Abstract. The present study deals with the 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 preoxidizedmaterial 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. The thermogravimetric analysis for 30 min at 650°C under 200mbar O 2 shows 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.
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