This research was carried out under the project numbers M41.10.08322 in the framework of the Research Program of the Materials innovation institute (www.m2i.nl). Support and technical discussions with Arjan Thijssen, Wim Verwaal, and Jos van Meel (Faculty of Civil Engineering and Geosciences, Delft University of Technology) are appreciated.
Linking Porosity to Rolling Reduction and Fatigue Lifetime of Hot Rolled AA7xxx Alloys by 3D X-Ray Computed Tomography†
Article first published online: 24 MAY 2012
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Volume 14, Issue 7, pages 457–463, July 2012
How to Cite
Wu, X., Schlangen, E. and van der Zwaag, S. (2012), Linking Porosity to Rolling Reduction and Fatigue Lifetime of Hot Rolled AA7xxx Alloys by 3D X-Ray Computed Tomography. Adv. Eng. Mater., 14: 457–463. doi: 10.1002/adem.201200087
- Issue published online: 3 JUL 2012
- Article first published online: 24 MAY 2012
- Manuscript Accepted: 23 APR 2012
- Manuscript Received: 29 FEB 2012
A set of hot rolled 7xxx aluminum alloys with different casting conditions and modification of processing conditions were analyzed on their fatigue life time as well as the internal microstructure using 3D computed X-ray tomography with a lab scale scanner and optical microscopy. It is shown that large retained casting pores exist in samples with low reduction rate. The modification on the hot rolling process is now proved to be much more effective on removing large casting pores in the alloy. It is also found that with the improved casting conditions and the additional deformation imposed by increased rolling reduction, this advantage is getting retarded. The combination of porosity analysis with low cycle fatigue test at peak stress of 300 MPa indicates that reduction of the size of large pores in the sample down to 10 µm will lead to greatly improved fatigue life times.