Shot-Peening of Pre-Oxidized Plates of Zirconium: Influence of Residual Stress on OxidationReportar como inadecuado

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1 LICB - Laboratoire Interdisciplinaire Carnot de Bourgogne 2 LASMIS, Universite- de Technologie de Troyes LASMIS - LASMIS, Université de Technologie de Troyes

Abstract : The present study deals with oxidation behavior under residual stress of shot-peened plates of -commercially pure- zirconium exposed for 30 min at 650 C. The influence of the shot-peening on a pre-oxidized material is presented. The results have been used to determine the influences of these chemical preoxidation and mechanical shot-peening treatments on the high temperature oxidation of zirconium. The oxygen profile was revealed using micro-hardness techniques and confirmed by SEM-EDS techniques. After pre-oxidation the samples were first resurfaced then shot-peened in order to introduce residual stress. A significant increase of the hardness of about 400 HV was observed on pre-oxidized shot-peened samples. Thermogravimetric analysis for 30 min at 650 C under 200 mbar O2 showed a significantly slower oxidation rate for shot-peened samples. A comparison with our computations points out the role of the residual stresses on the diffusion and, consequently, on the oxidation.

Keywords : Shot-peening Zirconium Oxidation Stress-diffusion coupling

Autor: Laura Raceanu - Virgil Optasanu - Tony Montesin - Guillaume Montay - Manuel Francois -



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