COMPOSITION OF SURFACE LAYERS OF CARBON STEEL DEPENDING ON ACCELERATING VOLTAGE PULSE Cr <sup>+</sup> ION RADIATION
The influence of the accelerating voltage of pulse irradiation (20, 30, 40 kV) with Cr <sup>+</sup> ions on the changes in the hardness and composition of the surface layers and the surface morphology of carbon steel St3 is studied. Reduction of maximal concentration of implanted chromium from 22 to 13 at.% with increasing accelerating voltage from 20 to 40 kV is discovered. Formation of Cr <sub>2</sub>O <sub>3</sub>, CrO <sub>2</sub>, CrO <sub>3</sub> and FeO, Fe <sub>2</sub>O <sub>3</sub> oxides in the surface layers is revealed. It is shown that the hardness of the 250 nm thick surface layer increases by 20 % after irradiation with an accelerating voltage of 20 kV.