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.
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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 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: | https://discovery.ucl.ac.uk/id/eprint/10062978 |
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