摘要
本文通过真空自耗电弧炉(VAR)两次熔炼高铁TC4φ720mm成品铸锭,系统研究两次VAR熔炼时直流稳弧(DC)与交流稳弧(AC)对铁元素偏析的影响机制。采用化学分析法和数值模拟手段,结合熔池动力学理论,揭示了不同稳弧制度下电磁搅拌对溶质传输的调控规律。结果表明:交流稳弧通过周期性反转洛伦兹力方向,使熔池深度从1.1m降至0.7m,形成扁平化流场结构,铸锭铁元素纵向偏差从0.05%优化至0.01%(p<0.001),交流稳弧在促进铁元素均匀分布方面表现更为优异,能够有效降低铸锭中铁元素的偏析程度。本研究为高端领域钛合金铸锭成分均匀性控制提供了工艺优化改进思路。
This article systematically studies the influence mechanism of direct current(DC)and alternating current(AC)arc stabilization on iron element segregation during two stages of melting high-speed railway TC4φ720mm finished ingots in a vacuum consumable arc furnace(VAR).By using chemical analysis and numerical simulation methods,combined with the theory of molten pool dynamics,the regulation law of electromagnetic stirring on solute transport under different stirring parametres was revealed.The results showed that AC arc stabilization reduced the depth of the molten pool from 1.1m to 0.7m by periodically reversing the direction of the Lorentz force,forming a flattened flow field structure.The longitudinal deviation of iron elements in the ingot was optimized from 0.05%to 0.01%(p<0.001).AC stirring current performed better in promoting the uniform distribution of iron elements and effectively reducing the degree of iron element segregation in the ingot.This study provides a process optimization path for the homogenization control of titanium alloy ingots in high-end application fields.
作者
史莹莹
尹春春
毛玲玲
刘钊
郑亚波
SHI Ying-ying;YIN Chun-chun;MAO Ling-ling;LIU Zhao;ZHENG Ya-bo(Baoji Titanium Industry Co.,Ltd.,Baoji 721014,China)
出处
《世界有色金属》
2025年第22期216-219,共4页
World Nonferrous Metals
