Publications: Articles

Resume: Discharge-surface interaction in liquids includes many phenomena which are reviewed in this work. This is used to examine results in the area of nanoparticle synthesis and to propose a general sketch of formation mechanisms.

Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS

Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS

Mots clefs: High Current Pulsed Electron Beam Treatment (HCPEB) Surface hardening Corrosion Phase selection Phase transformation Martensitic steel

Resume: Abstract The surface of the AISI 420 martensitic stainless steel was subjected to High Current Pulsed Electron Beam (HCPEB) treatment. The microstructure in the melted layer consisted of a three phase mixture: (i) fine ?-Fe grains formed via epitaxial growth from the substrate, (ii) larger ?–grains nucleated from the top surface of the melt and (iii) some needles-like variants issued from the solid state martenitic transformation. Despite this complex multi-phase microstructure, the corrosion performance, tested in a sulfuric acid solution, was significantly enhanced by the HCPEB treatment. The increase in corrosion potential and delayed pitting are essentially attributed to an increase in Cr content, rising from 13.3 wt. % in the bulk to about 14 wt. % at the surface, together with a very limited amount of surface craters. This low density of craters did not give rise to significant deep hardening in the sub-surface but the top surface melted layer hardness was increased by more than 50% because of the triggering of the martensitic transformation.

Equipe: Département CP2S : Chimie et électrochimie des matériaux

Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS

Resume: The kinetic aspects of the coating formation on the 2024 aluminium alloy at different time intervals of the microarc oxidation process(MAO) in an alkaline-silicate electrolyte under the AC current are investigated.Moreover themain reasons of modifications in theMAO coating properties (corrosion resistance,microhardness) and phase composition during the process are shown. Finally, non-destructive controlmethods ofMAO coating properties are worked out.

Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS