Microstructural pattern formation during eutectoid transformation in multicomponent steels

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The eutectoid transformation in steels has been the topic of many theoretical and experimental investigations ever since pearlite was first discovered in the 18th century. In view of establishing a synergy between theory and experiments, the phase-field method holds great promise in terms of its ability to describe the interface evolution at the mesoscale and diffusion time scale. In this project, we will couple the phase-field approach with CALPHAD to numerically investigate interesting 3-D microstructural patterns such as, divorced eutectoid and divergent pearlite in commercial steels. We also propose to investigate the mechanisms by which, pearlitic lamellae tilt as they cross grain boundaries. The primary objective of the research project is to advance the understanding of the complex evolution pathways during the eutectoid transformation, which has profound implications for the eventual optimization of the process control parameters related to heat treatment of multicomponent steels.