Gibbs energy minimisation model for the austenite-ferrite phase transformation in Fe-C-X-Y alloys

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters Pub Date : 2021-06-03 DOI:10.1080/09500839.2021.1909166

Alexandre Mathevon, M. Perez, V. Massardier, D. Fabrègue, P. Chantrenne, P. Rocabois

引用次数: 3

Abstract

ABSTRACT A new model has been developed to predict austenite ferrite transformation kinetics in steels. For each alloying element, the concentration profile is computed solving a unique diffusion equation (including the 2 phases and the interface). The interface is described assuming linear variation of chemical potentials, saving thus computational time. Interface motion is driven by the minimisation of Gibbs energy. The model naturally reproduces the transition between thermodynamic equilibria (Para equilibrium, Local equilibrium with negligible partitioning, Local equilibrium) during heating. The validity of the model for reverse transformation has been validated on ternary and quaternary systems Fe-C-(Mn-Si-Mo) on decarburisation experiments.

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Fe-C-X-Y合金奥氏体-铁素体相变的吉布斯能量最小化模型

摘要建立了一个预测钢中奥氏体-铁素体转变动力学的新模型。对于每个合金元素，通过求解唯一的扩散方程（包括两相和界面）来计算浓度分布。假设化学势的线性变化来描述界面，从而节省了计算时间。界面运动是由吉布斯能的最小化驱动的。该模型自然地再现了加热过程中热力学平衡（准平衡、可忽略分配的局部平衡、局部平衡）之间的转变。在Fe-C-（Mn-Si-Mo）三元系和四元系脱碳实验中验证了反变换模型的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Philosophical Magazine Letters 物理-物理：凝聚态物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Philosophical Magazine Letters is the rapid communications part of the highly respected Philosophical Magazine, which was first published in 1798. Its Editors consider for publication short and timely contributions in the field of condensed matter describing original results, theories and concepts relating to the structure and properties of crystalline materials, ceramics, polymers, glasses, amorphous films, composites and soft matter. Articles emphasizing experimental, theoretical and modelling studies on solids, especially those that interpret behaviour on a microscopic, atomic or electronic scale, are particularly appropriate. Manuscripts are considered on the strict condition that they have been submitted only to Philosophical Magazine Letters , that they have not been published already, and that they are not under consideration for publication elsewhere.