Polydimensional modelling of dendritic growth and microsegregation in multicomponent alloys

被引：52
作者：
Michelic, Sebastian C. [1 ]
Thuswaldner, Joerg M. [2 ]
Bernhard, Christian [1 ]
机构：
[1] Univ Min & Met Leoben, Chair Met, Christian Doppler Lab Met Fundamentals Continous, A-8700 Leoben, Austria
[2] Univ Leoben, Chair Math & Stat, A-8700 Leoben, Austria
来源：
ACTA MATERIALIA | 2010年 / 58卷 / 07期
关键词：
Cellular automaton; Microsegregation; Multicomponent solidification; CELLULAR-AUTOMATON MODEL; FRONT TRACKING TECHNIQUE; SOLIDIFICATION MICROSTRUCTURES; MATHEMATICAL-ANALYSIS; GRAIN STRUCTURES; SIMULATION; PREDICTION; CONVECTION; INTERFACE; STABILITY;
D O I：
10.1016/j.actamat.2010.01.010
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Various models for simulating dendritic solidification have been proposed in the past. However, those models based on cellular automata (adopting the virtual front-tracking (VFT) concept) are often only suitable for the consideration of one alloying element. As typical industrial alloys are constituted of numerous alloying elements, the application of these models to practical alloys is therefore rather limited. In order to overcome this drawback, a new, modified VFT model, which allows for the treatment of several alloying elements in the low Peclet number regime, is presented. By a new and effective approach, based on a functional extrapolation of the concentration gradient, we are able to study dendritic growth in multicomponent Fe-C-Si-Mn-P-S alloys. Comparisons with well-established analytical models confirm the correctness of the model; results for free and constrained dendritic growth effectively demonstrate the capabilities of this new model. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：2738 / 2751
页数：14
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