Competition between nucleation and early growth of ferrite from austenite - Studies using cellular automaton simulations
Competition between nucleation and early growth of ferrite from austenite - Studies using cellular automaton simulations
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DOI：
10.1016/s1359-6454(98)00243-2
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发表时间：
1998-11-02
期刊：
影响因子：
9.4
通讯作者：
Nair, PK
中科院分区：
文献类型：
--
作者：
Kumar, M;Sasikumar, R;Nair, PK
提出了铁素体在奥氏体晶界上形核和这些晶核沿着晶界生长并进入晶粒的模型。基于此模型，采用元胞自动机算法和相应的转换规则，模拟了奥氏体分解为铁素体的过程。当在连续冷却条件下进行时，模拟给出了成核和早期生长之间的竞争，这决定了铁素体晶粒尺寸随冷却速率和奥氏体晶粒尺寸的变化。获得了铁素体晶粒数、铁素体晶粒尺寸和铁素体形成动力学随冷却速度和奥氏体晶粒尺寸的变化关系。不同时间单元中铁素体体积分数的等值线图使铁素体生长过程可视化。(C)1998年冶金学报由爱思唯尔科技有限公司出版。保留所有权利。
A model for the nucleation of ferrite on austenite grain boundaries and the growth of these nuclei along the grain boundary and into the grain, is developed. A cellular automaton algorithm, with transformation rules based on this model, is used to simulate the decomposition of austenite into ferrite. When performed under continuous cooling conditions, the simulations give an insight into the competition between nucleation and early growth, which determines the variation of ferrite grain size with the cooling rate and with austenite grain size. The number of ferrite grains per austenite grain, ferrite grain size and the kinetics of ferrite formation are obtained as a function of the cooling rate and austenite grain size. Contour plots of the volume fraction of ferrite in the cells at different times, enables visualization of the ferrite growth process. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.