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

Trdan, Uros and Porro González, Juan Antonio and Ocaña Moreno, José Luis and Grum, Janez (2012). Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy. "Surface and Coatings Technology", v. 208 ; pp. 109-116. ISSN 0257-8972. https://doi.org/10.1016/j.surfcoat.2012.08.048.

Description

Title: Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy
Author/s:
  • Trdan, Uros
  • Porro González, Juan Antonio
  • Ocaña Moreno, José Luis
  • Grum, Janez
Item Type: Article
Título de Revista/Publicación: Surface and Coatings Technology
Date: September 2012
ISSN: 0257-8972
Volume: 208
Subjects:
Freetext Keywords: Laser shock peening without coating (LSPwC); Aluminium alloy 6082-T651; 3D topography; Micro-hardness; Response surface methodology (RSM); Residual stress
Faculty: E.T.S.I. Industriales (UPM)
Department: Física Aplicada a la Ingeniería Industrial [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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 λ = 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® 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 μm) in the transverse direction (σmin) of laser-beam movement, i.e. − 407 ± 81 MPa and − 346 ± 124 MPa, after 900 and 2500 pulses/cm2, 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 μm 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.

More information

Item ID: 16850
DC Identifier: http://oa.upm.es/16850/
OAI Identifier: oai:oa.upm.es:16850
DOI: 10.1016/j.surfcoat.2012.08.048
Official URL: http://www.sciencedirect.com/science/article/pii/S0257897212008237
Deposited by: Memoria Investigacion
Deposited on: 22 Jan 2014 19:10
Last Modified: 03 Mar 2017 16:45
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