脉冲电磁场下铝合金半连续铸造技术研究进展

利用脉冲电磁场引起的力效应、热效应及磁势能可显著改善铝合金半连续铸造组织性能,同时,脉冲电磁铸造技术在绿色生产、智能控制等方面紧密契合“低碳冶金”的国家战略要求。综述了脉冲电磁场在铸造晶粒细化、微观结构演变及析出物细化3方面的研究成果,分析了脉冲电磁场特性与材料相变的耦合机制,提出了脉冲电磁场控制凝固、析出相变组织的初步构想,以满足高性能铝合金的质量要求。着重介绍了基于理论指导开发的熔体表面脉冲电磁场技术及其在7XXX(φ203)、6XXX(φ380)、Al-Si(φ120)等多规格半连续铸造的工业实践,脉冲电磁场有望在今后铸造、热处理等多个冶金环节发挥更大作用。

Research progress of semi-continuous casting of aluminum alloy under pulsed electromagnetic field

The mechanical effect, thermal effect and magnetic potential energy induced by pulse electromagnetic field can significantly improve the microstructure and properties of aluminum alloy semicontinous casting. Meanwhile, pulse electromagnetic casting technology in green production, intelligent control and other aspects closely meet the national strategic requirements of “low-carbon metallurgy”. The research results of pulsed electromagnetic field in casting grain refinement, microstructure evolution and precipitate refinement were reviewed. The coupling mechanism between the properties of pulsed electromagnetic field and phase transformation of materials was analyzed, and a preliminary conception of controlling solidification and precipitation of phase transformation microstructure by pulsed electromagnetic field is put forward to meet the quality requirements of high quality aluminum alloy microstructure. The pulsed electromagnetic field technology of melt surface based on theory and its industrial practice in multi-gauge semi-continuous casting are introduced,such as 7XXX(φ203)、6XXX(φ380)、Al-Si(φ120). Pulsed electromagnetic field is expected to play a greater role in many metallurgical processes such as casting and thermal care in the future.