Analysis of the <Emphasis Type="Italic">γ</Emphasis> → <Emphasis Type="Italic">α</Emphasis> transformation in a C-Mn steel by phase-field modeling |
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Authors: | M G Mecozzi J Sietsma S van der Zwaag M Apel P Schaffnit I Steinbach |
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Affiliation: | (1) the Netherlands Institute for Metals Research, Rotterdamseweg 137, 2628 AL Delft, The Netherlands;(2) the Department of Materials Science and Engineering, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands;(3) the Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS Delft, The Netherlands;(4) Access eV, Intzestasse 5, D-52072 Aachen, Germany |
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Abstract: | This article deals with the austenite (γ) decomposition to ferrite (α) during cooling of a 0.10 wt pct C-0.49 wt pct Mn steel. A phase-field model is used to simulate this transformation. The
model provides qualitative information on the microstructure that develops on cooling and quantitative data on both the ferrite
fraction formed and the carbon concentration profile in the remaining austenite. The initial austenitic microstructure and
the ferrite nucleation data, derived by metallographic examination and dilatometry, are set as input data of the model. The
interface mobility is used as a fitting parameter to optimize the agreement between the simulated and experimental ferrite-fraction
curve derived by dilatometry. A good agreement between the simulated α-γ microstructure and the actual α-pearlite microstructure observed after cooling is obtained. The derived carbon distribution in austenite during transformation
provides comprehension of the nature of the transformation with respect to the interface-controlled or diffusion-controlled
mode. It is found that, at the initial stage, the transformation is predominantly interface-controlled, but, gradually, a
shift toward diffusion control takes place to a degree that depends on cooling rate. |
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