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Three-dimensional shear strain patterns induced by high-pressure torsion and their impact on hardness evolution

Three-dimensional shear strain patterns induced by high-pressure torsion and their impact on hardness evolution
Three-dimensional shear strain patterns induced by high-pressure torsion and their impact on hardness evolution
The shear strain imposed on austenite/ferrite duplex stainless steel discs at different stages of high-pressure torsion (HPT) processing was imaged in plan-view and cross-section using optical microscopy and scanning electron microscopy. The effect of the shear strain was correlated to the hardness evolution of the discs. The shear-strain patterns are complex and are different on the top and bottom surfaces of the discs. A double-swirl pattern emerged on the top surface in the early stages of HPT. These two centres of the swirl moved towards the centre of the disc as the numbers of HPT revolutions was increased and ultimately the double-swirl evolved into a single-swirl. Less regular shear-strain patterns were observed on the bottom surfaces of the discs. Multiple ring-like patterns with mirror symmetry over the central axes of the discs were visible from cross-sectional observations. Nanoindentation testing on the two surfaces and a cross-section of HPT discs showed that the hardness is insensitive to specific shear-strain patterns, but is closely related to the widths of the austenite and ferrite phase domains. Late in the deformation process, the hardness in the interior of an HPT disc may be higher than at either of the disc surfaces because of the development of finer microstructural phase distributions
1359-6454
3903-3914
Cao, Y.
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Wang, Y.B.
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Figueiredo, R.B.
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Chang, L.
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Liao, X.Z.
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Kawasaki, M.
d0ce18b9-8403-4db2-9cb2-3a6165f288a6
Zheng, W.
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Ringer, S.P.
2b986d4b-e93c-4801-9a1b-b16b39c30242
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Zhu, Y.T.
ddbd5b30-13ca-45a6-9296-ed5b60811efb
Cao, Y.
2a06c7de-86c5-4804-ab45-20266cbea4cf
Wang, Y.B.
30d7b540-dc88-4382-867a-28d0354a8495
Figueiredo, R.B.
1b4f5fa6-b201-4435-8f5e-13833fc8d504
Chang, L.
d6c90fb1-6a1c-4ac0-9b98-8556d2e80d4c
Liao, X.Z.
f0645a6d-aee1-4d28-aa13-f1b00fdedc41
Kawasaki, M.
d0ce18b9-8403-4db2-9cb2-3a6165f288a6
Zheng, W.
1158fbd9-706d-4755-a934-e0300c538a2a
Ringer, S.P.
2b986d4b-e93c-4801-9a1b-b16b39c30242
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Zhu, Y.T.
ddbd5b30-13ca-45a6-9296-ed5b60811efb

Cao, Y., Wang, Y.B., Figueiredo, R.B., Chang, L., Liao, X.Z., Kawasaki, M., Zheng, W., Ringer, S.P., Langdon, T.G. and Zhu, Y.T. (2011) Three-dimensional shear strain patterns induced by high-pressure torsion and their impact on hardness evolution. Acta Materialia, 59 (10), 3903-3914. (doi:10.1016/j.actamat.2011.03.015).

Record type: Article

Abstract

The shear strain imposed on austenite/ferrite duplex stainless steel discs at different stages of high-pressure torsion (HPT) processing was imaged in plan-view and cross-section using optical microscopy and scanning electron microscopy. The effect of the shear strain was correlated to the hardness evolution of the discs. The shear-strain patterns are complex and are different on the top and bottom surfaces of the discs. A double-swirl pattern emerged on the top surface in the early stages of HPT. These two centres of the swirl moved towards the centre of the disc as the numbers of HPT revolutions was increased and ultimately the double-swirl evolved into a single-swirl. Less regular shear-strain patterns were observed on the bottom surfaces of the discs. Multiple ring-like patterns with mirror symmetry over the central axes of the discs were visible from cross-sectional observations. Nanoindentation testing on the two surfaces and a cross-section of HPT discs showed that the hardness is insensitive to specific shear-strain patterns, but is closely related to the widths of the austenite and ferrite phase domains. Late in the deformation process, the hardness in the interior of an HPT disc may be higher than at either of the disc surfaces because of the development of finer microstructural phase distributions

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More information

Published date: June 2011
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 194813
URI: https://eprints.soton.ac.uk/id/eprint/194813
ISSN: 1359-6454
PURE UUID: 67f861d1-07b3-4074-9876-d1dfa4573360
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 11 Aug 2011 08:07
Last modified: 06 Jun 2018 12:48

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Contributors

Author: Y. Cao
Author: Y.B. Wang
Author: R.B. Figueiredo
Author: L. Chang
Author: X.Z. Liao
Author: M. Kawasaki
Author: W. Zheng
Author: S.P. Ringer
Author: T.G. Langdon ORCID iD
Author: Y.T. Zhu

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