ANALYTICAL STUDIES OF CHANGES IN KINETICS OF PHASE TRANSFORMATIONS IN STEEL DEPENDING ON CHEMICAL COMPOSITION
DOI:
https://doi.org/10.34185/1991-7848.itmm.2023.01.009Keywords:
modeling, phase transformations, thermokinetic diagram, railway rail, bainite, 45ХГС, 60ХГСФ.Abstract
Based on research in recent years, it is known that the strength of pearlite rail steels has reached its limit. In addition, the increase in carbon content has a negative effect on the impact strength and weldability of rail materials. Therefore, there is a need to develop and use new steels with the formation of a structural component of bainite. Determination of the influence of basic chemical elements through the known TTT diagrams and the actual chemical composition on the formation of the structure with the subsequent construction of SST diagrams. The simulation results showed that when the CAD model of chemical compositions is heated at a rate of 30°С/min in steel, the polymorphic a→y transformation begins at a temperature of ~771°С (Ас1) and ends at ~829°С (Ас3). To build the SST, the CAD model was set to a temperature from which cooling to a temperature of 900°C was simulated.
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