Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 712, Issue -, Pages 255-265Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.11.111
Keywords
High-Mn TWIP steel; Split-Hopkinson tensile test; Ductility; High-speed Erichsen test; Stretch formability; Deformation twinning
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Funding
- Research Fund for Coal and Steel (RFCS)
- European Commission, Brussels [RFSR-CT-2005-00030]
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The ductility and formability properties of three high-Mn TWIP steels were investigated under quasi-static and high-speed deformation conditions. The ductility was evaluated from conventional and Hopkinson split-bar tensile tests at 1250 s(-1) and the stretch formability was evaluated using Erichsen tests made with a special highspeed electro-hydraulic forming machine at about 1000 s(-1). The data were related to microstructural features revealed using electron backscatter diffraction and X-ray diffraction. Furthermore, the stacking fault energy (SFE) was estimated using a thermodynamic approach. It was found that the 0.6C-22Mn and 0.2C-21Mn-0.23N steels (compositions in wt%) with SFEs of 23-24 mJ/m(2) exhibited good elongation and a large Erichsen index at both low and high strain rates. These were attributed to intensive mechanical twinning though partly replaced by dislocation slip in deformation bands in the high-speed tests. However, it was noticed that the high-speed stretching failure of these TWIP steels occurred in the uniform elongation range without diffuse necking. In the austenitic - ferritic 21Mn-3Al-3Si steel strain-induced martensite was formed, but the ferrite phase seemed to impair formability.
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