铈和钙处理对NM450钢中夹杂物的影响

郭树豪; 刘金瑞; 高军; 樊立峰; 崔衡

doi:10.7513/j.issn.1004-7638.2025.01.022

铈和钙处理对NM450钢中夹杂物的影响

doi: 10.7513/j.issn.1004-7638.2025.01.022

郭树豪^1,,
刘金瑞¹,
高军²,
樊立峰³,
崔衡^1, ,

1.
北京科技大学钢铁共性技术协同创新中心, 北京 100083
2.
内蒙古包钢钢联股份有限公司制造部, 内蒙古包头 014010
3.
内蒙古工业大学材料科学与工程学院, 内蒙古呼和浩特 010051

基金项目: 中央引导地方科技发展资金（2022ZY0001)。

详细信息

作者简介:
郭树豪，1996年出生，男，河北邯郸人，硕士研究生，从事钢铁冶金夹杂物研究， E-mail：13366568362@163.com

通讯作者:
崔衡，1978年生，男，内蒙古包头市人，博士生导师，研究员，从事钢铁冶金研究，E-mail：cuiheng@ustb.edu.cn

中图分类号: TF76,TG115
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- 文章访问数: 53
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- 被引次数: 0
出版历程
- 收稿日期: 2024-01-09
- 刊出日期: 2025-02-27

Effects of cerium and calcium treatment on the inclusions in NM450 steel

GUO Shuhao^1
,,
LIU Jinrui¹,
GAO Jun²,
FAN Lifeng³,
CUI Heng^{1
, ,}

1.
Collaborative Innovation Center of University of Science and Technology Beijing, Beijing, 100083, China
2.
Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, Inner Monolia, China
3.
School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, Inner Monolia, China

摘要

摘要: 通过配置有AZtecFeature自动夹杂物分析模块的扫描电镜-能谱仪（SEM-EDS）和Factsage热力学计算，研究了国内某厂稀土NM450钢生产过程中的Ca处理和Ce处理对钢中夹杂物的演化过程的影响。结果表明：经过0.0015%Ce处理，钢液中主要夹杂物xCaO·yAl₂O₃被改性为低熔点xCaO·yAl₂O₃·zCe₂O₃、CeAlO₃+xCaO·yAl₂O₃、CeAlO₃+xCaO·yAl₂O₃+CaS和低熔点xCaO·yAl₂O₃·zCe₂O₃ +CaS夹杂物。Ce处理20 min后，钢中约53%夹杂物被去除。钢液中[Ce]扩散进入xCaO·yAl₂O₃形成低熔点xCaO·yAl₂O₃·zCe₂O₃夹杂物。钢液中的xCaO·yAl₂O₃与[Ce]反应产生CeAlO₃，进而生成CeAlO₃+xCaO·yAl₂O₃夹杂物。二次Ca处理后，含Ce夹杂物种类没有发生改变，尽管部分夹杂物转化为液态夹杂物，但同时导致了夹杂物总体数量上升，且CaS成为了主要夹杂物。这表明现行Ce处理协同双Ca处理的精炼工艺存在钙处理过量的问题。
- 非金属夹杂物 /
- Ce处理 /
- Ca处理 /
- NM450钢 /
- 夹杂物改性
Abstract: The effects of Ca treatment and Ce treatment on the steel inclusions during the steelmaking process of Ce-contented NM450 steel were studied. The evolution process of inclusions in steel was analyzed by Scanning electron microscope-energy dispersive spectrometer ( SEM-EDS ) equipped with AZtecFeature automatic inclusion analysis module and Factsage thermodynamic calculation. After 0.0015% Ce treatment, the main inclusions in the molten steel are modified from xCaO·yAl₂O₃ into complex inclusions such as low melting point xCaO·yAl₂O₃·zCe₂O₃, CeAlO₃+xCaO·yAl₂O₃, CeAlO₃+xCaO·yAl₂O₃+CaS and low melting point xCaO·yAl₂O₃·zCe₂O₃ +CaS. About 53% of the inclusions in the steel were removed after Ce treatment for 20 minutes. [Ce] diffuses into xCaO·yAl₂O₃ to form low melting point xCaO·yAl₂O₃·zCe₂O₃ inclusions in the molten steel. xCaO · yAl₂O₃ in the molten steel reacts with [Ce] to produce CeAlO₃, which in turn generates CeAlO₃+xCaO · yAl₂O₃ inclusions. After the secondary Ca treatment, the Ce inclusion species did not change. Although some of the inclusions were converted into liquid inclusions, the overall number of inclusions increased, and CaS became the dominant inclusion. It indicates that there is a problem of excessive calcium treatment in the current Ce treatment combined with double Ca refining treatment processes.
- non-metallic inclusions /
- Ce treatment /
- Ca treatment /
- NM450 steel /
- inclusion modification

HTML全文

图 1 Ce处理、Ca处理和钢液取样时机示意

Figure 1. Schematic diagram of Ce-Ca treatment and steel liquid sampling timing

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图 2 钢中夹杂物占比、数密度和和平均尺寸统计

Figure 2. Statistical diagram of the proportion, number density and average size of inclusions in steels

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图 3 加Ce前钢中典型夹杂物的形貌和EDS面扫描结果

Figure 3. Morphology and EDS elemental maps of typical inclusions in steels before Ce treatment

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图 4 Ce处理后钢中典型夹杂物的形貌和EDS面扫描结果

(a) 低熔点xCaO·yAl₂O₃·zCe₂O₃夹杂物；(b) CeAlO₃+xCaO·yAl₂O₃复合夹杂物；(c) CeAlO₃+xCaO·yAl₂O₃+CaS复合夹杂物

Figure 4. Morphologies and EDS elemental maps of typical inclusions in steels after Ce treatment

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图 5 Ca处理后钢中典型夹杂物的形貌和EDS面扫描结果

(a) CaS+低熔点xCaO·yAl₂O₃·zCe₂O₃复合夹杂物；(b) CaS夹杂物

Figure 5. Morphologies and EDS elemental maps of typical inclusions in steels after secondary Ca treatment

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图 6 NM450钢体系中1600 ℃下Ca-Ce平衡图

Figure 6. Stability diagram of NM450 steel system at 1600 ℃

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图 7 Ce-Al-Ca-O夹杂物在CaO-AlO_1.5-CeO_1.5相图中的组成分布

Figure 7. Composition distribution of Ce-Al-Ca-O inclusions in the CaO-AlO_1.5-CeO_1.5 phase diagram

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表 1 试验钢样化学成分

Table 1. Chemical composition of wear-resistant steel %

C Si Mn P Cr Mo Nb Al Ti

0.194 0.255 1.242 0.0098 0.7828 0.2825 0.0189 0.0507 0.0142

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