螺旋磁场下Pb-Sn合金凝固过程的数值模拟与实验研究  

Numerical Simulation and Experimental Study on Solidification Process of Pb-Sn Alloy under Spiral Magnetic Field

作　　者：赵倩[1] 张兴国[1] 张环月[1] 邓亮[1] 郭建设[1] 侯晓光[2] 房灿峰[1] 

机构地区：[1]大连理工大学,辽宁大连116023 [2]宝山钢铁公司,上海201900

出　　处：《稀有金属材料与工程》2014年第10期2389-2394,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50875031);宝钢高新技术项目(10K029ECES)

摘　　要：通过数值模拟和实验研究,分析了施加不同励磁电流螺旋磁场时Pb-Sn合金的凝固过程。结果表明：随着励磁电流的增加,冷却速率逐渐降低,熔体内的温度梯度变小,促进晶粒等轴化;轴向分力使熔体沿轴向的环流增强,初生β相趋于弥散分布,宏观偏析基本消除。但大电流产生强烈的搅拌,增加了晶粒之间摩擦与碰撞几率,晶粒聚集程度提高,强烈的感应加热也延缓熔体的冷却速度,导致晶粒粗化。在频率为10 Hz条件下,适宜的励磁电流是100~125 A。Numerical simulation and experimental studies were used to analyze the effect of spiral magnetic field with different exciting currents on the solidification process of the Pb-Sn alloy.The results show that with the increase of exciting current the spiral magnetic field can reduce the cooling rate and temperature gradient of molten metal,and facilitate the transition from columnar to equiaxed structure.The axial component of the force can enhance the circulation of the melt along the axial direction,which can promote dispersive distribution of the primary β phase and eliminate the macro-segregation.However,the strong stirring at large current increases the collision probability between the grains and the grains aggregate more easily while the increasing induction heat also delays the cooling rate of the molten metal,and then the size of grains becomes bigger.At f=10 Hz,there is a suitable range of exciting current within 100~125 A for refining grains and improving the macro-segregation.

关 键 词：PROCAST软件 螺旋磁场 宏观偏析 温度场 

分 类 号：TG146.12[一般工业技术—材料科学与工程]