Abstract
The paper considers the effect of vibration exposure on changes in the structure of 30KhGSNMA steel after steel treatment by vibration during primary crystallization. Studies have shown that after vibration exposure under certain modes, the contamination index decreases, the grain score decreases, the structure becomes more homogeneous. The second part of the work is devoted to the study of the possibility of using normalization as a replacement for the improvement of 30KhGSNM steel subjected to vibration during primary crystallization. Melt samples of 30KhGSNM steel were subjected to vibration and then heat treatment, which consisted of normalization under different modes. At the end of the heat treatment, the hardness, tensile strength, and impact strength were evaluated. The microstructure of the samples was also studied using the Thixomet Pro software. The analysis showed that, depending on the cooling medium, the dispersion of perlite changes during normalization, which affects the hardness. Based on the studies carried out, it was concluded that for steel subjected to vibration during the primary solidification process, it is possible to use normalization with air-water cooling instead of improvement. The properties of the prototypes are comparable to those after improvement