During laser shock peening, the pulsed laser with high energy is irradiated on the surface of the absorbing coating, after which the laser induces a plasma explosion. The plasma explosion could induce a shock wave with high peak pressure much higher than the yield strength of metal samples so that the plastic deformation can be formed after laser shock peening. After laser shock peening on metal materials, the shock wave could form compressive residual stress near the surface of the sample, which is beneficial for the mechanical properties. The hardness tester is used to measure the hardness of the sample with and without laser shock peening. The results of hardness could be used to analyze the effect of absorbing coating on shock wave. The study of laser shock peening with different absorbing coatings, such as black tape, aluminum tape, and paint coating, could help the application of laser shock peening for metal parts with complex shapes.
Laser shock peening is an effective surface technology for improving the surface mechanical properties of metals. Many studies have been performed to process different kinds of metallic material that can induce compressive residual stress in the top layer of samples, which would extend the fatigue life of metal parts in the industry. The titanium alloy samples are treated by laser shock peening with water layer as constraint layer and without protective coating in this research, after which the titanium alloy samples are observed and analyzed with a scanning electron microscope, hardness tester, laser confocal microscope, and wear tester. The surface roughness, surface microstructure, and other properties of untreated and treated titanium alloy are compared to study the effect on titanium alloy of laser shock peening process without protective coating.
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