Thermoelectric assessment of laser peening induced effects on a metallic biomedical Ti6Al4V

Carreón, H. and Barriuso, S. and Porro González, Juan Antonio and González-Carrasco, J. L. and Ocaña Moreno, José Luis (2014). Thermoelectric assessment of laser peening induced effects on a metallic biomedical Ti6Al4V. In: "Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIV", ., San Francisco. ISBN 9780819498854. pp..

Description

Title: Thermoelectric assessment of laser peening induced effects on a metallic biomedical Ti6Al4V
Author/s:
  • Carreón, H.
  • Barriuso, S.
  • Porro González, Juan Antonio
  • González-Carrasco, J. L.
  • Ocaña Moreno, José Luis
Item Type: Presentation at Congress or Conference (Article)
Event Title: Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIV
Event Dates: .
Event Location: San Francisco
Title of Book: Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIV
Date: 2014
ISBN: 9780819498854
Volume: 8972
Subjects:
Freetext Keywords: Laser shock peening; Thermoelectric Measurements; Ti-6Al-4V; Biomaterial
Faculty: E.T.S.I. Industriales (UPM)
Department: Física Aplicada e Ingeniería de Materiales
Creative Commons Licenses: None

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Abstract

Laser peening has recently emerged as a useful technique to overcome detrimental effects associated to another well-known surface modification processes such as shot peening or grit blasting used in the biomedical field. It is worth to notice that besides the primary residual stress effect, thermally induced effects might also cause subtle surface and subsurface microstructural changes that might influence corrosion resistance. Moreover, since maximum loads use to occur at the surface, they could also play a critical role in the fatigue strength. In this work, plates of Ti-6Al-4V alloy of 7 mm in thickness were modified by laser peening without using a sacrificial outer layer. Irradiation by a Q-switched Nd-YAG laser (9.4 ns pulse length) working in fundamental harmonic at 2.8 J/pulse and with water as confining medium was used. Laser pulses with a 1.5 mm diameter at an equivalent overlapping density (EOD) of 5000 cm-2 were applied. Attempts to analyze the global induced effects after laser peening were addressed by using the contacting and non-contacting thermoelectric power (TEP) techniques. It was demonstrated that the thermoelectric method is entirely insensitive to surface topography while it is uniquely sensitive to subtle variations in thermoelectric properties, which are associated with the different material effects induced by different surface modification treatments. These results indicate that the stress-dependence of the thermoelectric power in metals produces sufficient contrast to detect and quantitatively characterize regions under compressive residual stress based on their thermoelectric power contrast with respect to the surrounding intact material. However, further research is needed to better separate residual stress effects from secondary material effects, especially in the case of low-conductivity engineering materials like titanium alloys.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainMAT2009-14695-C04UnspecifiedUnspecifiedUnspecified
Government of SpainMAT 2012-37736-C05-01UnspecifiedUnspecifiedUnspecified
Government of SpainMAT 2012-37782UnspecifiedUnspecifiedUnspecified

More information

Item ID: 37009
DC Identifier: http://oa.upm.es/37009/
OAI Identifier: oai:oa.upm.es:37009
Official URL: http://spie.org/Publications/Proceedings/Volume/8972
Deposited by: Memoria Investigacion
Deposited on: 31 Mar 2016 15:04
Last Modified: 03 Mar 2017 19:30
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