from the conferences organized by TANGER Ltd.
The work concerns the analysis of the effect of deformation under static and dynamic conditions of high-manganese X42 steel with the SFE value of 24 mJ/m2 on energy absorption capacity and microstructure. X42 steel is graded as a steel that strengthens by mechanical twinning (TWIP effect). TWIP steels have an excellent combination of strength and ductility properties, making them an excellent material for use in controlled crumple zone components for vehicles. A static tensile test and a flywheel machine tensile test at a strain rate corresponding to dynamic conditions were carried out for the tested steel. Microstructure studies were carried out using light microscopy and scanning electron microscopy techniques. From the stress-strain curves, the value of the energy absorbed during plastic deformation was calculated. On the base of the tensile tests, it can be concluded that the material strengthens with the increase in strain rate without losing its good plastic properties. Analysis of the microstructure showed deformation effects in the form of austenite grains elongated in the direction of the tensile direction, within which mechanical twins and deformation bands are formed and the intensity of the generation of twins is correlated to the strain rate. The value of absorbed energy during plastic deformation of the tested steel is at a similar level compared to other TWIP steels expected to be used for structural components absorbing energy during impact.
Keywords: TWIP steel, deformation, energy absorption, strain rate, twinning© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.