ISSN:
1662-9752
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Laser shock peening is a very effective mechanical surface treatment to enhance thefatigue behaviour of highly stressed components. In this work the effect of different laser shockpeening conditions on the residual stress depth profile and fatigue behaviour without any sacrificialcoating layer is investigated for two high strength titanium alloys, Ti-6Al-4V and Timetal LCB.The results show that the optimization of peening conditions is crucial to obtain excellent fatigueproperties. Especially, power density, spot size and coverage severely influence the residual stressprofile of laser shock peened Ti-6Al-4V and Timetal LCB specimens. For both alloys, subsurfaceas well as surface compressive residual stress peaks can be obtained by varying the peeningconditions. In general, Timetal LCB exhibits steeper stress gradients than Ti-6Al-4V for identicalpeening conditions. The main parameters affecting the fatigue life are near-surface cold work andcompressive residual stresses
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.129.pdf
