This dissertation explores the microsegregation phenomenon in high manganese steel grades and the peritectic phase transformation using the phase-field method (PFM). Investigations into microsegregation involved multiple simulations under directional solidification conditions across varying cooling rates. The secondary dendrite arm spacing (SDAS) was calculated for each simulation, with results compared to an analytical model and experimental data from literature for various alloys. Frequency distributions of chemical composition were derived from 2-D phase-field simulations, literature experimental results for similar alloys, analytical models, and 1-D DICTRA® simulations. The comparison demonstrated that PFM provides a more accurate description of microsegregation than other methods. For the peritectic phase transformations, two numerical models were developed for isothermal and directional solidification conditions—one excluding elastic effects and the other incorporating elasticity. Both models simulated the two stages of the phase transformation: the peritectic reaction and transformation. Additionally, the kinetic aspects of phase transformation and the stress levels resulting from volume contraction during the transition from delta ferrite to gamma were investigated using the current model.
