摘要
为进一步明晰电渣渣壳凝固过程,结合H13钢固定式结晶器电渣重熔工艺,通过扫描电镜和能谱分析解析了工业CaF_(2)-CaO-Al_(2)O_(3)-MgO电渣渣壳结构及其形成机制。结果表明,受电渣凝固过程相析出行为和渣壳径向传热行为的共同控制,从外(结晶器侧)到内(电渣锭侧),电渣依次生成激冷层、柱状晶区、细小等轴晶区、粗大等轴晶区和二次凝固区5层结构,其中激冷层由玻璃相和CaF_(2)相组成,柱状晶区、等轴晶区和二次凝固区均由CaF_(2)、CaO·2Al_(2)O_(3)和MgO·Al_(2)O_(3)三相组成;从激冷层到粗大等轴晶区,CaF_(2)相比例降低,MgO·Al_(2)O_(3)相比例升高,从粗大等轴晶区到二次凝固区,二者的变化趋势相反。研究结果对于优化电渣成分和电渣重熔工艺具有指导意义。
To further clarify the solidification process of electroslag crust, the structure and formation mechanism of the industrial CaF_(2)-CaO-Al_(2)O_(3)-MgO electroslag crust formed in a fixed mold during the electroslag remelting process of H13 steel were analyzed via scanning electron microscopy and energy spectrum analysis. The results show that, under the joint control of the phase precipitation behavior during solidification process of the electroslag and the radial heat transfer of the crust itself, from the outside(near the mold side) to the inside(near the ingot side), the chilling layer, the columnar crystal zone, the fine equiaxed crystal zone, the coarse equiaxed crystal zone and the secondary solidification zone were generated in turn. The chilling layer was composed of glass and CaF_(2)phase and the columnar crystal zone, the equiaxed crystal zone and the secondary solidification zone were composed of CaF_(2), CaO·2Al_(2)O_(3)and MgO·Al_(2)O_(3)phases. From the chilling layer to the coarse equiaxed zone, the proportion of CaF_(2)phase decreased accompanied by the increase of MgO·Al_(2)O_(3)phase, while, the variation showed opposite from the coarse equiaxed zone to the secondary solidification zone. The results have important significance for optimizing the electroslag composition and the electroslag remelting process.
作者
孟一帆
王震
张蕊
闵义
刘承军
MENG Yifan;WANG Zhen;ZHANG Rui;MIN Yi;LIU Chengjun(Key Laboratory for Ecological Metallurgy of Multimetallic Ministry(Ministry of Education),Shenyang 110819,Liaoning,China;School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China;State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan 114021,Liaoning,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2023年第2期148-154,共7页
Journal of Iron and Steel Research
基金
国家自然科学基金资助项目(51974075)。
关键词
电渣重熔
渣壳
结构
形成机制
electroslag remelting
crust
structure
formation mechanism
