Effect of laser shock peening power density on peak pressure, pulse profile and residual stresses in titanium alloy specimens

The effect of laser shock peening power density on shock wave pressure and residual stress level was investigated. Pressure pulse shapes at the same power density were compared for titanium alloys for the purpose of subsequent mathematical modeling of the laser shock peening process. Analysis of the study results for several materials showed that at a certain power density, the residual stress level reaches an asymptote and then remains virtually unchanged. Moreover, depending on the alloy type, not only the slope of the curve but also the power density at which the residual stress reaches an asymptote after one laser pass changes. With an increase in the number of laser passes, the level and depth of residual stress increase linearly — up to 10…15 and 30%, respectively. After one laser pass, the maximum residual stress value for most materials is in the range of (–0.5…0.7)σ_0.2, and after two passes, in the range of (–0.5…0.8)σ_в. Moreover, laser impact treatment of certain metals, in particular aluminum alloys, leads to the creation of residual stress equal to –0.9σ_0.2 and more with two passes or more.
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