低频磁场对水平连铸2024铝合金微观组织的影响

研究了低频电磁水平连铸铝合金铸锭与普通水平连续铸造铝合金铸锭的铸态组织和宏观偏析情况.采用低频电磁水平连续铸造技术和普通水平连续铸造技术生产了2024变形铝合金铸锭,铸锭规格为40 mm×200 mm扁锭.对两种铸造方法得到的铝合金铸锭分别取样进行光学显微组织分析,并分别在横截面上取样进行化学分析.实验结果表明,低频电磁场可以显著地改善铸锭的微观组织,使铸锭的微观组织得到明显细化;低频电磁场还可以减少Cu元素在横截面上的宏观偏析,使Cu元素在横截面上的分布更加均匀.

Effects of Low-Frequency Electromagnetic Field on Microstructure and Macrosegregation of HDC Casting 2024 Aluminum Alloy

Investigates experimentally and comparatively the as-cast microstructure and Cu macrosegregation of 2024 Al alloy ingots by HDC (horizontal direct chill) continuous casting process in low-frequency electromagnetic field and those by conventional horizontal continuous casting process, where the cross-sectional area of specimens is 40 mm × 200 mm. The two different specimens were both inspected by optical microscopy and chemically analyzed sampling from their cross-sectional areas. The result showed that the low-frequency electromagnetic field can greatly improve the microstructure with grain refining, and reduce the Cu macrosegregation on cross-sectional area for uniform distribution.