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Lookup NU author(s): Dr Peng Gong
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
A novel medium manganese steel with composition Fe–8.3Mn–3.8Al–1.8Si–0.5C–0.06V–0.05Sn was developed and thermomechanically processed through hot rolling and intercritical annealing. The steel possessed a yield strength of 1 GPa, tensile strength of 1.13 GPa and ductility of 41 pct. In order to study the effect of cold rolling after intercritical annealing on subsequent tensile properties, the steel was further cold rolled up to 20 pct reduction. After cold rolling, it was observed that the strain hardening rate increased continuously with increasing cold rolling reduction but without a significant drop in ductility during subsequent tensile tests. The microstructural evolution with cold rolling reduction was analysed to understand the mechanisms behind this phenomena. It was found that cold rolling activated additional twinning systems which provided a large number of potent nucleation sites for strain induced martensite to form during subsequent tensile tests in what can be described as an enhanced TRIP effect.
Author(s): Kwok TWJ, Gong P, Xu X, Nutter J, Rainforth WM, Dye D
Publication type: Article
Publication status: Published
Journal: Metallurgical and Materials Transactions A
Year: 2022
Volume: 53
Pages: 597–609
Print publication date: 01/02/2022
Online publication date: 23/11/2021
Acceptance date: 18/10/2021
Date deposited: 04/04/2023
ISSN (print): 1073-5623
Publisher: Springer
URL: https://doi.org/10.1007/s11661-021-06534-9
DOI: 10.1007/s11661-021-06534-9
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