Engineering mechanical properties by controlling the microstructure of an Fe-Ni-Mn martensitic steel through pre-cold rolling and subsequent heat treatment
Engineering mechanical properties by controlling the microstructure of an Fe-Ni-Mn martensitic steel through pre-cold rolling and subsequent heat treatment
Experiments were conducted to examine the effects of prior cold rolling and subsequent heat treatment on the microstructure, phase evolution and mechanical properties of an Fe-10Ni-7Mn martensitic steel. The results show that 70% cold rolling leads to deformation-induced austenite formation in the microstructure and reduces the size of the martensite blocks. Prior cold rolling increases the reversed austenite volume fraction under post-deformation intercritical annealing (PDIA) at 600 °C compared with the solution annealed condition. Electron back scattering diffraction and dilatometric studies showed that under PDIA there is a reverse transformation of martensite to austenite through a sequential combination of martensitic and diffusional mechanisms. There is also a precipitation of -NiMn particles in the PDIA specimen after subsequent ageing leading to an increase in the ultimate tensile strength in tensile testing. Cyclic tensile testing revealed pseudoelastic behavior in the cold-rolled specimen but this disappeared after PDIA and appeared again after subsequent ageing.
Deformation-induced austenite, Fe-Ni-Mn martensitic steel, Microstructure control, Post-deformation intercritical annealing, Reverse transformation
Koohdar, Hamidreza
6d616b2b-5bc8-4fe7-8f60-f57dcacedd72
Hakimipour, Pouya
9d6aecad-f5c3-4094-b725-1885de5857b9
Jafarian, Hamidreza
2d3dd302-34fa-4066-9ed2-31daecc0c170
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Nili-Ahmadabadi, Mahmoud
14b05165-fc44-4b5f-a21d-db078febeeeb
15 February 2021
Koohdar, Hamidreza
6d616b2b-5bc8-4fe7-8f60-f57dcacedd72
Hakimipour, Pouya
9d6aecad-f5c3-4094-b725-1885de5857b9
Jafarian, Hamidreza
2d3dd302-34fa-4066-9ed2-31daecc0c170
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Nili-Ahmadabadi, Mahmoud
14b05165-fc44-4b5f-a21d-db078febeeeb
Koohdar, Hamidreza, Hakimipour, Pouya, Jafarian, Hamidreza, Langdon, Terence G and Nili-Ahmadabadi, Mahmoud
(2021)
Engineering mechanical properties by controlling the microstructure of an Fe-Ni-Mn martensitic steel through pre-cold rolling and subsequent heat treatment.
Materials Science and Engineering: A, 804, [140760].
(doi:10.1016/j.msea.2021.140760).
Abstract
Experiments were conducted to examine the effects of prior cold rolling and subsequent heat treatment on the microstructure, phase evolution and mechanical properties of an Fe-10Ni-7Mn martensitic steel. The results show that 70% cold rolling leads to deformation-induced austenite formation in the microstructure and reduces the size of the martensite blocks. Prior cold rolling increases the reversed austenite volume fraction under post-deformation intercritical annealing (PDIA) at 600 °C compared with the solution annealed condition. Electron back scattering diffraction and dilatometric studies showed that under PDIA there is a reverse transformation of martensite to austenite through a sequential combination of martensitic and diffusional mechanisms. There is also a precipitation of -NiMn particles in the PDIA specimen after subsequent ageing leading to an increase in the ultimate tensile strength in tensile testing. Cyclic tensile testing revealed pseudoelastic behavior in the cold-rolled specimen but this disappeared after PDIA and appeared again after subsequent ageing.
Text
Koohdar-Manuscript-MSEA
- Accepted Manuscript
More information
Accepted/In Press date: 7 January 2021
e-pub ahead of print date: 11 January 2021
Published date: 15 February 2021
Additional Information:
Publisher Copyright:
© 2021 Elsevier B.V.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
Keywords:
Deformation-induced austenite, Fe-Ni-Mn martensitic steel, Microstructure control, Post-deformation intercritical annealing, Reverse transformation
Identifiers
Local EPrints ID: 446629
URI: http://eprints.soton.ac.uk/id/eprint/446629
ISSN: 0921-5093
PURE UUID: 8ed94a04-2a39-4b88-8397-c1a2feab9766
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Date deposited: 16 Feb 2021 17:35
Last modified: 17 Mar 2024 06:17
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Contributors
Author:
Hamidreza Koohdar
Author:
Pouya Hakimipour
Author:
Hamidreza Jafarian
Author:
Mahmoud Nili-Ahmadabadi
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