GH4698合金真空电弧重熔过程中熔池流动形态  

Molten Pool Flow Morphology During Vacuum Arc Remelting Process for GHGH4698 Alloy

作　　者：昝磊 罗德焓 李映 张健 于要伟 Zan Lei;Luo Dehan;Li Ying;Zhang Jian;Yu Yaowei(State Key Laboratory of Advanced Special Steel,Shanghai Key Laboratory of Advanced Ferrometallurgy,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Chengdu Advanced Metal Materials Industry Technology Research Institute Co.,Ltd,Chengdu 610000,China)

机构地区：[1]上海大学材料科学与工程学院省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]成都先进金属材料产业技术研究院有限公司,四川成都610000

出　　处：《稀有金属材料与工程》2021年第4期1125-1131,共7页Rare Metal Materials and Engineering

基　　金：Program for Professor of Special Appointment(Eastern Scholar) at Shanghai Institutions of Higher Learning(TP2015039);National 111 project(17002)。

摘　　要：为了进一步了解真空电弧重熔(VAR)过程,利用开源CFD计算软件OpenFOAM,基于有限体积法(FVM)建立了包括电磁场、温度场和流场的二维多场耦合模型来研究宏观非稳态下GH4698镍基合金铸锭的凝固过程。结果表明,从坩埚流向自耗电极的电流所引发的磁场主要集中在铸锭的上部,并沿铸锭轴线旋转。磁感应强度由铸锭中心向边缘呈现先增大后减小的趋势,并在电极边缘处达到最大值。热浮力和洛伦兹力是熔池内的主要驱动力,并且它们对熔池流动的影响正好相反。In order to further understand the vacuum arc remelting(VAR) process, with the help of Open FOAM and an open source CFD computing software, a two-dimensional multi-physical finite volume model(FVM) including electromagnetic field, temperature field and flow field was established to study the macroscopic phenomenon of the unsteady solidification process for GH4698 nickelbased super alloy ingots. Results show that magnetic induction intensity induced by the current flowing from the crucible to the consumable electrode is mainly concentrated on the upper part of the ingot and rotates along the axis of the ingot. The magnetic induction intensity first increases and then decreases from the center to the edge of the ingot, and reaches the maximum value at the edge of the electrode. Thermal buoyancy and Lorentz forces are the main driving forces in the molten pool and their effect on the flow of molten pool is opposite.

关 键 词：真空电弧炉 有限体积模型 电磁场 流场 

分 类 号：TG24[金属学及工艺—铸造]