Journal
ACTA MATERIALIA
Volume 52, Issue 13, Pages 4055-4063Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2004.05.033
Keywords
phase-field method; Widmanstatten plates; diffusion; morphological instability
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A phase-field method, based on a Gibbs energy functional, is formulated for gamma --> alpha transformation in Fe-C. The derived phase-field model reproduces the following important types of phase transitions: from C diffusion controlled growth through Widmanstatten microstructures to massive growth without partitioning of C. Applying thermodynamic functions assessed by the Calphad technique and diffusional mobilities available in the literature, we study two-dimensional growth of ferrite side plates emanating from an austenite grain boundary. The morphology of the ferrite precipitates is defined by a highly anisotropic interfacial energy. As large values of anisotropy lead to an ill-posed phase-field equation we present a regularization method capable of circumvent non-differentiable domains of interfacial energy. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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