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Microstructural and hardness evolution in a duplex stainless steel processed by high-pressure torsion

Microstructural and hardness evolution in a duplex stainless steel processed by high-pressure torsion
Microstructural and hardness evolution in a duplex stainless steel processed by high-pressure torsion
The duplex stainless steel 2205, designated DSS2205 and having a duplex structure comprising ferrite and austenite phases, was processed by high-pressure torsion (HPT) and the microstructural and hardness evolutions were investigated after various HPT revolutions and at different positions within the specimens. The results show that the grain refinement induced by severe deformation processing is different in the ferrite and austenite phases such that the ferrite grains are refined via dislocation subdivision, whereas grain refinement in the austenite phase depends mainly on the interaction of dislocations and twin boundaries at relatively low strains. When the numbers of revolutions increases, the grain refinement in austenite restricts the occurrence of deformation twinning so that dislocation slip becomes dominant. During HPT processing, the effect of the phase boundaries on the mechanical properties of the alloy is very significant. The results show the average width between two adjacent phases and the hardness of the alloy are generally consistent with the classical Hall–Petch relationship.
duplex stainless steel, Hall-Petch relationship, high-pressure torsion, severe plastic deformation, ultrafine grains
2073-4352
Ma, Ming
3d5e50f4-2e62-49f3-8d71-658c3555124b
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Cheng, Wei
3eb69813-0add-4bab-860a-0a8c9e0c1da0
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Ma, Ming
3d5e50f4-2e62-49f3-8d71-658c3555124b
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Cheng, Wei
3eb69813-0add-4bab-860a-0a8c9e0c1da0
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Ma, Ming, Huang, Yi, Cheng, Wei and Langdon, Terence G (2020) Microstructural and hardness evolution in a duplex stainless steel processed by high-pressure torsion. Crystals. (doi:10.3390/cryst10121138).

Record type: Article

Abstract

The duplex stainless steel 2205, designated DSS2205 and having a duplex structure comprising ferrite and austenite phases, was processed by high-pressure torsion (HPT) and the microstructural and hardness evolutions were investigated after various HPT revolutions and at different positions within the specimens. The results show that the grain refinement induced by severe deformation processing is different in the ferrite and austenite phases such that the ferrite grains are refined via dislocation subdivision, whereas grain refinement in the austenite phase depends mainly on the interaction of dislocations and twin boundaries at relatively low strains. When the numbers of revolutions increases, the grain refinement in austenite restricts the occurrence of deformation twinning so that dislocation slip becomes dominant. During HPT processing, the effect of the phase boundaries on the mechanical properties of the alloy is very significant. The results show the average width between two adjacent phases and the hardness of the alloy are generally consistent with the classical Hall–Petch relationship.

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Accepted/In Press date: 9 December 2020
Published date: 15 December 2020
Keywords: duplex stainless steel, Hall-Petch relationship, high-pressure torsion, severe plastic deformation, ultrafine grains

Identifiers

Local EPrints ID: 445677
URI: http://eprints.soton.ac.uk/id/eprint/445677
ISSN: 2073-4352
PURE UUID: d32f5f9b-aec5-431f-9960-47747ce2de0d
ORCID for Yi Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for Terence G Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 06 Jan 2021 17:31
Last modified: 18 Feb 2021 17:17

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Contributors

Author: Ming Ma
Author: Yi Huang ORCID iD
Author: Wei Cheng

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