AUTHORS: B.K. Rakhadilov, Y.Y. Tabiyeva, G.K. Uazyrkhanova, L.G. Zhurerova, D. Baizhan
PAGES: 167 - 173
This paper examines the influence of electrolyte-plasma surface hardening on the structure and microhardness of wheel steel mark 2. In the work electrolyte-plasma surface quenching was carried out in an electrolyte made from an aqueous solution of 10% carbamide (NH2)2CO+20% sodium carbonate Na2CO3. The work investigated the strength limit, fluidity and wear intensity of the wheeled steel after electrolyte-plasma surface quenching. After electrolytic-plasma surface quenching, a batch, high-temperature plate and low-temperature plate martensit is formed on the surface of the sample. Investigations have been carried out on microhardness determination on cross-section of wheel steel samples after quenching in aqueous solution of electrolyte. It is found that after electrolytic-plasma surface quenching, the microhardening values of this hardened surface layer increased on ~ 3 times compared to the steel matrix, and the thickness of the hardened layer is 1000-1500 μm. According to the results of the scanning transmission electron microscopy, the electrolyte-plasma surface quenching caused a change in the morphological constituents of steel mark 2. In the initial state, the matrix of steel is a alpha - phase, the morphological components of which are fragmented ferrite, unfragmented ferrite and pearlite.
electrolytic-plasma surface quenching, wheel steel, microhardness, morphology, martensite, transmission electron microscopy.
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