In order to deeply understand the growth of lamellar pearlite in U75V rail steels,the microstructures in U75V rail steels were studied simulatively by means of the phase-field method together with the COMSOL software,while the effect of cooling rates on the interlamellar spacing of pearlite was discussed.And then the simulated microstrutures were compared to the actual microstructures in U75V steels and analyzed.The analytical results showed that the average lamella spacing of lamellar pearlite obtained by phase-field simulation at two different cooling rates of 0.8℃/s and 2.3℃/s was 0.24 μm and 0.18 μm respectively.In addition,based on contrastive analysis over actual microstructures in U75V steels and simulated microstructures obtained by phase-field method,it was found that the simulated results were basically consistent with the measured values,which demonstrated that the established phase-field model and the selected physical parameters were in line with the actual situation.
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