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Proceedings Paper

Induction of engineered residual stresses fields and enhancement of fatigue life of high reliability metallic components by laser shock processing
Author(s): J. L. Ocaña; J. A. Porro; M. Díaz; L. Ruiz de Lara; C. Correa; A. Gil-Santos; D. Peral
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Paper Abstract

Laser shock processing (LSP) is being increasingly applied as an effective technology for the improvement of metallic materials mechanical and surface properties in different types of components as a means of enhancement of their corrosion and fatigue life behavior. As reported in previous contributions by the authors, a main effect resulting from the application of the LSP technique consists on the generation of relatively deep compression residual stresses field into metallic alloy pieces allowing an improved mechanical behaviour, explicitly the life improvement of the treated specimens against wear, crack growth and stress corrosion cracking. Additional results accomplished by the authors in the line of practical development of the LSP technique at an experimental level (aiming its integral assessment from an interrelated theoretical and experimental point of view) are presented in this paper. Concretely, follow-on experimental results on the residual stress profiles and associated surface properties modification successfully reached in typical materials (especially Al and Ti alloys characteristic of high reliability components in the aerospace, nuclear and biomedical sectors) under different LSP irradiation conditions are presented along with a practical correlated analysis on the protective character of the residual stress profiles obtained under different irradiation strategies. Additional remarks on the improved character of the LSP technique over the traditional “shot peening” technique in what concerns depth of induced compressive residual stresses fields are also made through the paper.

Paper Details

Date Published: 26 February 2013
PDF: 8 pages
Proc. SPIE 8603, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications II, 86030D (26 February 2013); doi: 10.1117/12.2003935
Show Author Affiliations
J. L. Ocaña, Univ. Politécnica de Madrid (Spain)
J. A. Porro, Univ. Politécnica de Madrid (Spain)
M. Díaz, Univ. Politécnica de Madrid (Spain)
L. Ruiz de Lara, Univ. Politécnica de Madrid (Spain)
C. Correa, Univ. Politécnica de Madrid (Spain)
A. Gil-Santos, Univ. Politécnica de Madrid (Spain)
D. Peral, Univ. Politécnica de Madrid (Spain)

Published in SPIE Proceedings Vol. 8603:
High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications II
Friedhelm Dorsch, Editor(s)

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