ABSTRACT By coupling annular electromagnetic stirring with intercooling, a uniform direct chill (UDC) casting process has been developed to achieve fine and uniform microstructure for the large-sized aluminium alloy billets. In this study, the solidification behaviour of Φ508 mm 7005 alloy during UDC casting process was investigated, and the effect of the processing parameters on the microstructures and segregation of the billets were examined. The results indicated that, the solidification structure could be remarkably refined in the UDC casting process, and subsurface segregation could be alleviated by adjusting the vertical position of the stirring coils.

中文翻译：

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均匀直接冷硬铸造控制大尺寸铝合金坯的显微组织和宏观偏析

摘要通过将环形电磁搅拌与中冷相结合，开发了一种均匀直冷 (UDC) 铸造工艺，以实现大尺寸铝合金坯料的精细和均匀的微观结构。在这项研究中，研究了 Φ508 mm 7005 合金在 UDC 铸造过程中的凝固行为，并检查了加工参数对钢坯显微组织和偏析的影响。结果表明，UDC铸造过程中凝固组织显着细化，通过调整搅拌盘管的垂直位置可以缓解次表面偏析。