Phase Field Modelling of Eutectoid Transformation in Fe - C Alloy System

G S, Bharathi Ganesh (2017) Phase Field Modelling of Eutectoid Transformation in Fe - C Alloy System. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

Eutectoid transformation in Fe-C steel is simulated using the multi-phase field method. The model considers diffusion of carbon along the phase boundaries. The lamellar spacing and growth velocity are estimated for different undercoolings and compared with results from the literature and theoretical results from analytical models. Our principal finding of this work is that growth rate of eutectoid transformation in the presence of diffusion along phase boundaries is higher than the values stated by previous phase field approaches. This growth mode therefore must be considered to be the dominating growth mode and it explains at least some of the differences between experiment and theory, where diffusion along phase boundary is excluded. The maximum growth rate and maximum rate of entropy production criteria for determining the critical interlamellar spacing have been derived in the context of carbon diffusion along the interface.

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