Effect of laser shock peening on the high temperature oxidation resistance of titanium

SURFACE & COATINGS TECHNOLOGY

卷:326

Article

Kanjer, A.¹  Lavisse, L.¹  Optasanu, V.¹  Berger, P.²  Gorny, C.³  Peyre, P.³  Herbst, F.¹  Heintz, O.¹  Geoffroy, N.¹  Montesin, T.¹  de Lucas, M. C. Marco¹ 

[1] Univ Bourgogne Franche Comte, CNRS, Lab Interdisciplinaire Carnot Bourgogne ICB, UMR 6303, 9 Av A Savary,BP 47 870, F-21078 Dijon, France

[2] Univ Paris Saclay, CNRS, CEA, CEA Saclay,NIMBE, F-91191 Gif Sur Yvette, France

[3] Arts & Metiers ParisTech, CNRS, UMR 8006, PIMM Lab, 151 Bd Hop, F-75013 Paris, France

关键词: Titanium;    Laser shock peening;    High temperature oxidation;    Surface analysis;    Nitrogen insertion;   

DOI  :  10.1016/j.surfcoat.2017.07.042

来源: Elsevier

【 摘 要 】

The effect of laser shock peening on the high temperature, oxidation resistance of commercial pure titanium at high temperature (700 degrees C) was studied in long-time (3000 h) exposure under dry air. A reduction of the gain mass by a factor 4 was found for laser-shock peened (LSP) samples compared to untreated titanium, which supports the interest of laser-shock treatment for the improvement of high temperature resistance. Short-durations (10 h and 100 h) oxidation experiments, devoted to investigate the influence of the LSP treatment on the first stages of the oxidation process, were also carried out by TGA. Several techniques as scanning electron microscopy, hardness and roughness measurements, X-ray diffraction and X-ray photoelectron spectrometry, micro Raman spectroscopy, nuclear reaction analysis and electron backscattered diffraction were used to characterize the-sample after laser treatment and oxidations. The formation of a continuous nitrogen-rich layer between the oxide layer and the a-case area in LSP samples appears to be the key factor to explain the reduction of oxygen diffusion, and thus the improvement of the oxidation resistance of laser shocked titanium. Moreover, the grain texture of LSP samples after oxidation can also explain the improvement of the high temperature oxidation resistance after long times exposures. (C) 2017 Elsevier B.V. All rights reserved.

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