OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 4 2024 Fig. 3. The structure of the composition after 80 % deformation after etching with a mixture of HNO3 and HCl acids in a ratio of 1:3 by volume, where 1 is the modifi ed layer, 2 is the base metal: a, b – the transverse section of the composition after rolling; c – the structure of the modifi ed layer, with isolated destroyed borides after plastic deformation; d – morphology of the side surface of the base material 0.12 C-18 Cr-9 Ni-Ti along the rolling direction a b c d In addition, when examining boride particles in the austenite matrix using X-ray spectral analysis of the modifi ed layer, high proportions of chromium in borides and iron with nickel in the matrix are recorded, this presumably indicates the diff usion of boron from borides into the matrix material (Figure 4). To evaluate the mechanical properties, the microhardness of the specimens was measured. The average microhardness of the modifi ed layer for specimens without deformation is 13 GPa, 12 GPa for of 30 % deformation, 11 GPa for 80 % deformation. The microhardness of chromium-nickel austenitic steel 0.12 C-18 Cr-9 Ni-Ti is 2.3 GPa. It can be noted that the greater the degree of deformation of the composition, the lower the microhardness values, which is explained by the crushing of high-strength particles and the formation of a grid of small cracks between it with a lack of matrix material between it. The phase composition of the specimens was determined using hard X-ray radiation with a wavelength of 1.783 Ǻ. Only diff raction peaks of austenite and complex borides (FexCry)B phases are observed on X-ray images (Figure 5). The analysis of X-ray images allows us to roughly analyze the defect of the structure by broadening the X-ray lines. The peaks widen with an increase in the degree of plastic deformation. In this
RkJQdWJsaXNoZXIy MTk0ODM1