Evaluation of Permeability of Interdendritic Channels for Al-Cu and Sn-Pb Alloys

机译：Al-Cu和Sn-Pb合金枝晶间通道的渗透性评估

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A particularly important defect related with solute segregation during solidification is the microporosity, which influences mechanical properties of castings. Considering only the formation of porosity due to shrinkage, during directional solidification, it is necessary a flow of liquid metal into the interdendritic channels to compensate for metal contraction, and pores are formed when the pressure drop in the liquid flow at a point within the mushy zone exceeds the pressure acting at this point. The increase in roughness of the interdendritic channels, caused by the successive ramification of the dendrite arms promotes a pressure drop inside the channel. In this paper a model developed by the authors is used to predict the permeability in directional solidification of Al-Cu and Sn-Pb alloys. From comparisons with experimental results models were choose to estimate primary and secondary dendrite arms spacing and applied to calculate the variation of permeability in directional solidification. From these results, applying a numerical method the pressure drop in the interdendritic channels was determined for the different alloys to analyze the influence of the composition of the alloy in the possibility of pore formation.

机译：与凝固过程中溶质偏析有关的一个特别重要的缺陷是微孔，它会影响铸件的机械性能。仅考虑由收缩引起的孔隙的形成，在定向凝固过程中，有必要使液态金属流入树突间通道以补偿金属收缩，并且当在糊状液中某一点的液体流中的压力下降时会形成孔。区域超过此时的压力。由树枝状臂的连续分枝引起的树突间通道的粗糙度增加促进了通道内部的压降。在本文中，作者开发的模型用于预测Al-Cu和Sn-Pb合金定向凝固中的渗透率。通过与实验结果的比较，选择模型来估计初级和次级枝晶臂间距，并用于计算定向凝固中渗透率的变化。根据这些结果，采用数值方法确定了不同合金在枝晶间通道中的压降，以分析合金组成对孔形成可能性的影响。

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《International Conference on Solidification and Gravity; 20040906-09; Miskolc-Lillafured(HU)》|2004年|P.251-256|共6页
会议地点 Miskolc-Lillafured(HU)
作者
M. L. N. M. Melo; R. G. Santos;
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作者单位

PPGECM, USF, 13251-900 Itatiba-SP, Brazil;

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会议组织
原文格式 PDF
正文语种 eng
中图分类工程材料一般性问题;
关键词
permeability; solidification; microstructure;

机译：渗透性凝固显微组织;

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1. Permeability assessment by 3D interdendritic flow simulations on microtomography mappings of Al-Cu alloys [J] . D. Bernard, O. Nielsen, L. Salvo Materials Science and Engineering. A, Structural Materials . 2005,第1a2期

机译：在Al-Cu合金的显微断层图上通过3D树突间流动模拟进行渗透性评估
2. Permeability of interdendritic channels [J] . R.G. Santos, M.L.N.M. Melo Materials Science and Engineering. A, Structural Materials . 2005,第1a2期

机译：树突间通道的渗透性
3. The effect of solidification variables on tertiary dendrite arm spacing in unsteady-state directional solidification of Sn-Pb and Al-Cu alloys [J] . Fernando Sa, Otavio Lima Rocha, Claudio Alves Siqueira, Materials Science and Engineering. A, Structural Materials . 2004,第1a2期

机译：Sn-Pb和Al-Cu合金非稳态定向凝固过程中凝固变量对第三枝晶臂间距的影响
4. Evaluation of Permeability of Interdendritic Channels for Al-Cu and Sn-Pb Alloys [C] . M. L. N. M. Melo, R. G. Santos International Conference on Solidification and Gravity . 2006

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机译：在Sn-Pb和Al-Cu合金的不稳定状态凝固过程中影响树突间距的热流参数

Evaluation of Permeability of Interdendritic Channels for Al-Cu and Sn-Pb Alloys

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