|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Computational Thermodynamics and Kinetics
||A Phase-field Study of Cascading Widmanstätten-ferrite Plates
||Avisor Bhattacharya, Kumar Ankit, Britta Nestler
|On-Site Speaker (Planned)
Quantitative phase-field simulation has significantly contributed towards better understanding of austenite to ferrite transformation . In the present study, we employ a multiphase-field model based on the grand chemical potential formulation [2,3] to simulate the morphological evolution of secondary widmanstätten ferrite during isothermal transformation. We add the stored-energy to the free-energy data taken from CALPHAD database to simulate realistic kinetics of the plates. By implementing a strong anisotropy in the interfacial-energy, we study the influence of supersaturation on the growth kinetics and stable morphologies of the single plate and colonies as proposed by theory. Finally, we also demonstrate the curvature-driven mechanism by which, a cascade of parallel `offspring’ plates form adjacent to the `parent’ plate.  A. Bhattacharya et al. Metall. Mater. Trans. A 46 (2) (2015) 926.  A. Choudhury et al. Phys. Rev. E 85 (2012) 021602.  K. Ankit et al. Acta Mater. 61 (2013) 4245.
||Planned: A print-only volume