## 4 Discussion  
The results obtained by determining the hardened layer's thickness and the surface hardness after the MPT products of steel Cr15 allowed us to study the effects of MPT on the reliability of cutting tools made from hard alloy WC85 TiC6 Co9 and to determine the thickness of the hardened layer. The surface hardness after nitriding and bording indicates that the proposed methods for the surface hardening of alloy steels and hard alloys significantly increase the hardness of surface layers. This fact can significantly increase the service life of tools and machine parts.  
After MPT of steel Cr15, the microstructure of the alloy is improved. This effect increases the surface microhardness by 40-50% compared with baseline (2.4 GPa). The depth of the hardened layer is 0.08-0.10 mm.  
After the magnetic pulse treatment, the surface microhardness distribution of the investigated hard alloys WC92 Co8 and WC85 TiC6 Co9 relative to the untreated one increased to 17 GPa. The variation coefficient for the microhardness decreased from 0.13 to 0.06, and stability decreased from 0.48 to 0.27. The change in lattice parameters of Co and TiC after processing the alloy shows a reduction in the lattice parameter and distortion. It also confirms the deformation of the cobalt phase solid alloy, with an increase in the strength of the hard alloy. Stability of the cutting tool equipped with the inserts from WC92 Co8 and WC85 TiC6 Co9 processed by the MPT method, relatively unprocessed, increases by 1.8-2.0 times in the absence of cracking. Obtaining such data will increase the wear resistance of the tool by 2.5-3.0 times.  
It should be noted that an increase in the stability of the cutting properties of the hard alloy is associated with recrystallization, the release of the dispersed phase, and the homogenization of the cobalt phase under the influence of the pulsed magnetic field. The use of MPT increases the stresses transition intensity in the cobalt phase from a tensile to compressive one. It also increases the strength and stability of the tool's cutting properties.  
However, the effectiveness of the developed nitriding and bording technologies significantly reduces the duration of treatments with sufficient hardened layers. The microstructures of hardened layers confirm the classical diffusion of layers with distinct nitride, borde, and transition zones. On the other hand, the result removes the contradiction between the need to achieve high performance and productivity. The latter relates to the problem of improving the composition of the saturating medium and the technological conditions of hardening treatments. That is why the proposed methods of surface hardening are promising.  
Remarkably, the proposed method of nitriding based on the saturation of the surface of steel with atomic nitrogen from the dispersed medium in a closed container does not consider such an important fact as the processing of large-sized products. This result is due to the size of the container and the amount of saturated mixture. An increase in the size of the container can change the pressure in the inhomogeneity of the hardened layer. Therefore, this fact indicates the disadvantage of the proposed method. The direction of further research associated with its elimination should focus on developing the mixture's saturation capacity for large-sized products. This adaptation should make it possible to obtain a uniform hardened layer of the part regardless of size.