Hill Engineering, LLC

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Laser peening

Laser peening is a method for developing deep compressive residual stress. The figure at right shows residual stress in Ti6Al4V (measured by slitting) as a function of depth below the surface for glass bead peening and for five variations of laser peening. The laser peening treatement variations are specified by irradiance, pulsewidth, and number of layers, reflected by the dash sequence in the legend. The large depth of residual stress obtained for high levels of irradiance (e.g., 10-18-2) provides robust resistance to stress corrosion cracking and to fatigue initiated by fretting or foreign object damage.