Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Residual Stress Fields and Associated Modification of Surface Properties in Al and Ti Alloys Induced by Q-switched, ns Pulse, Laser Shock Processing
Year:2008
Research Areas
  • Mechanical engineering,
  • Naval engineering,
  • Construction materials
Information
Abstract
After the first initial development of the LSP technique, partly precluded in its industrial development by the practical unavailability of powerful laser sources able to provide intensities exceeding the GW/cm2 level, a new intense research effort is under course aiming to develop the LSP technology as a leading industrial technology for materials surface properties improvement [1-2]. Following this path, the authors have undertaken a research program in the line of practical development of the LSP technique at an experimental level, aiming its integral assessment from an interrelated theoretical and experimental point of view. The practical irradiation system used for the experiments reported in this paper is shown in figure 1 (left). The laser source is a Q-switched, 9 ns pulse width, up to 2.5 J per pulse, 10 Hz, Nd:YAG laser source working at its fundamental wavelength (1064 nm), the work with the 2nd harmonic (532 nm) being also possible. The laser light is conducted to the interaction area with the adequate focussed intensity in order to avoid dielectric breakdown of the confining medium (water or other dielectric medium), whose purity control is a critical factor affecting the process. In the present paper, experimental results on the residual stress profiles and associated surface properties modification successfully reached in typical materials (especially Al and Ti alloys) under different LSP irradiation conditions are presented. In particular, the analysis of the residual stress profiles obtained under different irradiation strategies and the evaluation of the corresponding induced surface properties as roughness, microhardness and wear resistance will be presented. In figure 1 (right) a sample result of comparison of residual stresses fields obtained in Ti6Al4V for three representative laser pulse areal densities. The test piece geometry used for the presented analyses is always intended to allow the comparison of different laser pulse overlapping factors and, especially, the comparison of the experimental measurement results with the numerical results obtained through the numerical simulation system developed by the authors [3], a possibility remarkably important from the point of view of enabling the predictive assessment of the treatments, in turn a key requirement for the effective implementation of LSP as an industrially developed technique.
International
Si
Congress
First International Conference on Laser Peening
960
Place
Johnson Space Center NASA, Houston, Texas (EE.UU.)  
Reviewers
Si
ISBN/ISSN
0000000000
Start Date
15/12/2008
End Date
17/12/2008
From page
1
To page
1
PRESENTACIONES EN LA PÁGINA WEB DEL CONGRESO
Participants
  • AUTOR: C. RUBIO-GONZÁLEZ (CIDESI. MÉXICO)
  • AUTOR: L. GONZALO (CENTRO LÁSER UPM)
  • Autor: Juan Antonio Porro Gonzalez (UPM)
  • Autor: Carlos Luis Molpeceres Alvarez (UPM)
  • Autor: Manuel Blasco Litago (UPM)
  • AUTOR: O. GUARNEROS (CENTRO LÁSER UPM)
  • Autor: Miguel Morales Furio (UPM)
  • AUTOR: G. GÓMEZ-ROSAS (CUCEI. Universidad de Guadalajara. Guadalajara. Jalisco. MEXICO)
  • Autor: Jose Luis Ocaña Moreno (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Ingeniería y Aplicaciones del Láser
  • Centro o Instituto I+D+i: Centro Laser
  • Departamento: Física Aplicada a la Ingeniería Industrial
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