Study of correlation of chemical and phase composition and fracture toughness of railway wheel steel
摘要
The influence of the structural state on the set of properties of the railway wheel metal was studied. Correlation between metal characteristics was established. The negative impact of structural heterogeneity on the fracture toughness of KIC of carbon steel for railway wheels (C approx. 0.47 mass%) was established. The bainite in the steel structure in the amount of 10 to 15% leads to the decrease in the fracture toughness KIC by 25–36% in comparison with this characteristic for the steel with a uniform ferrite-pearlite structure (the increase in the amount of bainite in the structure on average by 1% causes the decrease in fracture toughness by 2.7%).