Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 561, Issue -, Pages 329-337Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.10.020
Keywords
Fe-30Mn-3Si-4Al steel; Cold rolling; Mechanical properties; Deformation twinning
Categories
Funding
- Fundamental Research Funds for the Central Universities [N090202001, N100702001]
- National Natural Science Foundation of China [51231002]
- Open Program of the State Key Lab of Rolling Automation [2012001]
- U.S. Department of Energy (DOE) [DE-AC05-76RL01830]
- DOE's Office of FreedomCAR and Vehicle Technologies under the Automotive Lightweighting Materials Program
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The effects of cold rolling on microstructure evolution and the associated mechanical properties of Fe-30Mn-3Si-4Al-0.093C twinning-induced plasticity (TWIP) steel are examined in this work with reduction levels of 10%, 20%, 30%, 40%, 50%, 60%, and 70%. Through texture analysis and transmission electron microscopy (TEM) observations, it is suggested that slip, mechanical twinning, the interaction between dislocation/twin boundaries (TB), and shear band formation have influenced the observed mechanical behavior and development of texture. Special components of weak initial textures are preferential for mechanical twinning, resulting in an increase in strain hardening rate. By mechanical twinning, the {1 1 1} < 1 1 2 > orientation is rotated into a position at the vicinity of the {1 1 0} < 0 0 1 > Goss orientation, and the {5 5 2} < 1 1 5 > (Cu-twin) texture is transformed to the {1 1 0} < 0 0 1 > orientation. The evolution of texture is closely related to the onset of shear banding resulting from deformation twinning. The sample with 10% cold reduction exhibits a favorable combination of yield strength and ductility, indicating a considerable capacity for energy absorption. With increasing rolling reductions, the deformation of the samples becomes inhomogeneous due to the high anisotropy of the microstructure. The localized shear bands resulting from the excessive cold rolling are detrimental to the ductility of the present TWIP steel. (C) 2012 Elsevier B.V. All rights reserved.
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