Laser peening without coating (LPwC) has been applied to water-immersed materials using a water-penetrable light of a Q-switched and frequency-doubled Nd:YAG laser. Compressive residual stress of several hundred MPa was introduced at the surface of the materials. High-cycle fatigue (HCF) properties were evaluated through rotating-bending or push-pull type testing for an austenitic stainless steel (SUS316L), a titanium alloy (Ti-6Al-4V) and a cast aluminum alloy (AC4CH). LPwC prolonged the fatigue lives significantly, in spite of the increase in surface roughness ascribed to the ablative interaction of laser pulses with the materials.

Volume Subject Area:
Operations, Applications, and Components
Topics:
Coating processes, Coatings, Laser hardening, Surface properties, High cycle fatigue, Water, Aluminum casting alloys, Fatigue, Lasers, Nd-YAG lasers, Q-switching, Stainless steel, Stress, Surface roughness, Testing, Titanium alloys
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Copyright © 2006
 by ASME
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