The hardness of a material is determined both by the presence of hard particles (and their properties, dimensions, distribution, etc.) and by the voltage state due to the decay of austenite into martensite (formation of tetragonal martensite with a certain degree of tetragonality). Increasing hardness blocks the movement of Bloch walls and limits their movement to a small distance, and therefore for harder structures the intensity of Barkhausen noise is less than for structures with less hardness. This research work has been supported by the Cultural and Educational Grant Agency of the Slovak Republic (KEGA), project No. 003TnUAD-4/2022 “Simulations of basic and specific experiments of polymers and composites based on experimental data in order to create a virtual computational-experimental laboratory for mechanical testing”.