Performance of Twinning-Induced Plasticity Steel Processed by Multipass Equal Channel Angular Pressing at High Temperatures
N. A. Enikeeva, b, *, M. M. Abramovaa, I. V. Smirnovb, A. M. Mavlyutovb, c, J. G. Kimd, C. S. Leee, and H. S. Kime
aLaboratory for Metals and Alloys under Extreme Impacts, Ufa University of Science and Technology, Ufa, 450076 Russia
bSaint Petersburg State University, Saint Petersburg, 199034 Russia
cIoffe Institute, Saint Petersburg, 194021 Russia
dDepartment of Materials Engineering and Convergence Technology, Center for K-Metals, Gyeongsang National University, Jinju, 52828 South Korea
eGraduate Institute of Ferrous and Eco Materials Technology, Pohang University of Science and Technology, Pohang, 37673 South Korea
email: *nariman.enikeev@gmail.com
Received 1 February, 2024
Abstract— The present paper deals with twinning-induced plasticity (TWIP) steels with the microstructure refined by severe plastic deformation via equal channel angular pressing and explores the mechanical behavior of steel with qualitatively different microstructures formed in the temperature range 400–900°C. Mechanical characteristics of the steel in different structural states are studied in static tensile tests, biaxial and dynamic tests. Structural changes in the material during severe deformation at different temperatures are discussed, and their effect on the mechanical parameters of TWIP steel is considered. High temperatures of equal channel angular pressing allow for more homogeneous recrystallized structures, which ensure the best combination of the yield stress, formability, plasticity, and crack resistance. These findings can be important in developing high-performance steels for the automotive and hydrogen industries.
Keywords:
twinning-induced plasticity,
austenitic steels,
ultrafine-grained materials,
severe plastic deformation,
microstructure,
strength,
plasticity,
formability,
crack resistance,
deformation mechanisms
DOI: 10.1134/S1029959924060079