VAR电磁搅拌工艺对熔体流动影响的模拟研究
Simulation study on the effect of VAR magnetic stirring process on the melt flow
黄立清 1樊凯 2郭杰 3李超 2李俊杰 3王锦程3
作者信息
- 1. 西北工业大学凝固技术国家重点实验室,陕西西安 710072;湖南湘投金天钛业科技股份有限公司,湖南省高端装备特种钛合金工程技术研究中心,湖南常德 415001
- 2. 湖南湘投金天钛业科技股份有限公司,湖南省高端装备特种钛合金工程技术研究中心,湖南常德 415001
- 3. 西北工业大学凝固技术国家重点实验室,陕西西安 710072
- 折叠
摘要
真空自耗电弧熔炼中熔体的流动行为影响铸锭的凝固特性.熔体运动直接观测困难,因此通过模拟揭示熔体的流动行为非常关键.采用自主开发的三维模拟模型,研究了不同搅拌工艺参数下,熔炼过程中熔体的流动行为及熔池形貌.研究表明,随着搅拌电流从0.01 A逐步增加到25 A(搅拌周期为8 s),熔体旋转速度从0.000 1 m/s近似线性增加到0.212 m/s,熔池逐渐宽化(由V形变成U形),熔池最大深度和熔池体积均存在一个明显的先下降后上升的过程.而随着搅拌周期从1 s逐步增加到24 s(搅拌电流为5 A),熔体旋转速度从0.012 5 m/s快速增加到一个较大值(16 s时为0.081 8 m/s)后趋于稳定,熔池逐渐宽化,熔池最大深度逐渐降低到一个最低值后趋于稳定.搅拌电流和搅拌周期均影响熔体的旋转及平面运动,但两者的影响机理存在一定的差异.
Abstract
The flow behavior of melt in vacuum consumable arc melting affects the solidification char-acteristics of ingots.Direct observation of the melt motion is difficult,so revealing the flow behavior of the melt by simulation is crucial.In this paper,a self-developed three-dimensional simulation model was used to study the melt flow behavior and pool morphology during the melting process under differ-ent stirring process parameters.The research shows that with an increase in the stirring current from 0.01 A to 25 A(under a stirring period of 8 s),the rotational speed of the melt increases near-linearly from 0.000 1 m/s to 0.212 m/s,and the molten pool gradually widens(from V-shaped to U-shaped).In the meanwhile,there is an obvious process of first decreasing and then increasing in the maximum depth and volume of the molten pool.As the stirring period increases from 1 s to 24 s(under a stirring current of 5 A),the rotational speed of the melt gradually increases from 0.012 5 m/s to a high value(0.081 8 m/s at 16 s)and then tends to stabilize.The molten pool gradually widens,and the maximum depth of the molten pool gradually decreases to a minimum value and then tends to stabilize.The stir-ring current and stirring period can affect the rotation and planar motion of the melt,but their affecting mechanisms are different.
关键词
钛合金/真空自耗电弧熔炼/搅拌电磁场/熔体运动Key words
titanium alloy/vacuum arc remelting/stirring magnetic field/molten flow引用本文复制引用
基金项目
博士后国际交流计划(YJ20210408)
出版年
2024
国家科技期刊平台
NSTL
万方数据