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首页> 外文会议>TMS annual meeting exhibition >A NUMERICAL BENCHMARK ON THE PREDICTION OF MACROSEGREGATION IN BINARY ALLOYS
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A NUMERICAL BENCHMARK ON THE PREDICTION OF MACROSEGREGATION IN BINARY ALLOYS

机译：二元合金宏观偏析预测的数值基准

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During the solidification of metal alloys, chemical heterogeneities at the product scale (macrosegregation) develop. Numerical simulation tools are beginning to appear in the industry, however their predictive capabilities are still limited. We present a numerical benchmark exercise treating the performance of models in the prediction of macrosegregation. In a first stage we defined a "minimal" (i.e. maximally simplified) solidification model, describing the coupling of the solidification of a binary alloy and of the transport phenomena (heat, solute transport and fluid flow) that lead to macrosegregation in a fully columnar ingot with a fixed solid phase. This model is solved by four different numerical codes, employing different numerical methods (FVM and FEM) and various solution schemes. We compare the predictions of the evolution of macrosegregation in a small (10×6 cm) ingot of Sn-10wt%Pb alloys. Further, we present the sensitivities concerning the prediction of instabilities leading to banded channel mesosegregations.
机译：在金属合金的固化过程中，产品规模的化学异质性（宏观聚集）不断发展。数值模拟工具已开始在行业中出现，但是其预测能力仍然有限。我们提出了一种数值基准测试，用于处理模型在宏观偏析预测中的性能。在第一步中，我们定义了“最小”（即最大程度简化）的凝固模型，该模型描述了二元合金的凝固与导致全柱状宏观偏析的传输现象（热，溶质传输和流体流动）的耦合。具有固定固相的晶锭。该模型由四个不同的数字代码解决，采用了不同的数字方法（FVM和FEM）和各种解决方案。我们比较了Sn-10wt％Pb合金小（10×6 cm）铸锭中宏观偏析的预测。此外，我们提出了与导致带状通道介导聚集的不稳定性预测有关的敏感性。

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