电磁搅拌对功能材料凝固组织和心部缺陷的影响

Effects of Electromagnetic Stirring on Microstructure and Central Defects of Functional Material

摘要:

分别采用电磁搅拌和传统模铸工艺制备金基合金，研究了电磁场对金基合金显微组织和心部缺陷的影响，结果表明：采用电磁搅拌技术制备的金基合金其凝固组织的枝晶化程度明显降低，与此同时，消除了在传统模铸条件下金基合金铸锭心部所普遍出现的中心缩孔和缩松等缺陷，并对电磁搅拌作用下，金基合金凝固组织的细化和铸锭心部缺陷的消除机理进行了探讨。

Abstract:

Gold-based alloys were prepared by electromagnetic stirring and conventional die casting respectively. The effects of electromagnetic field on as-cast microstructure and central defects of gold-based alloy were investigated. The results show that the dendritic structure of the gold-based alloy billets prepared by electromagnetic stirring is more uniform and smaller than that by conventional casting, Meanwhile, Such defects as shrinkage cavity and porosity that frequently occur in the central region of gold-based alloy ingot produced by conventional die casting are eliminated. Moreover, the effects of electromagnetic stirring on the mechanism of refinement of the solidification structure and elimination of central defects were also discussed.