Modifications of mechanical and electrochemical properties of stainless steel surfaces by laser shock processing

Xavier Scherpereel; Patrice Peyre; Remy Fabbro; Glenn Lederer; N. Celati

doi:10.1117/12.281115

18 August 1997 Modifications of mechanical and electrochemical properties of stainless steel surfaces by laser shock processing

Xavier Scherpereel, Patrice Peyre, Remy Fabbro, Glenn Lederer, N. Celati

Author Affiliations +

Proceedings Volume 3097, Lasers in Material Processing; (1997) https://doi.org/10.1117/12.281115
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

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.

Citation Download Citation

Xavier Scherpereel, Patrice Peyre, Remy Fabbro, Glenn Lederer, and N. Celati "Modifications of mechanical and electrochemical properties of stainless steel surfaces by laser shock processing", Proc. SPIE 3097, Lasers in Material Processing, (18 August 1997); https://doi.org/10.1117/12.281115

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