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Influence of convection on the solidification behaviour during DC casting of a 5182 aluminium alloy

机译：对流对5182铝合金直流铸造过程中凝固行为的影响

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摘要

The influence of electromagnetic stirring and grain refinement on the solidification structure of the 5182 aluminum alloy is studied through thixo-casting of billets of 78 mm diameter with a casting speed of 3 mm/s. The effect of convective flow is studied through different electromagnetic stirring intensities. Grain refiner effect is also taken into account through the addition of Al-5Ti-1B. From the observation of the microstructure it is found that the grain density increases as the stirring intensity increases, with a much more pronounced effect in the case of the grain refined billets. Periodic columnar structures are observed mainly in the non grain refined billets. From thermal investigations, explanations of these observations are proposed which are based on the combination of the nucleation and fragmentation mechanisms and on the growth competition between columnar and equiaxed structures.
机译：研究了电磁搅拌和晶粒细化对5182铝合金凝固组织的影响，方法是通过直径为78 mm的方坯的触变性浇铸，铸造速度为3 mm / s。通过不同的电磁搅拌强度研究了对流流动的影响。通过添加Al-5Ti-1B也可以考虑晶粒细化剂的作用。从微观结构的观察发现，随着搅拌强度的增加，晶粒密度增加，在晶粒细化的坯料的情况下，效果更为明显。周期性的柱状结构主要在非晶粒精炼坯料中观察到。从热学研究中，提出了这些观察结果的解释，这些解释是基于成核和断裂机理的结合以及柱状结构和等轴结构之间的生长竞争。

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