High strength properties and a wide range of deformation hardening, particularly in case of dynamic deformation, enable application of manganese steels in the structure of highly strained elements constituting mechanical vehicle framework. This is true primarily for railway, automotive and military industries, where not only decrease in weight, but also safety improvements are of importance. Favourable combination of strength and ductility, as well as excellent ability to absorb energy in the deformation process which is a characteristic of those steels allow the assumption that the possibilities of their usage in the structures of means of transport will become more and more common, and that the demand for materials of that kind will be growing along with the sharpening of structure regulations and bump test norms. Mechanical properties together with mass density higher than in traditional types of steel constitute a new quality of steel structure materials designed for those industries. Manganese steels are characterized by their ability to activate distinct deformation mechanisms, such as twinning induced by plastic deformation, that is referred to in technical literature as the TWIP effect (twinning-induced plasticity), as well as MBIP (microband-induced plasticity), that are responsible for the combination of high strength and ductility in steels to be examined and consequently, for high energy absorption, a basic control parameter in crush tests carried out on vehicles. The aim of this research is to explain of structural phenomena that take place during mechanical twinning induced as well as formation deformation microbands in austenitic matrix by dynamic plastic deformation in steels with the TWIP effect. This research focuses on the analysis of structure changes taking place in manganese steels depending on the stacking-fault energy (SFE) affected by chemical composition, and on the applied variable plastic deformation rate. The conducted research will generate data for the model description of structure changes under the influence of varying deformation rate that take place in manganese steels of different SFE value.Keywords: manganese steels, TWIP effect, dynamic deformation, microstructures
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