Ductility and formability of three high-Mn TWIP steels in quasi-static and high-speed tensile and Erichsen tests

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 t...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2018-01, Vol.712, p.255-265
Hauptverfasser: Hamada, A.S., Kisko, A., Khosravifard, A., Hassan, M.A., Karjalainen, L.P., Porter, D.
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container_title Materials science & engineering. A, Structural materials : properties, microstructure and processing
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creator Hamada, A.S.
Kisko, A.
Khosravifard, A.
Hassan, M.A.
Karjalainen, L.P.
Porter, D.
description 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 high-speed 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/m2 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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In the austenitic - ferritic 21Mn-3Al-3Si steel strain-induced martensite was formed, but the ferrite phase seemed to impair formability.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.msea.2017.11.111</doi><tpages>11</tpages></addata></record>
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subjects Austenitic stainless steels
Deformation
Deformation twinning
Diffraction
Dislocations
Ductility
Ductility tests
Electron backscatter diffraction
Elongation
Energy consumption
Ferritic stainless steels
Formability
High speed
High-Mn TWIP steel
High-speed Erichsen test
Martensite
Mechanical twinning
Necking
Split-Hopkinson tensile test
Stacking fault energy
Strain
Strain rate
Stretch formability
Tensile tests
TWIP steels
X-ray diffraction
title Ductility and formability of three high-Mn TWIP steels in quasi-static and high-speed tensile and Erichsen tests
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