## 5 Conclusions  
The proposed method of surface hardening based on the MPT in its sufficient simplicity which allows to increase the surface microhardness of steel Cr15 by 40-50% was compared with baseline (2.4 GPa). As a result, the depth of the hardened layer of 0.08-0.10 mm was obtained. It has been shown that treatment with magnetic field pulses of tool carbide reduces heterogeneity and residual stress levels and eliminates structural defects. These facts positively affect the tool's further maintenance. A decrease in the variation coefficient for microhardness (from 0.13 to 0.06) and stability (from 0.48 to 0.27) are essential factors for the optimal choice of the MPT method. This effect indicates an increase in the stability of hard alloys' physical and mechanical properties. A distinctive feature of the cuttingtool equipped with inserts from WC92 Co8 and WC85 TiC6 Co9 alloys is the high resistance relative to the untreated WC92 Co8 higher by 183%, and WC85 TiC6 Co9--more than 200%. The proposed method improves the carbide cutting tool's reliability and stabilizes its physical and mechanical properties. For obtaining a hardened surface layer of alloyed steels, applying the nitriding method in the container using nanocrystalline powder is effective. Obtaining the depth of the nitrided layer to 0.3-0.5 mm (depending on the steel composition) with an increase in surface microhardness to 12.7 GPa allows us to accelerate the processing by 10-fold compared to traditional gas nitriding. This ratio of the surface layer's hardness and its distribution on the steel depth increases the wear resistance of machine parts and tools by 120-177%, depending on the lightness. A distinctive feature of this method is the need for long-term aging in the furnace products, which does not lead to the decoupling of the steels' matrix. This feature of the method simplifies the process, which significantly reduces energy costs. This fact becomes possible due to the proposed method's nano-dispersed powder as a saturating medium. Confirmation of this fact can be found in the study of microstructures of the diffusion layer, which showed that the resulting nitrided layer is similar to the layers obtained in other nitriding types. The proposed method of boring can be implemented to strengthen the products and tools of complex shape, especially if they are after hardening treatment are not subjected to heat treatment, as the corrosion and deformation at these methods are minimal. For making this, it is necessary to use nano-dispersed boron-containing powder, which provides a surface hardness of alloyed steels of up to 21-23 GPa. Due to nano-dispersed powder, the boring process is accelerated by 2-3 times compared to existing technologies. Overall, this hardening characteristic allows us to increase the wear resistance of steels by 180-340%. Conceptualization, K.K. ; methodology, K.K., V.K. ([PERSON]) and M.S. ; software, V.I. and I.K. ; validation, I.P., V.K. ([PERSON]) and K.K. ; formal analysis, I.K. and M.S. ; investigation, K.K. ; resources, V.K. ([PERSON]) and I.P. ; data curation, V.K. ([PERSON]) and V.I. ; writing--original draft preparation, K.K. ; writing--review and editing, V.I. and I.P. ; visualization, V.K. ([PERSON]); supervision, V.I. and M.S. ; project administration, I.K. ; funding acquisition, I.K. All authors have read and agreed to the published version of the manuscript. This research was funded by the Slovak Research and Development Agency under contract No. APVV-16-0283. Project title: Research and development of multi-criteria diagnosis of production machinery and equipment based on the implementation of artificial intelligence methods. Not applicable. Some of the results were also obtained within the project \"Fulfillment of tasks of the perspective plan of development of a scientific direction \"Technical sciences\" Sumy State University\" funded by the Ministry of Education and Science of Ukraine (State reg. no. 0121U112684).