Stored energy in ultrafine-grained 316L stainless steel processed by high-pressure torsion
Stored energy in ultrafine-grained 316L stainless steel processed by high-pressure torsion
The energy stored in severely deformed ultrafine-grained (UFG) 316L stainless steel was investigated by differential scanning calorimetry (DSC). A sample was processed by high-pressure torsion (HPT) for N = 10 turns. In the DSC thermogram, two peaks were observed. The first peak was exothermic and related to the annihilation of vacancies and dislocations. During this recovery, the phase composition and the average grain size were practically unchanged. The energy stored in dislocations wascalculated and compared with the heat released in the exothermic DSC peak. The difference was related to the annihilation of vacancy-like defects with a concentration of ~5.2 × 10-4. The second DSC peak was endothermic which was caused by a reversion of α’-martensite into γ-austenite, however in this temperature range dislocation annihilation and a moderate grain growth also occurred. The specific energy of the reverse martensitic phase transformation was determined as about -11.7 J/g.
339-347
El-Tahawy, Moustafa
2d81c03f-2dc2-4cc1-b422-c2b21f6854fd
Huang, Yi
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Um, Taekyung
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Choe, Heeman
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Lábár, János L.
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Langdon, Terence G.
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Gubicza, Jenő
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30 November 2017
El-Tahawy, Moustafa
2d81c03f-2dc2-4cc1-b422-c2b21f6854fd
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Um, Taekyung
fb4a8ca6-c7b7-4d0b-a8ec-55ab4036ac60
Choe, Heeman
c5ceccf4-7cde-4ed7-97d4-390091298e28
Lábár, János L.
525b4a41-b14b-44fb-9681-6b4d7086e2ac
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Gubicza, Jenő
e43bdde3-aee3-4542-9cff-cb80fa3caa99
El-Tahawy, Moustafa, Huang, Yi, Um, Taekyung, Choe, Heeman, Lábár, János L., Langdon, Terence G. and Gubicza, Jenő
(2017)
Stored energy in ultrafine-grained 316L stainless steel processed by high-pressure torsion.
Journal of Materials Research and Technology, 6 (4), .
(doi:10.1016/j.jmrt.2017.05.001).
Abstract
The energy stored in severely deformed ultrafine-grained (UFG) 316L stainless steel was investigated by differential scanning calorimetry (DSC). A sample was processed by high-pressure torsion (HPT) for N = 10 turns. In the DSC thermogram, two peaks were observed. The first peak was exothermic and related to the annihilation of vacancies and dislocations. During this recovery, the phase composition and the average grain size were practically unchanged. The energy stored in dislocations wascalculated and compared with the heat released in the exothermic DSC peak. The difference was related to the annihilation of vacancy-like defects with a concentration of ~5.2 × 10-4. The second DSC peak was endothermic which was caused by a reversion of α’-martensite into γ-austenite, however in this temperature range dislocation annihilation and a moderate grain growth also occurred. The specific energy of the reverse martensitic phase transformation was determined as about -11.7 J/g.
Text
Gubicza_JMRT_2017_accepted manuscript
- Accepted Manuscript
More information
Accepted/In Press date: 6 May 2017
e-pub ahead of print date: 19 June 2017
Published date: 30 November 2017
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 410621
URI: http://eprints.soton.ac.uk/id/eprint/410621
ISSN: 2238-7854
PURE UUID: d9cd9a17-d1b6-4bfd-ba6f-be2cf1778e48
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Date deposited: 09 Jun 2017 09:15
Last modified: 16 Mar 2024 05:19
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Contributors
Author:
Moustafa El-Tahawy
Author:
Yi Huang
Author:
Taekyung Um
Author:
Heeman Choe
Author:
János L. Lábár
Author:
Jenő Gubicza
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