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首页> 外文会议>2006 BIMW >Effect of Low Frequency Electromagnetic Field on Microstructures and Macro-segregation of Direct Chill Casting AI-19.2Si Alloys
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Effect of Low Frequency Electromagnetic Field on Microstructures and Macro-segregation of Direct Chill Casting AI-19.2Si Alloys

机译：低频电磁场对直接冷铸AI-19.2％Si合金的组织和宏观偏析的影响

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The influences of low frequency electromagnetic field on microstructures and macro-segregation in direct chill casting process were investigated in the experiments, Al-19.2%Si alloys were semi-continuously cast into ingots with 100 mm in diameter. Microstructures and macrostructures of samples taken from different part of the cast with different electromagnetic field conditions were characterized by optical microscopy. The results showed that low frequency electromagnetic field refines the microstructures and reduces macro-segregation. Unlike casting without electromagnetic field, the primary Si grains were homogeneous with fine dimensions and the morphology of the primary silicon exhibited small blocky structures or near-spherical structures. Further more, decreasing frequency is beneficial to the improvement. In the range conditions in the experiments, the optimum frequency is found to be 15Hz. During casting, the temperature of the liquid metal in the sump was monitored. The results shown, under LFEC the width of the liquid-solid region became narrowed and the temperature field in the sump also became homogeneous.
机译：实验研究了低频电磁场对直接冷铸过程中组织和宏观偏析的影响，将Al-19.2％Si合金半连续铸成直径为100 mm的铸锭。通过光学显微镜对在不同电磁场条件下从铸件的不同部位获取的样品的微观结构和宏观结构进行了表征。结果表明，低频电磁场改善了微观结构，减少了宏观偏析。与没有电磁场的铸造不同，原始硅晶粒均匀且尺寸精细，原始硅的形态表现出小的块状结构或接近球形的结构。此外，降低频率有利于改进。在实验的范围条件下，发现最佳频率为15Hz。在铸造期间，监测贮槽中的液态金属的温度。结果表明，在LFEC下，液固区的宽度变窄，集液槽中的温度场也变得均匀。

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