech)
volume (numéro) 227
pages 65 – 69
résumé The present study has been conducted in the objective of obtaining chromium carbide layers using a conversion treatment involving three main steps: 1) carburizing treatment in order to increase the amount of carbon atoms at the steel surface, 2) deposition of a pure chromium thin layer using electrolytic method and finally, 3) annealing treatment used for carbon diffusion and carbide formation until complete transformation of chromium layer. Depending on the treatment temperature, partial or complete conversion is obtained as a result of the diffusion process. The role of the annealing temperature on transformation rates of chromium into chromium carbide films was investigated. It is shown that for 1 h of treatment the layer is totally transformed at 1100 °C. Hardness and adhesion of layers produced where found to increase whatever the annealing treatment even for partial transformation at the lower annealing temperatures.
mots clés Chromium; Chromium carbide; Steel; Diffusion; Coating
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