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Work hardening behaviour in banded dual phase steel structures with improved formability

Ennis, BL; Bos, C; Aarnts, MP; Lee, PD; Jimenez-Melero, E; (2018) Work hardening behaviour in banded dual phase steel structures with improved formability. Materials Science and Engineering: A , 713 pp. 278-286. 10.1016/j.msea.2017.12.078. Green open access

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Abstract

In this work, we show how the presence of microstructural banding and segregation affects the work-hardening behaviour of a dual phase steel with improved formability. This steel contains chemical segregation inherited from the casting process. Our previously developed 3D cellular automaton model allowed us to design thermo-mechanical processes to either promote or suppress banding. The bands are properly described as in-plane sheets of martensite grains. Mechanical testing data revealed a significant reduction in tensile strength in banded structures for a similar level of ductility. The work-hardening behaviour in the pre-yield regime, including the yield strength itself, is not correlated to the incidence of segregation and/or microstructural banding. The reduction in ultimate tensile strength in banded structures stems from a reduced work-hardening capacity in the post-yield regime. This is due to increased austenite stability in the banded steels, coupled to the anisotropic strain localisation in the ferritic matrix between martensite bands.

Type: Article
Title: Work hardening behaviour in banded dual phase steel structures with improved formability
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.msea.2017.12.078
Publisher version: https://doi.org/10.1016/j.msea.2017.12.078
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Mechanical characterization, Hardening, Steel, Austenite, Martensite, Thermo-mechanical processing
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/10062978
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