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Concurrent microstructural evolution of ferrite and austenite in a duplex stainless steel processed by high-pressure torsion

Concurrent microstructural evolution of ferrite and austenite in a duplex stainless steel processed by high-pressure torsion
Concurrent microstructural evolution of ferrite and austenite in a duplex stainless steel processed by high-pressure torsion
A duplex stainless steel with approximately equal volume fractions of ferrite and austenite was processed by high-pressure torsion. Nano-indentation, electron backscatter diffraction and transmission electron microscopy were used to investigate the hardness and microstructure evolutions of the steel. Despite the different strain-hardening rates of individual ferrite and austenite, the microstructures of the two phases evolved concurrently in such a way that the neighbouring two phases always maintained similar hardness. While the plastic deformation and grain refinement of ferrite occurred mainly via dislocation activities, the plastic deformation and grain refinement process of austenite were more complicated and included deformation twinning and de-twinning in coarse grains, grain refinement by twinning and dislocation–twin interactions, de-twinning in ultrafine grains and twin boundary subdivision.
steel, high-pressure torsion, twinning, de-twinning, grain refinement
1359-6454
16-29
Cao, Y.
2a06c7de-86c5-4804-ab45-20266cbea4cf
Wang, Y.B.
30d7b540-dc88-4382-867a-28d0354a8495
An, X.H.
18016416-a17d-4882-aaa6-5a3c1160e9a9
Liao, X.Z.
f0645a6d-aee1-4d28-aa13-f1b00fdedc41
Kawasaki, M.
d0ce18b9-8403-4db2-9cb2-3a6165f288a6
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
An, X.H.
18016416-a17d-4882-aaa6-5a3c1160e9a9
Liao, X.Z.
f0645a6d-aee1-4d28-aa13-f1b00fdedc41
Kawasaki, M.
d0ce18b9-8403-4db2-9cb2-3a6165f288a6
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., An, X.H., Liao, X.Z., Kawasaki, M., Ringer, S.P., Langdon, T.G. and Zhu, Y.T. (2014) Concurrent microstructural evolution of ferrite and austenite in a duplex stainless steel processed by high-pressure torsion. Acta Materialia, 63, 16-29. (doi:10.1016/j.actamat.2013.09.030).

Record type: Article

Abstract

A duplex stainless steel with approximately equal volume fractions of ferrite and austenite was processed by high-pressure torsion. Nano-indentation, electron backscatter diffraction and transmission electron microscopy were used to investigate the hardness and microstructure evolutions of the steel. Despite the different strain-hardening rates of individual ferrite and austenite, the microstructures of the two phases evolved concurrently in such a way that the neighbouring two phases always maintained similar hardness. While the plastic deformation and grain refinement of ferrite occurred mainly via dislocation activities, the plastic deformation and grain refinement process of austenite were more complicated and included deformation twinning and de-twinning in coarse grains, grain refinement by twinning and dislocation–twin interactions, de-twinning in ultrafine grains and twin boundary subdivision.

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More information

e-pub ahead of print date: 7 October 2013
Published date: 15 January 2014
Keywords: steel, high-pressure torsion, twinning, de-twinning, grain refinement
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 361078
URI: http://eprints.soton.ac.uk/id/eprint/361078
ISSN: 1359-6454
PURE UUID: 8813c685-5658-473c-a2e8-5b92e9586375
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 14 Jan 2014 16:58
Last modified: 15 Mar 2024 03:13

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Contributors

Author: Y. Cao
Author: Y.B. Wang
Author: X.H. An
Author: X.Z. Liao
Author: M. Kawasaki
Author: S.P. Ringer
Author: T.G. Langdon ORCID iD
Author: Y.T. Zhu

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