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Proceedings Paper

Modifications of mechanical and electrochemical properties of stainless steel surfaces by laser shock processing
Author(s): Xavier Scherpereel; Patrice Peyre; Remy Fabbro; Glenn Lederer; N. Celati
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Paper Abstract

Laser Shock Processing (LSP) consists on focusing a high energy pulsed laser beam on metals to create shock waves and thereby, generate compressive stresses. These stress are similar to those of conventional mechanical treatments like short peening. Nevertheless, at LSP the affected depths are greater and the surfaces keep their roughness and hardness. The present study compare the effects of LSP on the surface mechanical properties of two stainless steels: an austenitic (AISI 316L) and a martensitic (Z12 CNDV 12.02). The surface effects are characterized in terms of microstructure, hardening and residual stress levels (measured by X-ray diffraction technique). The effects of LSP on the pitting corrosion resistance of the martensitic stainless steel in a NaCl 0.01 M + Na2SO4 0.01 M solution are presented. Electrochemical tests were carried out by using open circuit and polarization techniques, to determine electrochemical parameters (free and pitting potentials, passive current densities). Laser-induced work-hardening effects were shown to be more important in the case of 316 L for which they strongly depend on the impacts repetition and the laser power density. Significant modifications on localized corrosion properties were noticed for each treatment condition (8 GW/cm2 - 20 ns pulses and 40 GW/cm2 - 2,3 ns pulses) i.e. pitting potentials were not modified but free potentials were shifted to anodic values and passive current densities reduced.

Paper Details

Date Published: 18 August 1997
PDF: 12 pages
Proc. SPIE 3097, Lasers in Material Processing, (18 August 1997); doi: 10.1117/12.281115
Show Author Affiliations
Xavier Scherpereel, Lab. d'Application des Lasers de Puissance (France)
Patrice Peyre, Lab. d'Application des Lasers de Puissance (France)
Remy Fabbro, Lab. d'Application des Lasers de Puissance (France)
Glenn Lederer, Ctr. de Recherches et d'Etudes d'Arcueil (France)
N. Celati, Ctr. de Recherches et d'Etudes d'Arcueil (France)

Published in SPIE Proceedings Vol. 3097:
Lasers in Material Processing
Leo H. J. F. Beckmann, Editor(s)

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