Laser Shot Peening to Improve Surface Properties of Precipitation Hardened Aluminum Alloy Al-6061-T6

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Laser shot peening is increasingly used as one of the better alternative methods to improve the surface properties of structural components and for the in-suit preventive maintenance of nuclear reactor componets. This paper attempts to investigate the effect of laser peening with a low energy laser (300 mJ, 1064 nm, 10 ns) on precipitation hardened aluminum alloy Al-6061-T6 with and without sacrifi cial coating on the target surface. The laser peened and unpeened surfaces were characterized using XRD based surface residual stress measurement, SEM, AFM based roughness analysis and micro hardness measurements. The study concluded that low energy laser is enough to impart compressive residual stress on the surface. Micro hardness study conformed the hardening of laser peened surfaces and depth profi le study indicate the presence of strain hardened layer up to 0.7 mm from the top surface.

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  • レーザー研究

    レーザー研究 42 (6), 494-, 2014

    一般社団法人 レーザー学会

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