真空感应熔炼中夹杂物运动行为数值模拟  

Numerical simulation of inclusions movement in vacuum induction melting

作　　者：王宁 高锦国[1] 杨曙磊 杨树峰[1] 刘猛 苏孺 WANG Ning;GAO Jin-guo;YANG Shu-lei;YANG Shu-feng;LIU Meng;SU Ru(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Technology Center,Zhonghangshangda Superalloys Co.,Ltd.,Xingtai 054800,Hebei,China;School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050000,Hebei,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]中航上大高温合金材料股份有限公司技术中心,河北邢台054800 [3]河北科技大学材料科学与工程学院,河北石家庄050000

出　　处：《中国冶金》2021年第12期20-26,共7页China Metallurgy

基　　金：河北省省级科技计划资助项目(20311007D);国家工信部工业强基工程资助项目(2018-130000-33-03-001517);2020年河北省重点研究资助项目(JMRH2020-27)。

摘　　要：为了促进真空感应熔炼GH4169合金过程中夹杂物的去除,建立了电磁-流动-粒子跟踪耦合数学模型,研究了真空感应熔炼过程中熔液流动与夹杂物运动的规律,对比了不同冶炼工艺参数下熔池中流场和夹杂物运动特点,提出了一种促进真空感应熔炼过程中夹杂物去除的工艺优化方法。结果表明,真空感应熔炼过程中,熔池流场中存在2个漩涡,加快漩涡的运动速度可以促进熔池内夹杂物的去除,熔液流动速度随着熔炼的进行先升高后下降,最终趋于稳定。随着电压增加,熔液平均流动速度增加,熔池内夹杂物总去除率升高。随着电流频率升高,熔液平均流动速度降低,熔池内夹杂物总去除率降低。因此可通过增大电压、减小电流频率的方法,增大熔液流动速度,促进真空感应熔炼GH4169合金过程中夹杂物的去除,工艺参数由400 V、3 400 Hz优化为420 V、3 200 Hz后,夹杂物总去除率由91.98%增大到94.87%,提高了2.89%。In order to promote the removal of inclusions in the vacuum induction melting(VIM) of GH4169 alloy,a coupled electromagnetic-flow-particle tracking mathematical model was established,and the laws of melt flow and inclusions movement in vacuum induction melting were studied.The characteristics of flow field and inclusions movement in the melt pool with different smelting process parameters were compared,and a optimization method to promote removal of inclusions in vacuum induction melting was proposed.The results show that there are two vortices in the flow field of melt pool,accelerating the velocity of which can promote the removal of inclusions.The melt flow velocity increases firstly,then decreases with the process of smelting,and eventually stabilises.As the voltage increasing,the average melt flow velocity and the total removal rate of inclusions in the melt pool are both increased.As the current frequency increasing,the average melt flow velocity and the total removal rate of inclusions in the melt pool are both decreased.Therefore,the melt flow velocity can be increased by increasing the voltage and decreasing the current frequency,so as to achieve the effect of promoting inclusion removal in VIM of GH4169 alloy.The VIM process parameters optimized from 400 V,3 400 Hz to 420 V,3 200 Hz,which increased the total inclusions removal rate from 91.98% to 94.87%,and the rate increased by 2.89%.

关 键 词：真空感应熔炼 数值模拟 GH4169合金 流场 夹杂物 

分 类 号：TF133[冶金工程—冶金物理化学]