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

L. Lavisse (1) , A. Kanjer (1) , P. Berger (2) , V. Optasanu (1) , Cyril Gorny (3) , Patrice Peyre (3) , T. Montesin (1) , M.C. Marco de Lucas (1)

1 ICB - Laboratoire Interdisciplinaire Carnot de Bourgogne
2 LEEL - UMR 3685 - Laboratoire d'Etudes des Eléments Légers
3 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux

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 $\beta$ titanium alloy specifically designed for high temperature applications up to 593 °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 °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.

Mots clés: Mechanical surface treatments; Metastable beta-titanium; High temperature oxidation; Oxidation kinetics; Oxygen diffusion; metastable beta-titanium; high temperature oxidation; oxidation kinetics; oxygen diffusion

Domaines: Matériaux

L. Lavisse, A. Kanjer, P. Berger, V. Optasanu, Cyril Gorny, et al.. High temperature oxidation resistance and microstructure of laser-shock peened Ti-Beta-21S. Surface and Coatings Technology, 2020, 403, pp.126368. ⟨10.1016/j.surfcoat.2020.126368⟩. ⟨cea-02933755⟩