J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 1301-1306
Characterization of strain rate and temperature dependent mechanical behavior of TWIP steelsM. Hokka, V.-T. Kuokkala, S. Curtze, T. Vuoristo and M. Apostol
Tampere University of Technology, Institute of Materials Science, POB 589, 33101 Tampere, Finland
Published online: 26 July 2006
Two grades of high manganese TWIP steels with aluminum, silicon, and chromium additions were prepared and studied by mechanical testing and electron microscopy. A high/low temperature Hopkinson Split Bar equipment was designed and built to enable the characterization of the mechanical behavior of the test materials in the temperature range of –150 to C at strain rates ranging from 10 - 4 to 104 s - 1. Dislocation and twin structures were investigated by transmission electron microscopy. Increasing strain rate was found to increase the number of twins in the microstructure and to lower the critical strain at which twinning starts to control the deformation and hardening behavior of the studied TWIP steels.
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