The mechanism of twin thickening and the elastic strain state of TWIP steel nanotwins

Kwok, T. W.J.; McAuliffe, T. P.; Ackerman, A. K.; Savitzky, B. H.; Danaie, M.; Ophus, C.; Dye, D.

doi:10.1016/j.msea.2023.145005

Title: The mechanism of twin thickening and the elastic strain state of TWIP steel nanotwins

Journal Article · Wed Apr 05 00:00:00 EDT 2023 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2023.145005· OSTI ID:2234135

Kwok, T. W.J. ^[1];

^[1]; Ackerman, A. K. ^[1];

^[2]; Danaie, M. ^[3];

^[2];

^[1]

Imperial College, London (United Kingdom)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry
Electron Physical Science Imaging Centre (ePSIC), Oxford (United Kingdom). Diamond Light Source, Ltd.

A Twinning Induced Plasticity (TWIP) steel with a nominal composition of Fe-16.4Mn-0.9C-0.5Si-0.05Nb-0.05V was deformed to an engineering strain of 6%. The strain around the deformation twins were mapped using the 4D-STEM technique. Strain mapping showed a large average elastic strain of approximately 6% in the directions parallel and perpendicular to the twinning direction. However, the large average strain comprised of several hot spots of even larger strains of up to 12%. These hot spots could be attributed to a high density of sessile Frank dislocations on the twin boundary and correspond to shear stresses of 1–1.5 GPa. The strain and therefore stress fields are significantly larger than other materials known to twin and are speculated to be responsible for the early thickness saturation of TWIP steel nanotwins. The ability to keep twins extremely thin helps improve grain fragmentation, i.e. the dynamic Hall–Petch effect, and underpins the large elongations and strain hardening rates in TWIP steels.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2234135

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Vol. 873; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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