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Proceedings Paper

A review of the physics and technological issues of high intensity laser shock processing of materials as a method for mechanical properties modification
Author(s): J. L. Ocaña; M. Morales; C. Molpeceres; J. A. Porro
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Paper Abstract

Following its first developments in the 1970's, and profiting by the increasing availability of laser sources delivering intensities above 109 W/cm2 with pulse energies in the range of several Joules and pulse widths in the range of nanoseconds, laser shock processing (LSP) is being consolidating as an effective technology for the improvement of surface mechanical and corrosion resistance properties of metals and is being developed as a practical process amenable to production engineering. The main acknowledged advantage of the laser shock processing technique consists on its capability of inducing a 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. Although significant work from the experimental side has been contributed by several authors to explore the optimum conditions of application of the treatments and to assess their ultimate capability to provide enhanced mechanical behaviour to work-pieces of typical materials, only limited attempts have been developed, however, in the way of full comprehension and predictive assessment of the characteristic physical processes and material transformations with a specific consideration of real material properties. In the present paper, a review on the physical issues dominating the development of LSP processes from a high intensity laser-matter interaction point of view is presented along with the theoretical and computational methods developed by the authors for their predictive assessment, and practical results at laboratory scale on the application of the technique to different materials are shown along with corresponding results on the mechanical properties improvement induced by LSP treatments.

Paper Details

Date Published: 8 May 2007
PDF: 11 pages
Proc. SPIE 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 63461P (8 May 2007); doi: 10.1117/12.738836
Show Author Affiliations
J. L. Ocaña, Univ. Politécnica de Madrid (Spain)
M. Morales, Univ. Politécnica de Madrid (Spain)
C. Molpeceres, Univ. Politécnica de Madrid (Spain)
J. A. Porro, Univ. Politécnica de Madrid (Spain)

Published in SPIE Proceedings Vol. 6346:
XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Dieter Schuöcker, Editor(s)

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