Constitutive Modeling of the Tensile Behavior of Al-TWIP Steel |
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| Authors: | Jinkyung Kim Yuri Estrin Hossein Beladi Ilana Timokhina Kwang-Geun Chin Sung-Kyu Kim Bruno C De Cooman |
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| Affiliation: | (1) Materials Design Laboratory, Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, South Korea;(2) Center for Advanced Hybrid Materials, Department of Materials Engineering, Monash University, Clayton, VIC, 3800, Australia;(3) CSIRO Division of Process Science and Engineering, Clayton, VIC, Australia;(4) Center for Material and Fibre Innovation, Deakin University, Geelong, VIC, 3216, Australia;(5) Technical Research Laboratories, POSCO Gwangyang Works, Gwangyang, Jeonnam, 545-090, South Korea; |
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| Abstract: | High Mn steels demonstrate an exceptional combination of high strength and large ductility as a result of their high strain-hardening
rate during deformation. The microstructure evolution and strain-hardening behavior of Fe18Mn0.6C1.5Al TWIP steel in uniaxial
tension were examined. The purpose of this study was to determine the contribution of all the relevant deformation mechanisms—slip,
twinning, and dynamic strain aging. Constitutive modeling was carried out based on the Kubin–Estrin model, in which the densities
of mobile and forest dislocations are coupled to account for the interaction between the two dislocation populations during
straining. These coupled dislocation densities were used to simulate the contribution of dynamic strain aging to the flow
stress. The model was modified to include the effect of twinning. To ascertain the validity of the model, the microstructural
evolution was characterized in detail by means of transmission electron microscopy and electron back-scatter diffraction. |
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