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《Acta Metallrugica Sinica》 2004-02
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EFFECT OF MOULD MATERIALS ON THE AS-CAST MICROSTRUCTURES OF A SUPER-HIGH STRENGTH Al ALLOY CAST BY LOW FREQUENCY ELECTROMAGNETIC CASTING

DONG Jie, LIU Xiaotao, ZHAO Zhihao, BAO Weiping, CUI Jianzhong The Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004  
The effect of mould materials on the magnetic intensity in ingots was numerically simulated, then the magnetic intensities without ingots were measured, and some experiments were conducted to study these effects. The results show that during low frequency electromagnetic casting the mould with high electrical resistivity such as titanium alloy can greatly reduce eddy loss of mould, thus increase useful power. At the same condition, when the ingot was cast by titanium alloy mould (high electrical resistivity), the microstructures is uniform and fine, the average grain sizes at the border and center of the ingot are 24 μm and 27 μm respectively, but when the ingot was cast by aluminum alloy mould (low electrical resistivity), the microstructures of both the border and center of the ingot are coarse, their average sizes are 38 μm and 45 μm. Furthermore, the mould with higher electrical resistivity can increase the content of solute elements within grains.
【Fund】: 国家高技术研究发展规划资助项目2001AA332030
【CateGory Index】: TG27
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