High temperature oxidation resistance and microstructure of laser-shock peened Ti-Beta-21S

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TitreHigh temperature oxidation resistance and microstructure of laser-shock peened Ti-Beta-21S
Type de publicationJournal Article
Year of Publication2020
AuteursLavisse L., Kanjer A., Berger P., Optasanu V, Gorny C., Peyre P., Montesin T., de Lucas M.CMarco
JournalSURFACE & COATINGS TECHNOLOGY
Volume403
Pagination126368
Date PublishedDEC 15
Type of ArticleArticle
ISSN0257-8972
Mots-clésHigh temperature oxidation, Mechanical surface treatments, Metastable beta-titanium, Oxidation kinetics, Oxygen diffusion
Résumé

Improving the high temperature (HT) resistance of titanium alloys is currently a technological challenge for extending their use in aerospace engines. Ti-Beta-21S is a metastable 13 titanium alloy specifically designed for high temperature applications up to 593 degrees C. We report the effect of a surface treatment by laser-shock peening (LSP) on the high temperature behavior of Ti-Beta-21S in order to increase further its maximum service temperature. The oxidation kinetics at 700 degrees C for duration up to 3000 h showed that the LSP treatment increases the oxidation resistance of Ti-Beta-21S. The effects of the LSP treatment on the alloy microstructure, its evolution at high temperature and the diffusion of light atmospheric elements (oxygen and nitrogen) are also reported.
DOI10.1016/j.surfcoat.2020.126368