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首页> 外文会议>TMS(The Minerals, Metals amp; Materials Society) Annual Meeting and Symposium on Solidification of Aluminum Alloys; 20040314-20040318; Charlotte,NC; US >Modelling of Microstructural Evolution in Bridgman Specimens
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Modelling of Microstructural Evolution in Bridgman Specimens

机译：Bridgman标本的微观结构演化建模

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摘要

A Bridgman furnace is used to investigate fundamental issues associated with solidification during DC casting (e.g. primary microstructure and secondary-phase selection). Thin, cylindrical specimens held in alumina sheaths are directionally solidified by their controlled removal from the furnace into a quenching water bath. Modelling and experiment are used to determine the microstructural evolution of Al-Mg alloys inoculated with TiB_2. Cellular-automaton finite-element (CA-FE) modelling is used to predict primary microsturctures. Grain initiation is assumed to be governed by the free-growth criterion, rather than by nucleation itself; grain growth is modelled according to the KGT dendrite-tip model. This allows prediction of grain size and morphology as a function of pulling velocity and magnesium content. In addition, the evolution of the solid/liquid interface velocity and thermal gradient are modelled; the extent of steady-state solidification can thus be evaluated.
机译：使用Bridgman熔炉研究与DC铸造过程中的凝固相关的基本问题（例如主要微观结构和次要相选择）。通过将其从炉中受控移入淬火水浴中，可将定向固定在氧化铝护套中的薄圆柱样品定向凝固。通过建模和实验确定了接种TiB_2的Al-Mg合金的组织演变。元胞自动机有限元（CA-FE）建模用于预测主要的微观结构。假定晶粒的萌生是由自由生长的准则决定的，而不是由成核本身决定的。晶粒生长是根据KGT枝晶尖端模型进行建模的。这允许根据拉速和镁含量预测晶粒尺寸和形态。另外，对固/液界面速度和热梯度的演化进行了建模。因此可以评估稳态凝固的程度。

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