Effect of mechanical surface treatments on the high temperature oxidation of pure titanium: the role of nitrogen

The mechanically treated high temperature (700°C) oxidation of commercially pure titanium was studied for long exposures (3000 h). The treatments studied here are the shot-peening and the laser-shock peening. The mass gain was measured by discontinued weighing. SEM and Raman imaging revealed strong...

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Bibliographic Details
Published in:MATEC web of conferences 2020-01, Vol.321, p.12045
Main Authors: Lavisse, L., Kanjer, A., Berger, P., Peyre, P., Gorny, C., François, M., Optasanu, V., Montesin, T., de Lucas, M. C. Marco
Format: Article
Language:English
Subjects:
Analytical techniques
Chemical Sciences
Diffusion rate
High temperature
Ion beams
Laser shock processing
Lasers
Light elements
Material chemistry
Nitrogen
Oxidation
Oxygen enrichment
Scale (corrosion)
Shot peening
Titanium
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Summary:The mechanically treated high temperature (700°C) oxidation of commercially pure titanium was studied for long exposures (3000 h). The treatments studied here are the shot-peening and the laser-shock peening. The mass gain was measured by discontinued weighing. SEM and Raman imaging revealed strong differences between laser-shock peened, shot-peened and untreated oxidized samples. The laser treatment leads to thin compact and protective oxide layer while the shot-peened and untreated samples exhibit cracked oxide layers. The distribution of light elements like carbon, oxygen and nitrogen was revealed by Ion Beam Analysis. The presence of nitrogen located at the interface between the oxide scale and the metal was revealed on laser-shock peened samples. It is supposed the nitrogen slows-down the oxygen diffusion into the metal. The extent of the oxygen-enriched metal is also smaller on LSP samples, which improves the ductility of titanium.
ISSN:2261-236X
2274-7214
2261-236X
DOI:10.1051/matecconf/202032112045