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Faculty of Mechanical Engineering, Lj. (FSLJ)
  • Generation of residual stresses and improvement of surface integrity characteristics by laser shock processing
    Trdan, Uroš ; Grum, Janez, 1946- ; Hill, Michael R.
    The influence of different parameters of laser shock processing applied to a precipitationhardened aluminium alloy 6082-T651, on residual stress, surface tophraphy and microhardness was investigated. ... Processing was performed with an innovative Nd:YLF laser with the power densities of 2 and 4 GW/cm2, with a uniform pulse duration of 18 ns. Laser shock processing experiments were performed with the closed ablation method to ensure a higher shock-wave pressure. In the first phase, the study was focused on an evaluation of surface topography, with the record of the surface roughness profile and with the surface evaluation at a scanning electron microscope JEOL JXA- 8600M. Then followed measurement of microhardness HV0.2 in the cross section region. In the second phase comparison of residual stresses which were measured using the X-ray diffraction, was performed. Laser shock processing turned out to be a very efficient technique to improve surface properties. On the basis of the micro plastic deformation induced by shock waves, an increased dislocation density in the specimen surface was obtained. The gradient of dislocation piling through the specimen depth improved the variation of microhardness and residual stresses, which, in turn, improves fatigue strength of the material under dynamic loading.
    Source: Residual Stresses VIII : Selected, peer reviewed papers from the 8th European Conference on Residual Stresses, ECRS8, Riva del Garda, Italy 26-28 June 2010 (Vol. 681, Mar. 2011, str. 480-485)
    Type of material - conference contribution ; adult, serious
    Publish date - 2011
    Language - english
    COBISS.SI-ID - 11776795

    Link(s):

    https://www.scientific.net/MSF.681.480
    DOI

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