Crystallographic structure of vanadium carbide precipitates in a model Fe-C-V steel
Résumé
The crystallographic structure of vanadium carbide precipitates in iron is investigated using High Resolution Transmission Electron Microscopy (HRTEM) and conventional Selected Area Diffraction (SAD) analysis. After a two steps precipitation treatment (10 hours at 700°C and 10 days at 800°C) and different annealing treatments (from 870°C to 920°C) performed on an ultra-pure Fe-V-C model alloy, carbides exhibit unambiguously the ordered monoclinic form V6C5. The often reported V4C3 structure, that refers to the pioneer work by Baker and Nutting [R. G. Baker and J. Nutting, Precipitation processes in steels (1959)] is not encountered in the present investigation. Reasons for this contradiction will be discussed, and the conclusion is drawn that no literature data is available to unambiguously support the existence of precipitates with the V4C3 structure.
Domaines
Matériaux
Origine : Fichiers produits par l'(les) auteur(s)
Loading...