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

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 the...

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Bibliographic Details
Published in:arXiv.org 2013-01
Main Authors: Raceanu, Laura, Optasanu, Virgil, Montesin, Tony, Montay, Guillaume, Francois, Manuel
Format: Article
Language:English
Subjects:
High temperature
Microhardness
Organic chemistry
Oxidation
Oxidation rate
Residual stress
Shot peening
Thermogravimetric analysis
Zirconium
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1301.1635