采用在常规结晶器上布置线圈而开发的低频电磁半连续铸造技术(LFEC)制备2524铝合金扁铸锭并系统研究其对微观组织和宏观偏析的影响。结果表明,采用低频电磁半连续铸造技术制备的扁铸锭具有更加细小、均匀的铸态组织,而且组织由枝晶和蔷薇型转变为等轴晶组织。低频电磁半连续铸造技术对铸锭宏观偏析具有重要的影响,施加磁场后铸锭中心部分的反偏析明显减弱了。同时,对这些作用的机理进行了探讨。 The low frequency electromagnetic semicontinuous casting (LFEC) developed by arranging coils on a conventional mold was used to prepare 2524 aluminum alloy flat ingot and its microstructure and macrosegregation were investigated systematically. The results show that the flat cast ingot prepared by low frequency electromagnetic semi - continuous casting technology has more fine and uniform as - cast structure, and the microstructure changes from dendrites and rosettes to equiaxed grains. Low-frequency electromagnetic semi-continuous casting technology has an important impact on macrosegregation of ingot. The reverse segregation in the central part of ingot after applying magnetic field is significantly weakened. At the same time, the mechanism of these effects is discussed.