摘要
采用CREM铸造工艺制备4045铝合金铸锭,在10Hz～50Hz范围内调整交变电流的频率,间隔为5Hz,通过光学显微镜观察电磁场频率对4045铝合金微观组织的影响。结果表明,电磁场频率对晶粒的细化有重要影响,在电磁场作用下,晶粒发生细化,晶粒尺寸趋向均匀,但是在不同电磁场频率的条件下得到了不同的细化组织,只有适当的电磁场频率才能得到最佳的细化效果,当频率为20Hz时,合金铸锭的微观组织为最佳,等轴晶数目最多,晶粒尺寸和分布均匀。
The relationship between electromagnetic frequency and the microstructure of 4045 aluminum alloys was observed with the optical microscope.4045 aluminum alloy ingots were cast by CREM(casting-refining-electromagnetic)process under the frequency range of 10～50 Hz.The results show that the electromagnetic frequency greatly influences the microstructure of alloy.Electromagnetic field can refine crystal grain,and make grain size tend to be uniform。However,the best refining structure will be gotten only if the f...
出处
《铸造技术》
CAS
北大核心
2009年第3期337-339,共3页
Foundry Technology
关键词
CREM法
微观组织
铝合金
电磁场频率
CREM process
Microstructure
Aluminum alloy
Electromagnetic frequency
