Atomic mobilities, uphill diffusion and proeutectic ferrite growth in Fe-Mn-C alloys

被引：63

作者：

Liu, Yajun ^{[1
]}

Zhang, Lijun ^{[2
]}

Du, Yong ^{[2
]}

Yu, Di ^{[3
]}

Liang, Dong ^{[4
]}

机构：

[1] Montana State Univ, Western Transportat Inst, Bozeman, MT 59715 USA

[2] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China

[3] Amer Water Chem Inc, Tampa, FL 33619 USA

[4] DNV Columbus, Dublin, OH 43017 USA

来源：

CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY | 2009年 / 33卷 / 03期

关键词：

CALPHAD; Mobility; Diffusion; Fe-Mn-C; DICTRA; THERMODYNAMIC ASSESSMENT; LOCAL EQUILIBRIUM; SELF-DIFFUSION; NI ALLOYS; AL-FE; CARBON; PHASE; AUSTENITE; MANGANESE; PARAEQUILIBRIUM;

D O I：

10.1016/j.calphad.2009.07.002

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Following the treatment in CALPHAD, experimental data on diffusivities in Fe-Mn and Fe-C binary systems are critically evaluated with the DICTRA software to derive atomic mobilities. The effect of magnetic ordering on diffusion in bcc phase is taken into account, and the obtained atomic mobilities are expressed as functions of temperature and compositions with the Redlick-Kister polynomials. Based on the mobility parameters obtained in this work for the end-members and the interaction terms, comprehensive comparisons between the calculated and experimentally measured quantities are made. Due to the lack of experimental diffusivities for the ternary system, extrapolation based on binary information is performed, the results of which are used to study uphill diffusion of C in fcc Fe-Mn-C alloys. Such C diffusion against its own concentration gradient is a common occurrence for ternary systems containing one interstitial element, provided that the initial alloy compositions of diffusion couples are well chosen. In addition, the operating tie line evolution for proeutectic ferrite growth is also investigated, where C diffusion-controlled fast and Mn diffusion-controlled slow growths are discussed. Published by Elsevier Ltd

引用

页码：614 / 623

页数：10

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