This specification covers the requirements for computer controlled laser peening of metal part surfaces to induce residual compressive stresses at and beneath the surface.Laser peening is utilized to induce compressive residual stresses at and beneath the surface of metal parts to depths of 0.040? to 0.080? (1 to 2 mm) depending on the metal properties and the laser peening processing parameters. These residual stresses can provide improved fatigue life and stress corrosion resistance, although usage is not limited to such applications.
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