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On the formation of Widmanstdtten ferrite in binary Fe-C - phase-field approach
KTH, Superseded Departments, Mechanics.
KTH, Superseded Departments, Metallurgy.
2004 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 52, no 13, 4055-4063 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2004. Vol. 52, no 13, 4055-4063 p.
Keyword [en]
phase-field method, Widmanstatten plates, diffusion, morphological instability, simulations, diffusion, growth, alloys, solidification, transformation, interface, austenite, model
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-23626DOI: 10.1016/j.actamat.2004.05.033ISI: 000223091100030ScopusID: 2-s2.0-3042710965OAI: diva2:342325
QC 20100525 QC 20110926Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2011-09-26Bibliographically approved

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