Abstract
Here we study the elemental composition, phase state, and defect substructure of high-chromium steel 420 exposed to intense low-energy electron beam irradiation with three pulses of duration 50-200 μs on the SOLO setup and with three pulses of duration 450 μs on the COMPLEX setup at a beam energy density of 40-43 J/cm1. The research methods include scanning electron microscopy, transmission electron microscopy, and X-ray diffraction analysis. The study shows that electron beam irradiation with surface melting, irrespective of the pulse duration, dissolves the initial carbide phase M23C6 ((Cr, Fe)23C6) in steel 420, saturates its surface layer with Cr atoms, and forms submicron dendrite cells, nanosized Cr3C2 and FeCr precipitates, and martensite structure in the steel.
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