Browse by author
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 medium Mn steel of composition Fe-4.8Mn-2.8Al-1.5Si-0.51C (wt.%) was processed to obtain two different microstructures representing two different approaches in the hot rolling mill, resulting in equiaxed vs. mixed equiaxed and lamellar microstructures. Both were found to exhibit a simultaneous Twinning Induced Plasticity and Transformation Induced Plasticity (TWIP ＋ TRIP) mechanism where deformation twins and �′-martensite formed independently of twinning with strain. Interrupted tensile tests were conducted in order to investigate the differences in deformation structures between the two microstructures. A constitutive model was used to find that, surprisingly, twinning contributed relatively little to the strength of the alloy, chiefly due to the fine initial slip lengths that then gave rise to relatively little opportunity for work hardening by grain subdivision. Nevertheless, with lower high-cost alloying additions than equivalent Dual Phase steels (2–3 wt% Mn) and greater ductility, medium-Mn TWIP ＋ TRIP steels still represent an attractive area for future development.
Author(s): Kwok TWJ, Gong P, Rose R, Dye D
Publication type: Article
Publication status: Published
Journal: Materials Science and Engineering: A
Year: 2022
Volume: 855
Print publication date: 10/10/2022
Online publication date: 27/08/2022
Acceptance date: 22/08/2022
Date deposited: 29/03/2023
ISSN (print): 0921-5093
ISSN (electronic): 1873-4936
Publisher: Elsevier BV
URL: https://doi.org/10.1016/j.msea.2022.143864
DOI: 10.1016/j.msea.2022.143864
Altmetrics provided by Altmetric
