Journal
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
Volume 23, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0965-0393/23/2/025011
Keywords
dislocation; TWIP steel; plastic deformation; strain hardening; temperature
Funding
- National Natural Science Foundation of China [51275296, 51375307, 51222505]
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Considering dynamic recovery/recrystallization and twinning effects, in this paper we develop a dislocation-based model to study the strain hardening behavior of TWIP steel. In the model, the dislocation evolution is controlled through a dynamic recovery/recrystallization process at high temperatures, and is primarily dominated by a twinning-induced plasticity (TWIP) process at moderate/ambient temperatures. The corresponding dislocation evolution model is established based on irreversible thermodynamics at high temperatures and conventional plasticity theory at moderate/ambient temperatures, respectively. A factor of delta is introduced to reflect the mixture effect of dynamic recovery/recrystallization and twinning on dislocation evolution, and d increases with deformation temperature. The stress-strain response and strain hardening behavior of TWIP steel (Fe-22Mn-0.6C) are validated at 293, 473, 573, 673, 773 and 873 K. Moreover, the mixture influence of dynamic recovery/recrystallization and twinning on the strain hardening behavior of TWIP steel is analyzed at 293, 473 and 573 K.
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