5th International High Manganese Steel Conference - HMNS 2022

Influence of nitrogen and carbon on mechanical properties of TWIP steels depending on grain size has been controversially discussed. In addition, especially in high manganese steels, the temperature dependence of the stacking fault energy can lead to the activation or suppression of different deformation mechanisms during a pre-deformation. In this way, a complex interaction between dislocation structures, twins and even martensite can take place and a unique microstructure can be obtained. As a result, diverse combinations of strength and ductility can be achieved. For a selected TWIP steel, this study investigates the influence of grain size and nitrogen content on mechanical properties as a function of temperature. Temperature dependence of yield strength and influence of nitrogen on grain refinement are investigated respectively between alloys. The microstructural analysis contributes to a better understanding of the deformation mechanisms and their interaction in different states.