A Gibbs Energy Balance Model for Growth Via Diffusional Growth-Ledges

Clark, Samuel J.; Lan, Ya‐Qian; Rahnama, Alireza; Janík, Vít; Sridhar, Seetharaman

doi:10.2355/isijinternational.isijint-2018-621

Cited by 2 publications

(2 citation statements)

References 62 publications

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“…The interface to be considered in this paper has the width, thus the term "interface region" is used. In the literatures, [5][6][7][8][9][10][11] a triangular interaction potential well in the interface region is assumed. In the present model, triangular potential wells are adopted too.…”

Section: Activity Coefficient Distributionmentioning

confidence: 99%

“…The developed model is a non-steady state (time-dependent) one, which is an extension of the quasi-steady state model used for describing the solute drag effect in the γ to α transformation of Fe-C-X alloys by many authors. [5][6][7][8][9][10][11][12] A non-steady state (time-dependent) solute drag model was proposed by Murakami et al 13) to calculate the development of interface segregation during ferrite transformation. In their model the austenite/ferrite interface moving velocity is calculated from the growth rate of ferrite.…”

Section: Introductionmentioning

confidence: 99%

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A Non-steady State Model for the Austenite-to-ferrite Transformation Kinetics under the Non-partition Condition in Fe–C–Mn Alloys

Seki

Hayashi²,

Amino³

et al. 2019

ISIJ Int.

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A non-steady state model describing the transition from the para-equilibrium to the local equilibrium under the non-or negligible-partition condition is proposed to investigate the austenite to ferrite transformation kinetics in Fe-C-Mn steels. The present model has been developed based on the quasi-steady state model used for calculating the solute drag force by the segregated solute within the ferrite/austenite interface, although the solute-drag force is not calculated in the present model. The calculated Mn profiles are compared with the STEM-EELS observation reported previously by some of the present authors. The temporal evolution of the Mn profiles during PE to NPLE is shown. Combining a simple C diffusion model, the transition path from PE to NPLE on the C-Mn isothermal section of an Fe-C-Mn alloy is also presented.

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Section: Activity Coefficient Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Non-steady State Model for the Austenite-to-ferrite Transformation Kinetics under the Non-partition Condition in Fe–C–Mn Alloys

Seki

Hayashi²,

Amino³

et al. 2019

ISIJ Int.

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Kinetic Modeling of Grain Boundary Cementite Evolution

Vogric

Kozeschnik

Svoboda

et al. 2022

Metall Mater Trans A

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Prediction of grain boundary cementite growth kinetics in hypereutectoid steels is necessary to control its thickness. It is a question of major industrial importance but has remained unresolved to date. This paper presents and compares two different and new modeling approaches. The first one relies on diffusion-based nucleation and growth of cementite precipitates using a modified SFFK model with short-circuit grain boundary diffusion and accounting for heterogeneous nucleation site energy during isothermal treatments and continuous cooling. It is compared to previously published simulations of diffusion-controlled reaction with moving phase boundaries and a similar simulation using the software Dictra. The second approach implies that cementite thickening is driven by the nucleation of ledges at the stepped austenite/cementite interface, controlled by a structure barrier to ledge formation previously assumed in the literature.[1] We suggest a semi-empirical formulation of this barrier to ledge nucleation during isothermal transformation. Both approaches lead to an excellent match to experimental data for an almost pure Fe–C system. This implies that modeling the stepped structure of the austenite/cementite interface is not imperative for simulation of thickening kinetics, but also that understanding the governing physics of ledge formation allows for a comprehensive description of secondary cementite formation.

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A Gibbs Energy Balance Model for Growth Via Diffusional Growth-Ledges

Cited by 2 publications

References 62 publications

A Non-steady State Model for the Austenite-to-ferrite Transformation Kinetics under the Non-partition Condition in Fe–C–Mn Alloys

A Non-steady State Model for the Austenite-to-ferrite Transformation Kinetics under the Non-partition Condition in Fe–C–Mn Alloys

Kinetic Modeling of Grain Boundary Cementite Evolution

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