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

Trdan, Uros; Porro González, Juan Antonio; Ocaña Moreno, José Luis y 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.

Descripción

Título: Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy
Autor/es:
  • Trdan, Uros
  • Porro González, Juan Antonio
  • Ocaña Moreno, José Luis
  • Grum, Janez
Tipo de Documento: Artículo
Título de Revista/Publicación: Surface and Coatings Technology
Fecha: Septiembre 2012
Volumen: 208
Materias:
Palabras Clave Informales: Laser shock peening without coating (LSPwC); Aluminium alloy 6082-T651; 3D topography; Micro-hardness; Response surface methodology (RSM); Residual stress
Escuela: E.T.S.I. Industriales (UPM)
Departamento: Física Aplicada a la Ingeniería Industrial [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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.

Más información

ID de Registro: 16850
Identificador DC: http://oa.upm.es/16850/
Identificador OAI: oai:oa.upm.es:16850
Identificador DOI: 10.1016/j.surfcoat.2012.08.048
URL Oficial: http://www.sciencedirect.com/science/article/pii/S0257897212008237
Depositado por: Memoria Investigacion
Depositado el: 22 Ene 2014 19:10
Ultima Modificación: 03 Mar 2017 16:45
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