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Information × Registration Number 0224U032881, (0124U003037) , R & D reports Title The effect of structural and chemical heterogeneity on wear resistance and propagation of fatigue cracks at the wheel-rail contact point popup.stage_title Аналіз та дослідження впливу співвідношення твердості колеса та рейки різного хімічного складу на знос та впливу вихідного стану колеса (литі та суцільнокатані) 2колісної сталі на зносостійкість. Head Kononenko Hanna A., Доктор технічних наук Registration Date 10-12-2024 Organization Institute of Ferrous Metallurgy. ZI Nekrasov of the National Academy of Sciences of Ukraine popup.description1 Development of recommendations on the ratio and level of hardness in the wheel-rail contact based on the results of studies of structural changes during rolling wear and rolling-sliding to prevent the development of fatigue cracks and sudden failure during operation. popup.description2  As a result of the conducted research, the dependences of the mechanical properties of wheels and rails were established. It was shown that the surface hardness of railway wheels of the T brand, classes B and C, which are manufactured in accordance with DSTU GOST 10791:2016 and AAR M-107/M-208:2018, is close to the hardness of rails of categories R260Mn, R260, which are manufactured in accordance with the EN 13674:2016 standard, respectively, which are not heat-reduced, mainly this level of properties is associated with the presence of a larger amount of carbon. Taking into account the results of the dependence, it was established that the hardness of class C wheels is approximately at the same level with the bulk hardness of heatstrengthened rails of category II (DSTU 4344:2004). A comparative analysis of the strength and plastic characteristics of railway wheels and railway rails showed that the plasticity of railway rails is significantly lower, which is associated with the high carbon content and the presence of a thermal hardening process with the formation of a pearlite structure, while railway wheels have a predominantly ferrite-pearlite structure, which is more plastic. Product Description popup.authors Kononenko Hanna A. Podolskyi Rostyslav V. Safronova Olena А. popup.nrat_date 2024-12-10 Close