Abstract
Recent technological advances have made it possible to manufacture steels with both high strength and high ductility. This is the case for Twinning-Induced Plasticity (TWIP) steels which are characterized by a twinning deformation mechanism, which is responsible for its excellent properties. In this work, TWIP980 steel was tested under tensile loading along the rolling direction until pre-deformations of 10%, 20%, and 30% were reached. In order to assess the effect of the deformation path, the pre-deformed samples were reloaded in directions of 0°, 45° and 90° against the rolling direction. Microstructural analysis was performed by means of optical microscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The yield stress increased with the imposed deformation for all the tested directions. As the strain path changed from 0° to 90°, the yield stress for reload decreased, and the Bauschinger effect and permanent softening was observed. The yield plateau was observed as being directly influenced by deformation path without influence by strain rate and temperature.
Highlights
Twinning-Induced Plasticity (TWIP) steels are characterized by a high Mn content, which is responsible for their austenite stability at room temperature
Due to their austenitic microstructure, TWIP steels are highly ductile at room temperature and for any plastic strain
ItAdditional is important to guarantee the same loading speed during the entire test. It the can be plateau: computed parameters were evaluated in order to vassess their influence yield plateau: Additional parameters were evaluated in order to assess their influence on on the yield by considering the machine’s crosshead displacement δ for a defined loading frequency f asduring follows: The machine’s loading velocity in the elastic–plastic transition sample temperature during
Summary
Twinning-Induced Plasticity (TWIP) steels are characterized by a high Mn content, which is responsible for their austenite stability at room temperature. Several authors have been trying to characterize the deformation mechanisms by twinning in TWIP steels [6,7,8,9,10,11]. This deformation mechanism results in steels with high strength and ductility, making TWIP steels highly attractive for several industries such as the automotive industry [12].
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