High Temperature Oxidation Kinetics of Shot-Peened and Laser-Shock Peened Ti-Beta-21S

Autor:	A. Kanjer, Benjamin Vincent, Tony Montesin, Virgil Optasanu, L. Lavisse, M.C. Marco de Lucas
Rok vydání:	2021
Předmět:	Materials science Diffusion Kinetics Metals and Alloys chemistry.chemical_element Peening Nitrogen Oxygen Isothermal process Shock (mechanics) Inorganic Chemistry Metal chemistry visual_art Materials Chemistry visual_art.visual_art_medium Composite material
Zdroj:	Oxidation of Metals. 96:257-270
ISSN:	1573-4889 0030-770X
Popis:	Isothermal oxidation tests of mechanically treated Ti-Beta-21S (TIMET, Ti–15Mo–3Nb–3Al–2Si, ASTM Grade 21) were performed under dry air at 650, 700 and 750 °C for 100 h and compared to untreated samples. Two different mechanical surface treatments were used: ultrasonic shot-peening (SP) and laser-shock peening (LSP). The study investigates the effect of both treatments on the oxidation kinetics of the process and the role of atmospheric nitrogen insertion. With this aim, oxidation experiments were also performed under pure oxygen. The results show that the oxidation is governed by diffusion after a short transient time. Both SP and LSP treatments improve the high temperature oxidation resistance of Ti-Beta-21S in dry air, but not in pure oxygen. The formation of a nitrogen-enriched layer at the oxide–metal interface, which is promoted by the mechanical surface treatments, explains the increase in the oxidation resistance in air by slowing down the diffusion of oxygen into the metal.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e495aa9ba2faaf6c17424ca58731fa50 https://doi.org/10.1007/s11085-021-10043-w Zobrazit plný text záznamu Full text from SpringerLink