电磁场频率对电磁铸造4045合金微观组织的影响  

Effects of Frequency on Microstructure of 4045 Aluminum DC Casting under Electromagnetic Field

作　　者：李业欣[1] 崔建忠[1] 秦克[1] 

机构地区：[1]东北大学

出　　处：《特种铸造及有色合金》2005年第4期243-245,共3页Special Casting & Nonferrous Alloys

基　　金：国家重点基础研究发展规划资助项目

摘　　要：采用低频电磁半连续铸造技术制备40 45铝合金铸坯,比较了常规DC法与低频电磁铸造40 45铝合金圆锭(直径为10 0mm)微观组织的形貌。重点考察在10～5 0Hz范围内,不同的频率使电磁铸造40 45铝合金圆锭微观组织发生的变化。结果表明:电磁场频率显著影响合金凝固的微观组织,当频率由5 0Hz降低到15Hz时,微观组织分布趋于均匀,初晶αAl晶粒尺寸减小,二次枝晶臂减少,共晶Si形貌由条状变为点状,组织得到明显细化。The difference of microstructures of 4045 aluminum alloy ingots with 100 mm in diameter cast by DC and LFEC (low frequency electromagnetic casting) processes was compared.The effects of electromagnetic frequency,ranging in 10～50 Hz,on the microstructure of 4045 aluminum alloy castings were focused on.The results showed that electromagnetic frequency greatly affects the microstructure of as-cast ingot.Uniform microstructure can be obtained and primary α-Al grain size and secondary dendrite are reduced,and eutectic Si phase transformed from bar into point-like with the decrease of frequency from 50 Hz to 15 Hz.

关 键 词：电磁铸造 频率 4045铝硅合金 微观组织 

分 类 号：TG249[金属学及工艺—铸造]