Authors
Laura Raceanu, Virgil Optasanu, Tony Montesin, Guillaume Montay, Manuel François,
Title
Shot-peening of pre-oxidized plates of zirconium: Influence of residual stress on oxidation
In
Oxidation of Metals
Volume
79
Issue
1-2
Pages
135–145
Publisher
Springer
Year
2013
Indexed by
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 (pre-oxidation) 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.
Affiliations
Offprint