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Quantitative Phase-Field Modeling of the Ferrite-to-Austenite Transformation

S.Y. PAN, M.F. ZHU, B.W. KRAKAUER

Abstract


A quantitative phase-field model is developed to simulate the ferrite-to-austenite phase transformation. The proposed model can be reduced to the mixed-mode model for solid-solid phase transition in a sharp-interface limit or thin-interface limit. The matched asymptotic expansion for the phase-field equations is performed at the second order with a small parameter. An anti-trapping current, suitable for two-sided diffusion, is introduced in the solute conservation equation to eliminate anomalous interface stretching and surface diffusion effects due to unequal diffusivities in both phases. Thus, the local equilibrium at the interface can be recovered. Data for model validation is presented.

Keywords


quantitative phase-field model; anti-trapping current; ferrite-toaustenite transformationText

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