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Information × Registration Number 0221U100301, 0119U101185 , R & D reports Title Experimental study of technological modes of production and regeneration of railway wheels with a complex of optimal characteristics at different service conditions popup.stage_title Head Ostash Orest P., Доктор технічних наук Registration Date 04-01-2021 Organization Karpenko Physico-Mechanical Institute of NASU popup.description2  It is shown that the damage of wheel tread surface during contact-fatigue of the wheel-rail pair increases with strength (hardness) increasing, which is due to the high carbon content in the wheel steel. In this case, the damage is correlated with the cyclic fracture toughness of steel. On this basis, a new concept of wheel steels production is proposed. According to this concept the new steels with reduced carbon content are needed to increase the austenitization temperature (that reduce the tendency to martensitic transformation), as well as increase fatigue crack resistance (which determines crack formation on the tread surface). Evaluation of the chemical composition and structural-phase state influence of developed steels on their efficiency should be carried out on the basis of the proposed set of mechanical characteristics, in particular, diagrams of structural strength and operational reliability and also structural strength parameter of materials. It is established that complex alloyed steels with a combination of solid solution and precipitation hardening have the optimal combination of strength fatigue crack characteristics and wear and damage resistance. Steel with solid solution (~ 1% Si, ~ 1% Mn) and precipitation ([V‧N] = 0,0020… 0,0025%) hardening at reduced carbon content (0.52… 0.53%) is recommended for next industrial inspection. Product Description popup.authors Kulyk Volodymyr V Ostash Orest P Perehinetsʹ Volodymyr M Chepilʹ Roman V Shapovalov Heorhiy O popup.nrat_date 2021-01-04 Close