摘要
针对Al-Cu合金组织细化的问题,以Al-4.5%Cu为试验材料,采用控制变量法研究了旋转磁场激励电压、频率和换向时间对其凝固组织的影响。结果表明,旋转磁场对合金的凝固组织产生较明显的细化效果,使合金凝固组织中粗大的树枝晶破碎,呈现出近等轴晶颗粒,且分布也变得均匀。当激励电压超过60 V或换向时间超过60 s时,组织将变得粗大,当频率大于50 Hz时,组织变化不明显。较好的旋转磁场参数为激励电压为60 V、频率为25~50 Hz、换向时间为45~60 s。
For the refinement of Al-Cu alloy, taking the Al-4.5% Cu alloy as the experimental materials, the effects on the microstructure rotating magnetic field excitation voltage, frequency, and the reversing time were studied respectively by the controlling variable method. The experimental results show that the microstructure can be obviously refined and the dendrite grain can be broken into the uniform-distributed equiaxed grain by the rotating magnetic field. When the excitation voltage is over 60 V or the reversing is over 60 s, the microstructure will become coarse. When the frequency is more than 50 Hz, there is no obvious microstructure change. The optimal parameters of rotating magnetic field are that the excitation voltage is 60 V, the frequency is 25-50 Hz,and the reversing time is 45-60 s.
出处
《铸造》
CAS
CSCD
北大核心
2017年第3期238-241,共4页
Foundry
基金
黑龙江省教育厅科学研究项目(12541107)
