Application of the extended geb model to predict the shape and fraction evolution of ferrite as a function of the transformation temperature for a lean steel containing 1.9 W.T. % Mn

Application of the extended geb model to predict the shape and fraction evolution of ferrite as a function of the transformation temperature for a lean steel containing 1.9 W.T. % Mn

Conference paper (2015)

Research Group

Novel Aerospace Materials

Gibbs energy balance Solute drag Directional growth Isotropic growth

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Published Date

01-01-2015

Language

English

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Research Group

Novel Aerospace Materials

Abstract

In this work, the austenite-ferrite transformation in Fe-0.23C-1.86Mn alloy is studied by a 2-D model based on Gibbs-Energy-Balance considerations at the moving interface. Plate-lengthening, plate-thickening and isotropic growth are calculated. Growth with a plate-like morphology leads to the fastest reduction in Gibbs energy when the transformation takes place at 500°C and 600°C On the contrary, isotropic (i.e. spherical) growth is preferential at 650°C. The concept, stasis for thickening of single plate, is put forward. The conditions for the single bainitic sheaf stasis correspond nicely to the conditions for macroscopic stasis.

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