Comparison Between Segregation of High-Manganese Steels from 2-D Phase-Field Simulations, 1-D Analytical Theories, and Solidification Experiments

摘要

This paper presents a study comparing the microsegregation from 2-D phase-field simulations with those predicted by 1-D analytical theories and with the ones obtained from experiments. It focuses mainly on the solidification of an Fe-Mn binary alloy with high manganese content (23 wt%), which is comparable to the manganese content of high-manganese steel (HMnS) grades. The main motivation for this study comes from the strong influence of microsegregation on the local mechanical properties of these steels at room temperature. After performing simulations with the model for different realistic cooling rates, the secondary dendrite arm spacings, which are strongly related to the microsegregation phenomenon, are determined and compared with an analytical model and also with experimental results from the literature for similar alloys. Analyses of concentration of the simulated samples, which are related with real microsegregation phenomenon, are also presented in this investigation using an area-based frequency distribution. The distribution results from simulations are also compared to the 1-D analytical Brody-Flemings model, to a DICTRA simulation, and to experimental results for a similar alloy. From this investigation, it is concluded that the concentration distribution for binary alloy simulations in 2-D agrees semi-quantitatively with the experimental results for ternary alloys.