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The present study deals with oxidation behavior under residual stress ofshot-peened plates of "commercially pure" zirconium exposed for 30 min at 650C. 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 temperatureoxidation of zirconium. The oxygen profile was revealed using micro-hardnesstechniques and confirmed by SEM-EDS techniques. After pre-oxidation the sampleswere first resurfaced then shot-peened in order to introduce residual stress. Asignificant increase of the hardness of about 400 HV was observed onpre-oxidized shot-peened samples. Thermogravimetric analysis for 30 min at 650C under 200 mbar O2 showed a significantly slower oxidation rate forshot-peened samples. A comparison with our computations points out the role ofthe residual stresses on the diffusion and, consequently, on the oxidation.

Shot-Peening of Pre-Oxidized Plates of Zirconium: Influence of Residual Stress on Oxidation