The relative contributions of TWIP and TRIP to strength in fine grained medium-Mn steels
File(s)1-s2.0-S0921509322012448-main.pdf (7.4 MB)
Published version
Author(s)
Kwok, TWJ
Gong, P
Rose, R
Dye, D
Type
Journal Article
Abstract
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.
Date Issued
2022-10-10
Date Acceptance
2022-08-22
ISSN
0921-5093
Publisher
Elsevier BV
Start Page
1
End Page
13
Journal / Book Title
Materials Science and Engineering: A
Volume
855
Copyright Statement
© 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Identifier
https://www.sciencedirect.com/science/article/pii/S0921509322012448?via%3Dihub
Subjects
cond-mat.mtrl-sci
cond-mat.mtrl-sci
0910 Manufacturing Engineering
0912 Materials Engineering
0913 Mechanical Engineering
Materials
Publication Status
Published
Article Number
143864
Date Publish Online
2022-08-27