ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The present paper treats results of laser shock processing applied to a precipitationhardenedENAW 6082-T651 aluminium alloy. Processing was performed with a Nd:YLF-yttriumlithium fluoride crystal laser with power densities of 2 and 4 GW/cm2, producing a pulse of 18 ns.Laser shock processing experiments were performed with the closed ablation method, theapplication of an ablative coating and a transparent tamping medium to obtain a higher shock-wavepressure. In the first phase, the surface study focused on the record of surface profile with aroughness gauge and on an evaluation of surface topography at a scanning electron microscope. Inthe second phase, residual stresses were measured using the relaxation hole-drilling method at aprocessed specimen surface. Then followed measurement of microhardness in the cross section. Thehardening results obtained were evaluated on the basis of variations of residual stresses and ofmicrohardness, and of macro and microstructural changes of the surface, i.e. the surface layer. Thepurpose of processing was to improve fatigue strenght and, consequently, extend the life of amachine component in operation
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.589.379.pdf
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