电磁搅拌对弹簧钢60Si_2Mn凝固组织的影响  

Effects of Electromagnetic Stirring on Solidification Structure of Spring Steel Castings

作　　者：赵爱民[1] 毛卫民[1] 崔成林[1] 李彦军[1] 钟雪友[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2000年第2期134-137,共4页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金!59995440

摘　　要：利用金相观察了电磁搅拌对弹簧钢６０Ｓｉ２Ｍｎ凝固组织的影响情况，并讨论了形成机制． 结果表明：在凝固过程中进行电磁搅拌，引起熔体的强烈流动，使液相区的温度场和溶质含量 趋于均匀；凝固时奥氏体的一次臂生长速度减慢，消除弹簧钢６０Ｓｉ２Ｍｎ一次结晶组织中发达的 柱状树枝晶层；而且随着搅拌功率的加大，弹簧钢一次结晶奥氏体的粒化或非枝晶化（ｎｏｎｄｅｎ一 ｄｒｉｔｅ）程度提高：电磁搅拌使弹簧钢凝固的晶核增多，一次结晶组织得到细化．The influence of electromagnetic stirring on the solidification structures of the spring steel castings or ingots has been investigated. The experiments have shown that the large columnar dendric austenitie formed in a conventional unstirred castings can be substituted by fine equiaxed grains or dedendric grains when stirred with electromagnetic field for a short time. The higher stirring power, the more spherical or dedendritic the austenite was obtained. The amount of austenite nucleation increased and austenite grain become finer in stirring castings.

关 键 词：电磁搅拌 60SI2MN 凝固组织 弹簧钢 半固态成形 

分 类 号：TG142.41[一般工业技术—材料科学与工程]