High temperature oxidation resistance and microstructure of laser-shock peened Ti-Beta-21S
Article dans une revue avec comité de lecture
Author
LAVISSE, LucKANJER, ArmandBERGER, P.OPTASANU, V.GORNY, Cyril 
PEYRE, PatriceMONTESIN, T.MARCO DE LUCAS, M.C.Abstract
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 β 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.
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