ELECTRON MICROSCOPIC ANALYSIS OF THE TRANSITION ZONE OF THE PLASMA COATING ‒ SUBSTRATE SYSTEM

Le résumé fourni par la source

Using plasma surfacing technology in a protective nitrogen alloy environment, a coating of approximately 9 ‒ 10 mm thick was applied to 30HGSA steel with a Mo ‒ Cr ‒ Co ‒ C powder wire. The structural and phase state and elemental composition of the contact transition zone of a plasma coating system (high-speed molybdenum steel) "substrate (medium carbon steel)" subjected to electron beam treatment have been studied by methods of modern physical materials science. The energy density of the electron beam is 30 J/cm 2 , the pulse duration of the electron beam is 50 μs, the number of irradiation pulses is 10, and the pulse repetition rate is 0.3 s 1 (specify the units of measurement). It has been established that the formation of the coating is accompanied by the creation of an extended transition layer with a thickness of about 100 μs, which contains an α-phase, a γ-phase, and carbides of complex composition. It has been established that the transition layer after irradiation contains microcraters and microcracks, crushing it into sections of various sizes. After irradiation, a lamellar structure containing Me 6 C carbide cementite particles was revealed in the volume of the transition layer. X-ray diffraction analysis showed that the contact zone directly adjacent to the coating contains grains of residual austenite reinforced with nanoscale Me 6 C carbides.

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