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Etude des modifications structurales induites par implantation ionique dans les aciers austénitiques

Abstract : Ion implantation in steels, although largely used to improve the properties of use, involves structural modifications of the surface layer, which remain still prone to controversies. Within this context, various elements (N, Ar, Cr, Mo, Ag, Xe and Pb) were implanted (with energies varying from 28 to 280 keV) in a 316LVM austenitic stainless steel. The implanted layer has a thickness limited to 80 nm and a maximum implanted element concentration lower than 10 %at. The analysis of the implanted layer by grazing incidence X-ray diffraction highlights deformations of austenite lines, appearance of ferrite and amorphisation of the layer.
Ferritic phase which appears at the grain boundaries, whatever the implanted element, is formed above a given “threshold” of energy (produced of fluency by the energy of an ion). The formation of ferrite as well as the amorphisation of the implanted layer depends only on energy.
In order to understand the deformations of austenite diffraction lines, a simulation model of these lines was elaborated. The model correctly describes the observed deformations (broadening, shift, splitting) with the assumption that the expansion of the austenitic lattice is due to the presence of implanted element and is proportional to the element concentration through a coefficient k'. This coefficient only depends on the element and varies linearly with its radius.
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https://tel.archives-ouvertes.fr/tel-00136939
Contributor : Julien Dudognon <>
Submitted on : Saturday, March 24, 2007 - 2:25:22 PM
Last modification on : Thursday, March 5, 2020 - 6:49:16 PM
Long-term archiving on: : Tuesday, September 21, 2010 - 12:40:39 PM

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  • HAL Id : tel-00136939, version 2

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Julien Dudognon. Etude des modifications structurales induites par implantation ionique dans les aciers austénitiques. Physique [physics]. Université d'Orléans, 2006. Français. ⟨tel-00136939v2⟩

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