使用三维X射线显微镜研究高锰高铝钢低碱度保护渣中气泡的逸出行为

刘强; 李想; 杜申; 高茗; 尹延斌; 张炯明

doi:10.1007/s12613-024-2896-6

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文章导航 > 矿物冶金与材料学报（英文） > 2025 > 二校

Qiang Liu, Xiang Li, Shen Du, Ming Gao, Yanbin Yin, and Jiongming Zhang, Investigation of bubbles escape behavior from low basicity mold flux for high-Mn high-Al steels using 3D X-ray microscope, Int. J. Miner. Metall. Mater.,(2025). https://doi.org/10.1007/s12613-024-2896-6

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Qiang Liu, Xiang Li, Shen Du, Ming Gao, Yanbin Yin, and Jiongming Zhang, Investigation of bubbles escape behavior from low basicity mold flux for high-Mn high-Al steels using 3D X-ray microscope, Int. J. Miner. Metall. Mater.,(2025). https://doi.org/10.1007/s12613-024-2896-6

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研究论文

使用三维X射线显微镜研究高锰高铝钢低碱度保护渣中气泡的逸出行为

北京科技大学绿色低碳钢铁冶金全国重点实验室, 北京 100083, 中国

通讯作者:
张炯明 E-mail: jmz2203@sina.com

文章亮点

(1) 使用三维X射线显微镜对保护渣中1~100μm的气泡的空间分布和三维形态学参数进行了直观、准确和全面的统计

(2) 碱度为0.52~1.03的高锰高铝钢保护渣，粘度碱度升高而降低，保护渣逐渐解聚，转折温度增加

(3) 气泡运动速率随粘度减小而增加，渣中残留气泡的体积分数和等效球直径减小，提高碱度、温度和保温时间均有利于气泡的去除

中文摘要

在高锰高铝钢的连铸过程中，氩气等各种气体都需要通过结晶器顶部的保护渣逸出。气泡穿越保护渣液渣层是逸出过程中的限制性环节，主要与保护渣粘度和液渣层厚度有关。相对于传统二维表面分析技术研究渣中的气泡尺寸和分布，三维表征是一种更直观、准确和全面的分析方法。因此，本研究采用三维X射线显微镜获得了不同碱度、不同温度和不同保温时间下保护渣中残余气泡的空间分布和三维形貌特征。结果表明，保护渣碱度从0.52增加到1.03，温度从1423 K增加到1573 K的过程中，保护渣的粘度逐渐减小，气泡的上浮速率增加；保温时间从10 s增加到30 s的过程中，凝固的保护渣中残存气泡的体分数和平均等效球直径逐渐减小，尤其是大气泡去除效果明显。提高碱度、温度和保温时间均有利于气泡去除效率的增加。气泡逸出行为的研究对高锰高铝钢低碱度保护渣的性能优化有意义的。

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Research Article

Investigation of bubbles escape behavior from low basicity mold flux for high-Mn high-Al steels using 3D X-ray microscope

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Abstract

Abstract

During the continuous casting process of high-Mn high-Al steels, various types of gases such as Ar need to escape through the top of the mold. In which, the behavior of bubbles traversing the liquid slag serves as a restrictive link, closely associated with viscosity and the thickness of liquid slag. In contrast to two-dimensional surface observation, three-dimensional (3D) analysis method can offer a more intuitive, accurate, and comprehensive information. Therefore, this study employs a 3D X-ray microscope (3D-XRM) to obtained spatial distribution and 3D morphological characteristics of residual bubbles in mold flux under different basicity of liquid slag, different temperatures, and different holding times. The results indicate that as basicity of slag increases from 0.52 to 1.03, temperature increases from 1423 to 1573 K, the viscosity of slag decreases, the floating rate of bubbles increases. In addition, when holding time increases from 10 to 30 s, the bubbles floating distance increases, and the volume fraction and average equivalent sphere diameter of the bubbles solidified in the mold flux gradually decreases. In one word, increasing the basicity, temperature, and holding time leading to an increase in the removal rate of bubbles especially for the large. These findings of bubbles escape behavior provide valuable insights into optimizing low basicity mold flux for high-Mn high-Al steels.
- mold flux;
- low basicity;
- bubbles;
- three-dimensional X-ray microscope;
- viscosity

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References

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