Abstract
Laser peening is an emerging surface technology to prevent stress corrosion cracking (SCC) and enhance fatigue properties by imparting compressive residual stress. The authors confirmed the residual stress state in the laser-irradiated top surface with specially developed X-ray diffraction technique controlling the X-ray penetration depth constant during a series of exposures with different Ψ angles. The results showed that the residual stress in the top surface after laser peening was compressive. The absolute value was somewhat decreased by thermal loading, however, the overall distribution was still stable up to 673K for SUS304.
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