低磁场性能优良的无取向电工钢生产方法

论述了无取向电工钢在低磁场下的应用，探讨了钢的成分、夹杂、组织及生产工艺对低磁场性能的影响。     

基于COMSOL铝电解电流分布在线监测的磁场分析

通过测量铝电解槽阳极电流产生的磁场来反映电流,并且使用屏蔽磁环屏蔽掉邻近的阳极、立柱母线、水平母线和跨接母线产生的干扰磁场。最后通过试验和COMSOL仿真,验证屏蔽磁环的可行性,实现电流分布连续监测。该测量方法简单,测量结果精确。     

Numerical Analysis of Fluctuation Behavior of Steel/Slag Interface in Continuous Casting Mold with Static Magnetic Field

Utilizing ANSYS CFX commercial software and volume fraction of fluid （VOF） model, fluctuation behav- ior of steel/slag interface was numerically simulated in continuous casting mold with static magnetic field, and the influence of metal jet characteristics on the behavior of steel/slag interface was investigated. The results indicated that the behavior of steel/slag interface is similar at different process parameters, which is closely related to the characteristic of the flow field. The steel/slag interface has an obvious trough characteristic, which can be divided in- to three zones： frontal valley zone, back valley zone and horizontal zone~ as the magnetic flux density increases, the fluctuation of liquid level increases firstly and then decreases, and a reasonable magnetic flux density can make steel/ slag interface obtain a relatively flat interface, which can prevent slag from being entrapped into liquid steel. For a thin slab continuous casting process, when the casting speed is 4 m/min, a reasonable magnetic flux density is about 0.5 T, and the interfacial fluctuation is weaker. No matter the position of magnetic field is horizontal or vertical, for different operating parameters, there is a corresponding reasonable magnetic field position where the steel/slag inter- face fluctuation can be properly controlled and slag entrapment can be prevented.     

行波磁场净化铝熔体中的感生电流分布

采用模拟实验，对行波磁场净化铝熔体技术中影响感生电流分布和大小的因素进行了研究。结果表明，沿着磁感应强度的方向，增加金属熔体流网络的层数对感生电流分布影响不大，而在垂直磁场方向上，金属熔体网络的跨度必须尽量大于行波磁场发生器的极距，才能保证熔体中感生电流分布更趋均匀。采用外推的方法推断出工业条件下(金属熔体流网络间距趋近于零，且磁感应强度为0．1T)铝熔体中的极限感生电流值。采用轨线模型计算表明，此时当铝熔体以2cm／s的流速在截面积为4mm^2的陶瓷管道中流过0．42m距离时，铝熔体中盲释10μm以上夹杂物可以全部去除.     

350kA预焙铝电解槽磁场优化对工艺技术指标的影响

介绍了350 kA预焙铝电解槽磁场优化对电解槽工艺参数、经济技术条件的影响情况。     

Morphology of the Cu‐rich Phase in Cu‐Pb Hypermonotectic Alloys under an Intense Magnetic Field

The solidification structure of a Cu‐80wt%Pb hypermonotectic alloy was investigated under four different experimental conditions. The results show that the spherical Cu‐rich phase in the matrix has three kinds of morphology, that is the larger “net‐shell type” and the smaller “egg‐type” or “eye‐type”. The cooling rate of the samples has a great effect on both macrostructure and microstructure. As the cooling rate becomes slow, the Cu‐rich phase changes from fine spheres to larger floating spheres and finally to coarse dendrites, and the thickness of the Cu‐shell and the net of Cu‐Pb phase in the Cu‐rich spheres become coarser. A magnetic field of 12 T has a remarkable effect: it restrains the gravity segregation of the Cu‐Pb alloy by preventing the floating of the larger Cu‐rich droplets and the sedimentation of the Pb‐matrix. Thus, the Cu‐Pb monotectic alloy exhibits a macrostructure and microstructure which are similar to those obtained at relatively fast cooling rates. The 12T magnetic field is supposed to restrain the collection of solute Cu extracted from the liquid Pb phase and the diffusion of solute Cu to the Cu‐shell in the centre of larger Cu‐rich droplets.