Influence Of Thermal And Mechanical Laser Surface Treatments On The Pitting Corrosion Resistance Of AISI 316L Steel.
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P. Peyre, C. Carboni, G. Beranger & C. Lemaitre
Influence of thermal and mechanical laser surface treatments on the pitting corrosion resistance of AISI 316L steel t P.Peyre, * C.Carboni, ^ G.Beranger & ^ C.Lemaitre Abstract Laser-shock peening (LSP) and laser surface melting (LSM) have been carried out on 316L steel using pulsed YAG and continuous wave (cw) diode lasers, with objective to modify the localised corrosion properties in NaCl 0.05 M saline environment. LSP at 7-20 10^ W/cnf generates a pure plastic deformation microstructure with deformation bands, compressive residual stresses and a work-hardening of the surface, without chemical modifications or phase transformations. After LSM at 2.5.10^ W/cnf, the surface is refined and undergoes 10 % 5 ferrite transformation during cooling, with microsegregation of Cr and Ni between dendrite cores and dendrite arm spacing (DAS). More, after LSM, most of the surface inclusions (Ca, Si, Al, Mn aggregates) are remelted. Both treatments drive to enhanced corrosion pr