Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

SURFACE & COATINGS TECHNOLOGY

卷:208

Article

Trdan, Uros¹  Porro, Juan A.²  Ocana, Jose L.²  Grum, Janez¹ 

[1] Univ Ljubljana, Fac Mech Engn, Ljubljana 61000, Slovenia

[2] Univ Politecn Madrid, Ctr Laser UPM, E-28040 Madrid, Spain

关键词: Laser shock peening without coating (LSPwC);    Aluminium alloy 6082-T651;    3D topography;    Micro-hardness;    Response surface methodology (RSM);    Residual stress;   

DOI  :  10.1016/j.surfcoat.2012.08.048

来源: Elsevier

【 摘 要 】

The influence of nanosecond laser pulses applied by laser shock peening without absorbent coating (LSPwC) with a Q-switched Nd:YAG laser operating at a wavelength of lambda=1064 nm on 6082-T651 Al alloy has been investigated. The first portion of the present study assesses laser shock peening effect at two pulse densities on three-dimensional (3D) surface topography characteristics. In the second part of the study, the peening effect on surface texture orientation and micro-structure modification, i.e. the effect of surface craters due to plasma and shock waves, were investigated in both longitudinal (L) and transverse (T) directions of the laser-beam movement. In the final portion of the study, the changes of mechanical properties were evaluated with a residual stress profile and Vickers micro-hardness through depth variation in the near surface layer, whereas factorial design with a response surface methodology (RSM) was applied. The surface topographic and micro-structural effect of laser shock peening were characterised with optical microscopy, InfiniteFocus (R) microscopy and scanning electron microscopy (SEM). Residual stress evaluation based on a hole-drilling integral method confirmed higher compression at the near surface layer (33 mu m) in the transverse direction (sigma(min)) of laser-beam movement, i.e. -407 +/- 81 MPa and -346 +/- 124 MPa, after 900 and 2500 pulses/cm(2), respectively. Moreover, RSM analysis of micro-hardness through depth distribution confirmed an increase at both pulse densities, whereas LSPwC-generated shock waves showed the impact effect of up to 800 mu m below the surface. Furthermore, ANOVA results confirmed the insignificant influence of LSPwC treatment direction on micro-hardness distribution indicating essentially homogeneous conditions, in both L and T directions. (C) 2012 Elsevier B.V. All rights reserved.

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