摘要
研究了电磁搅拌对Cu-10Fe合金铸锭的晶粒度、Fe枝晶、宏观偏析和性能的影响。结果表明,电磁搅拌可以进一步细化Cu-10Fe合金的晶粒度,并降低了其凝固时的过冷度,使合金在进入亚稳液态组元不混溶温度区域前形核生长成树枝晶Fe相,有效避免了球团状Fe相的生成;在搅拌电流为300 A时,枝晶Fe相被打碎,先凝固的Fe相在剧烈旋转搅拌的离心力作用下向铸锭的边部移动,造成显著的宏观偏析;电磁搅拌对Cu-10Fe合金铸锭的电导率没有显著的影响,但由于电磁搅拌对铸态Fe枝晶的破碎细化作用,对其力学性能有着显著的强化作用。但电磁搅拌电流不宜过大,在150 A时就可达到提高铸锭品质的目的。
Effects of the electromagnetic stirring(EMS) on the solidification microstructure and properties of the Cu-10 Fe alloy were investigated. The results indicate that the EMS can effectively refine the grain in Cu-10 Fe alloy and reduce the supercooling degree of melted alloy, resulting in the formation of dendritic Fe phase instead of spherical Fe phase before the alloy enters the immiscible temperature region of the metastable liquid components. When the EMS current is 300 A, the Fe dendrites are broken and the Fe phases solidified firstly are separated to ingot surface by centrifugal force of violent rotating and stirring, resulting in the significant macrosegregation. Moreover, EMS has little influence on the conductivity of Cu-Fe ingot in the range of 21.46~22.04 MS/m. However, the fragmentation and refinement of electromagnetic stirring is contributed to the strengthening of the mechanical properties of Cu-10 Fe alloy during drawing. In conclusion, the electromagnetic stirring current of Cu-10 Fe alloy should not be too large, and 150 A is a reasonable parameter to improve the Cu-10 Fe ingot quality.
作者
董彦非
石磊
刘力铭
Dong Yanfei;Shi Lei;Liu Liming(Test Center of Luoyang Bureau of Quality and Technology Supervision;School of Materials Science and Engineering,Luoyang Institute of Science and Technology)
出处
《特种铸造及有色合金》
CAS
北大核心
2021年第10期1234-1237,共4页
Special Casting & Nonferrous Alloys
基金
河南省高等学校重点科研项目(21B430011)。
关键词
电磁搅拌
CU-FE合金
凝固组织
Fe枝晶相
导电性能
Electromagnetic Stirring
Cu-Fe Alloy
Solidification Microstructure
Fe Dendrites
Conductivity
