Surface layer properties and fatigue behavior in Al 7075-T73 and Ti-6Al-4V: Comparing results after laser peening; shot peening and ball-burnishing

Lothar Wagner; Mansour Mhaede; Manfred Wollmann; Igor Altenberger; Yuji Sano

doi:10.1108/17579861111135923

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International Journal of Structural Integrity

ISSN: 1757-9864

Online from: 2010

Subject Area: Mechanical & Materials Engineering

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Surface layer properties and fatigue behavior in Al 7075-T73 and Ti-6Al-4V: Comparing results after laser peening; shot peening and ball-burnishing

Document Information:
Title:	Surface layer properties and fatigue behavior in Al 7075-T73 and Ti-6Al-4V: Comparing results after laser peening; shot peening and ball-burnishing
Author(s):	Lothar Wagner, (Institute of Materials Science and Engineering, Clausthal University of Technology, Clausthal-Zellerfeld, Germany), Mansour Mhaede, (Institute of Materials Science and Engineering, Clausthal University of Technology, Clausthal-Zellerfeld, Germany Faculty of Engineering, Zagazig University, Zagazig, Egypt), Manfred Wollmann, (Institute of Materials Science and Engineering, Clausthal University of Technology, Clausthal-Zellerfeld, Germany), Igor Altenberger, (Wieland-Werke AG, Ulm, Germany), Yuji Sano, (Power and Industrial Systems Research and Development Center, Toshiba Corporation, Yokohama, Japan)
Citation:	Lothar Wagner, Mansour Mhaede, Manfred Wollmann, Igor Altenberger, Yuji Sano, (2011) "Surface layer properties and fatigue behavior in Al 7075-T73 and Ti-6Al-4V: Comparing results after laser peening; shot peening and ball-burnishing", International Journal of Structural Integrity, Vol. 2 Iss: 2, pp.185 - 199
Keywords:	Aircraft, Alloys, Fatigue, Stress (materials), Surface treatment
Article type:	Research paper
DOI:	10.1108/17579861111135923 (Permanent URL)
Publisher:	Emerald Group Publishing Limited
Acknowledgements:	The authors would like to thank Mr Holger Polanetzki of MTU Aero Engines, Munich who provided USP treatments on Al 7075-T73 and Ti-6Al-4V. Part of this work was supported by the Deutsche Forschungsgemeinschaft (DFG) under contract WA 692/31.
Abstract:	Purpose – The purpose of this paper is to investigate the influence of mechanical surface treatments on the surface layer properties and the fatigue performance of the aircraft alloys Al 7075-T73 and Ti-6Al-4V Design/methodology/approach – Laser peening without coating (LPwC), shot peening (SP), ultrasonic shot peening (USP) and ball burnishing (BB) were applied and the resulting changes in surface roughness and residual stress-depth profiles were evaluated. Fatigue performance of both alloys was tested in rotating beam loading (R=-1) on hourglass-shaped specimens and the results were compared with the electrolytically polished (EP) reference conditions. Findings – All studied mechanical surface treatments led to pronounced increases in fully reversed fatigue lives and fatigue strengths in both Al 7075-T73 and Ti-6Al-4V. Originality/value – To the authors' knowledge, this is the first paper that compares fatigue performance of a wide variety of mechanically surface treated conditions in two aircraft alloys.