Electromagnetic stirring with alternating current during electroslag remelting
Electromagnetic stirring with alternating current during electroslag remelting
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DOI：
10.1007/bf02654251
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发表时间：
1990-08
期刊：
影响因子：
--
通讯作者：
A. Mitchell;B. Hernández-Morales
中科院分区：
文献类型：
--
作者：
A. Mitchell;B. Hernández-Morales
设计并建造了一套交流电磁搅拌装置，用于在实验室电渣重熔炉上生产直径为150 mm的钢锭。采用4340合金钢和INCONEL 718合金作为电极材料进行了实验室规模的实验。搅拌的开始伴随着一条薄的偏析材料，并有利于形成点偏析。在凝固前沿之前的液池中的流体流动条件中产生的变化导致从高度定向的柱状结构转变为无定向的分支结构。除了小的分离液体袋，熔融金属流不会渗透到糊状区。电极材料和熔池形状对促进等轴组织的程度起重要作用。
An alternating current (AC)-operated electromagnetic stirring (EMS) device, using line frequency, was designed and built to operate on a laboratory electroslag remelting (ESR) furnace for 150-mm-diameter ingots. Laboratory-scale experiments were conducted employing both 4340 alloy steel and INCONEL 718 alloy as electrode material. The initiation of stirring is accompanied by a thin strip of segregated material and favors the formation of spot segregation. Changes produced in the fluid flow conditions in the liquid pool ahead of the solidification front result in a transition from a highly directional columnar to an unoriented, branched structure. Except for small pockets of segregated liquid, the flow of molten metal does not penetrate into the mushy zone. Both electrode material and molten metal pool shape play an important role on the extent of promoting an equiaxed structure.