An assessment of interfacial dissipation effects at reconstructive ferrite-austenite interfaces

In support of accurate prediction of carbon content in austenite for control of austenite mechanical stability in “triple-phase” steels, paraequilibrium growth simulations with the DICTRA software were used to predict the carbon concentration profile at the ferrite-austenite interface during rapid cooling from an intercritical annealing temperature. A mobility model developed from previous literature data was used to estimate a temperature dependent interfacial dissipation energy function. Addition of the interfacial dissipation energy to the ferrite free energy lowers the austenite carbon content near the interface to levels consistent with experimental measurements of retained austenite average carbon content.