Investigation of the growth kinetics of γ→α in Fe–C–X alloys with a thick interface model

Perevoshchikova, Nataliya; Appolaire, Benoît; Teixeira, Julien; Aeby‐Gautier, Elisabeth; Denis, S.

doi:10.1016/j.commatsci.2013.09.047

Cited by 8 publications

(3 citation statements)

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“…In addition, Perevoshchikova et al [24] apply a model with ingredients similar to the QSI-model introduced by Buchmann and Rettenmayr [19] to investigate the growth kinetics of γ → α in Fe-C-X alloys and could explain different regimes during ferrite growth. These examples show that the QSI can be an excellent tool to describe the kinetics of diffusional phase transformations.…”

Section: Scope Of Application Of the Qsi Modelmentioning

confidence: 99%

“…Its roots can be found in the so-called continuous growth model of Aziz and Kaplan [1]. In this context, it is also worth mentioning that Perevoshchikova et al [24] recently developed a model based on a similar assumption with respect to the interfacial processes and obtained the kinetic transitions during the growth kinetics of the austenite-to-ferrite transformation in Fe-C-X alloys. This assumption is based on the thought experiment that the decrease in Gibbs energy due to the transformation is available for two processes which are treated independently.…”

Section: Introductionmentioning

confidence: 97%

“…This assumption is based on the thought experiment that the decrease in Gibbs energy due to the transformation is available for two processes which are treated independently. First, Gibbs energy is dissipated due to the migration of the interface, second by the so-called trans-interface diffusion, see also [1,2,22,24]. In one sense, it is a sharp interface model, as no interphase separates the two bulk phases at the transformation front.…”

Section: Introductionmentioning

confidence: 99%

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The kinetics of diffusive phase transformations in the light of trans-interface diffusion

Gamsjäger

Rettenmayr

2015

Philosophical Magazine

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A variety of models with detailed coupling of thermodynamics and kinetics at a migrating interface has been developed for simulating diffusive phase transformations. A classification of such models is possible by the way the processes associated with the migrating interface are treated. In case of sharp interface models, the interfacial processes are assumed to be fast enough to not influence overall phase transformation kinetics (i.e. local equilibrium holds), or an effective mobility is attributed to the interface, which is also known as mixed-mode approach. In case of models treating an interface with finite thickness, the kinetic processes inside the interface are described in detail. In this work, a quasi-sharp interface model is analysed using the thermodynamic extremal principle. By this procedure, the implicit assumptions behind the modelling approach are revealed, and the evolution equations are derived. By means of a thick interface model, the contact conditions at both sides of a migrating interface are calculated, and the driving forces for interface migration and trans-interface diffusion are obtained. Based on these driving forces, the quasi-sharp interface model is evaluated and an effective interface diffusion coefficient is calculated.

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Section: Scope Of Application Of the Qsi Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%