Dramatic improvement of strain hardening and ductility to 95% in highly-deformable high-strength duplex lightweight steels

Abstract Ferrite + austenite duplex lightweight steels have been actively developed by adding low-density Al for overcoming a limitation of stiffness deterioration by a traditional approach to obtain a weight reduction. Multiple-stage deformation mechanism in lightweight steels, i.e., simultaneous f...

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Autores principales:	Seok Su Sohn, Hyejin Song, Jai-Hyun Kwak, Sunghak Lee
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0db3bbf259e846429163df0d5e9382bf
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spelling	oai:doaj.org-article:0db3bbf259e846429163df0d5e9382bf2021-12-02T11:41:21ZDramatic improvement of strain hardening and ductility to 95% in highly-deformable high-strength duplex lightweight steels10.1038/s41598-017-02183-42045-2322https://doaj.org/article/0db3bbf259e846429163df0d5e9382bf2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02183-4https://doaj.org/toc/2045-2322Abstract Ferrite + austenite duplex lightweight steels have been actively developed by adding low-density Al for overcoming a limitation of stiffness deterioration by a traditional approach to obtain a weight reduction. Multiple-stage deformation mechanism in lightweight steels, i.e., simultaneous formation of deformation-induced martensite and deformation twin and additional plasticity by twinning, has been nominated as an attractive strategy, but shows a steady flow behavior with early plastic instability. Here, we present a newly designed Fe-0.3C-9Mn-5Al steel in order to obtain an optimal level of stability of austenite and a resultant outstanding combination of tensile strength and ductility, e.g., 874 MPa and 72%, together with sufficiently high strain hardening. These enhanced properties are attributed to the decreased austenite stability by controlling the austenite size and alloying partitioning due to variation in austenite fraction inside duplex microstructures. The present work gives a promise for structural applications requiring both reduced specific weight and remarkable deformability.Seok Su SohnHyejin SongJai-Hyun KwakSunghak LeeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Seok Su Sohn Hyejin Song Jai-Hyun Kwak Sunghak Lee Dramatic improvement of strain hardening and ductility to 95% in highly-deformable high-strength duplex lightweight steels
description	Abstract Ferrite + austenite duplex lightweight steels have been actively developed by adding low-density Al for overcoming a limitation of stiffness deterioration by a traditional approach to obtain a weight reduction. Multiple-stage deformation mechanism in lightweight steels, i.e., simultaneous formation of deformation-induced martensite and deformation twin and additional plasticity by twinning, has been nominated as an attractive strategy, but shows a steady flow behavior with early plastic instability. Here, we present a newly designed Fe-0.3C-9Mn-5Al steel in order to obtain an optimal level of stability of austenite and a resultant outstanding combination of tensile strength and ductility, e.g., 874 MPa and 72%, together with sufficiently high strain hardening. These enhanced properties are attributed to the decreased austenite stability by controlling the austenite size and alloying partitioning due to variation in austenite fraction inside duplex microstructures. The present work gives a promise for structural applications requiring both reduced specific weight and remarkable deformability.
format	article
author	Seok Su Sohn Hyejin Song Jai-Hyun Kwak Sunghak Lee
author_facet	Seok Su Sohn Hyejin Song Jai-Hyun Kwak Sunghak Lee
author_sort	Seok Su Sohn
title	Dramatic improvement of strain hardening and ductility to 95% in highly-deformable high-strength duplex lightweight steels
title_short	Dramatic improvement of strain hardening and ductility to 95% in highly-deformable high-strength duplex lightweight steels
title_full	Dramatic improvement of strain hardening and ductility to 95% in highly-deformable high-strength duplex lightweight steels
title_fullStr	Dramatic improvement of strain hardening and ductility to 95% in highly-deformable high-strength duplex lightweight steels
title_full_unstemmed	Dramatic improvement of strain hardening and ductility to 95% in highly-deformable high-strength duplex lightweight steels
title_sort	dramatic improvement of strain hardening and ductility to 95% in highly-deformable high-strength duplex lightweight steels
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/0db3bbf259e846429163df0d5e9382bf
work_keys_str_mv	AT seoksusohn dramaticimprovementofstrainhardeningandductilityto95inhighlydeformablehighstrengthduplexlightweightsteels AT hyejinsong dramaticimprovementofstrainhardeningandductilityto95inhighlydeformablehighstrengthduplexlightweightsteels AT jaihyunkwak dramaticimprovementofstrainhardeningandductilityto95inhighlydeformablehighstrengthduplexlightweightsteels AT sunghaklee dramaticimprovementofstrainhardeningandductilityto95inhighlydeformablehighstrengthduplexlightweightsteels
_version_	1718395384491933696

Dramatic improvement of strain hardening and ductility to 95% in highly-deformable high-strength duplex lightweight steels

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