Browsing by Author "Efremenko, Vasiliy G."

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    Plasma Case Hardening of Wear-Resistant High-Chromium Cast Iron
    (Springer New York Consultants Bureau, 2017) Efremenko, Vasiliy G.; Chabak, Yu. G.; Karantzalis, A. E.; Lekatou, A.; Vakulenko, Ihor A.; Mazur, V. A.; Fedun, V. I.
    EN: The effect of plasma parameters on the case hardening of wear-resistant high-chromium cast iron in different structural condition is studied. Correlation relations were established between the initial and finite microstructure of the surface layer formed after plasma hardening at different heating rates. Microhardness profiles over the cross-section of the modified layer are structurally substantiated. Recommendations for optimizing the complex bulk-surface cast iron treatment conditions are given.
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    Use of Electric Pulse Treatment for Relaxation Internal Stresess
    (DIA Ltd, Kyiv, 2017) Vakulenko, Ihor A.; Plitchenko, Sergey; Sokirko, V. A.; Nadegdin, Yurii L.; Efremenko, Vasiliy G.
    EN: The article deals with explanation of the effect redistribution of residual stresses after processing electrical pulses based on aluminum alloy after welding. The results indicate quite significant influence of electrical pulse treatment on both the morphology of alloy structural components and the relation of chemical elements involved in the formation of certain phases alloy. After the welding alloy had the majority of the signs of the cast condition with characteristic plate forms of the eutectic components. The use of EP has led to the quite significant qualitative changes in the internal structure. The globular structures formation indicates a high degree of EP influence on the development of structural change processes. Studying the chemical composition of the phase components was found out that the observed structural changes of alloy as a result of EP first of all may be caused by the redistribution of chemical elements, which form the compounds themselves. After the EP of the welded joint, the alloy hardness increase is accompanied by the decrease in the number of crystal structure defects and coarsening of the coherent scattering regions.