A visualization of shear strain in processing by high-pressure torsion
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Optical microscopy was used to examine the shear strain imposed in duplex stainless steel disks during processing by high-pressure torsion (HPT). The results show a double-swirl pattern emerges in the early stages of HPT and the two centres of the swirl move towards the centre of the disk with increasing revolutions. Local shear vortices also develop with increasing numbers of revolutions. At 20 revolutions, there is a uniform shear strain pattern throughout the disk and no local shear vortices.
KeywordsVortex Shear Strain Duplex Stainless Steel Local Vortex Large Shear Strain
The authors are indebted to Professor J. T. Wang for his extensive discussion of swirling phenomena in nature and they are grateful for scientific and technical input and support from the Australian Microscopy & Microanalysis Research Facility node at the University of Sydney. This project was supported by the Australian Research Council [Grant No. DP0772880 (Y.C., Y.B.W., and X.Z.L.)], the US Army Research Office (Grant No.W911NF-08-1-0201, T.G.L.) and the U.S. DOE IPP program (Y.T.Z.).
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