Electron Beam Processing of Diffusion Boroaluminizing Layerson the Surface of Steel 5khnm

The hardening of the surface of samples made of die steel 5KhNM by a combined method is considered, which consists of sequential thermal-chemical treatment (TCT) followed by modification of the resulting diffu-sion layer using pulsed electron beam processing using an electron source with a plasma cathode based on a low-pressure arc discharge. Electron beam processing was carried out in the SOLO experimental installation, which is included in the list of unique electrophysical installations in Russia. The results of local structural-phase transformation of diffusion boroaluminizing layers due to high-speed heating by an electron beam of millisecond duration are presented. A comparative analysis of the structure of the diffusion layer after thermal -chemical treatment and subsequent modification ofthe layer with a pulsed electron beam was carried out. Mi-crohardness was studied, and the phase state of the diffusion layer was assessed before and after electron beam exposure. Electron beam treatment (EBT) of the diffusion layer leads to an increase inmicro-hardness values, the maximum value of which reaches 1400 HV, and to a decrease in surface roughness values in the Raparam-eter (up to seven times). After electron beam treatment of the diffusion layer, the Fe2Bphase and intermetallic phases FeAl, Fe2AlCr, CrSi2are formed, which have high heat resistance, wear resistance and corrosion re-sistance.