精炼渣中TiO<sub>2</sub>对含Ti铁素体不锈钢夹杂物的影响

冯晓霞; 王旗; 谭博; 王丽君; 周国治

doi:10.7513/j.issn.1004-7638.2020.02.020

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精炼渣中TiO₂对含Ti铁素体不锈钢夹杂物的影响

doi: 10.7513/j.issn.1004-7638.2020.02.020

1. 北京科技大学钢铁共性技术协同创新中心, 北京 100083;
2. 北京科技大学钢铁冶金新技术国家重点实验室, 北京 100083

基金项目:

国家自然科学基金(U1810207)；国家自然科学基金(51734002)

详细信息

作者简介:
冯晓霞(1994-),女,硕士研究生,主要从事不锈钢中夹杂物控制的研究,E-mail:1421157355@qq.com;王丽君(1979-),女,博士,研究领域:炼钢,E-mail:lijunwang@ustb.edu.cn

中图分类号: TF769,TF703
计量
- 文章访问数: 14
- HTML全文浏览量: 4
- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2019-09-24

Effect of TiO₂ in Refining Slag on Inclusions in Ti-Ferritic Stainless Steel

1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;
2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 实验室条件下使用Al脱氧,考察精炼渣中TiO₂对含Ti不锈钢中夹杂物的影响。结果表明,精炼渣中不含TiO₂时,夹杂物从Al₂O₃区向MgO-Al₂O₃区演变,形成MgO-Al₂O₃的直径约4μm;精炼渣中含有TiO₂时,夹杂物先向高TiO_x区演变,再向MgO-Al₂O₃区演变,最终形成2~3μm的MgO-Al₂O₃-TiO_x。分析表明,当精炼渣中含有TiO₂时,夹杂物中出现TiO₂,减小了夹杂物的尺寸,而且精炼渣中添加TiO₂使得渣中TiO₂的活度增大,抑制了钢中Ti的氧化,增加了TiN的析出数量与尺寸,导致周围富集的Nb含量较少,减小了NbC的尺寸。
- 不锈钢 /
- 精炼渣 /
- TiO₂ /
- 夹杂物 /
- TiN
Abstract: The effect of TiO₂ in the refining slag on the inclusions in Ti-containing stainless steel was investigated under laboratory conditions during Al deoxidation.The results indicate that the inclusions initial Al₂O₃ forms then change into MgO-Al₂O₃ type inclusions with the dimention of 4 μm when the top slag does not contain TiO₂.In the case of TiO₂-bearing slag,the inclusion composition is migrated firstly to the high TiO_x region,then to MgO-Al₂O₃ types.Finally,TiO₂-MgO-Al₂O₃ forms in average size of 2～3 μm.The inclusion size is decreased with the addition of TiO₂.And the presentence of TiO₂ in top slag can prevent the oxidation of Ti in molten steel by increasing the activity of TiO₂ in slag phase.Meanwhile,TiN precipitation is enhanced both in amount and size,which also lowers the Nb content around TiN.Thus,NbC participation becomes smaller then that participate in the sample refined by the slag without TiO₂.
- stainless steel /
- refining slag /
- TiO₂ /
- inclusions /
- TiN