U71Mn重轨钢轧制后夹杂物分布行为研究

宋光洁; 王奕; 何建中; 张达先; 付建勋

doi:10.7513/j.issn.1004-7638.2024.06.021

U71Mn重轨钢轧制后夹杂物分布行为研究

doi: 10.7513/j.issn.1004-7638.2024.06.021

1.
上海大学材料科学与工程学院先进凝固技术中心, 省部共建高品质特殊钢冶金与制备国家重点实验室, 上海 200444
2.
内蒙古包钢钢联股份有限公司, 内蒙古包头 014010

基金项目: 中央引导地方科技发展资金（Nos.2022ZY0124）。

详细信息

作者简介:
宋光洁，2000年出生，男，河南新乡人，硕士研究生，研究方向：材料与化工，E-mail：2422072927@qq.com

通讯作者:
付建勋，1969年出生，男，河南焦作人，教授，研究方向：钢铁冶金，E-mail：fujianxun@shu.edu.cn

中图分类号: TF76,TG115.2
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- 文章访问数: 193
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- 被引次数: 0
出版历程
- 收稿日期: 2024-06-26
- 网络出版日期: 2024-12-30
- 刊出日期: 2024-12-30

Study on the inclusion distribution behavior of U71Mn heavy rail steel after rolling

1.
Center for Advanced Solidification Technology, School of Materials Science and Engineering, Shanghai University, State Key Laboratory of Advanced Special Steel, Shanghai 200444, China
2.
Inner Mongolia Baogang Steel Union Co., Ltd., Baotou 014010, Inner Mongolia, China

摘要

摘要: 非金属夹杂物的形态和分布对重轨钢的性能具有显著影响。采用光学显微镜、扫描电镜、夹杂物三维刻蚀仪、Thermo-calc软件对某厂生产的U71Mn重轨钢中的夹杂物进行了研究。结果表明，U71Mn重轨钢中轨腰处夹杂物的平均等效直径、长宽比最大，数量密度最小。轨头、轨腰、轨底的夹杂物密度分别为18、12、14 个/mm²，平均等效直径分别为2.5 、2.7、2.4 μm，平均长宽比分别为7.4、13.3、6.4。钢中夹杂物以单独存在的MnS和CaO·Al₂O₃·SiO₂·MgO复合夹杂物为主。轨头和轨底处的MnS尺寸较小，集中分布在10～50 μm；轨腰处的MnS夹杂物尺寸较大，多在20～80 μm，且存在多条大尺寸的MnS被轧制在同一条水平线上。CaO·Al₂O₃·SiO₂·MgO复合夹杂物沿轧制方向普遍呈近球形和不规则形。
- U71Mn重轨钢 /
- 夹杂物 /
- 轧制变形 /
- 热力学分析
Abstract: The morphology and distribution of non-metallic inclusions significantly affect the performance of heavy rail steels. This study employed optical microscopy, scanning electron microscopy, a three-dimensional etching instrument for inclusions, and Thermo-calc software to investigate the inclusions in U71Mn heavy rail steel produced by a certain factory. The results show that the average equivalent diameter and aspect ratio of inclusions at the waist of the U71Mn heavy rail steel are the largest, while the number density is the smallest. The inclusion densities in the rail head, waist, and base are 18, 12, and 14/mm², respectively, with the average equivalent diameters of 2.5, 2.7, and 2.4 μm, and the average aspect ratios of 7.4, 13.3, and 6.4, respectively. The main inclusions in the steel are individual MnS and complex inclusions of CaO·Al₂O₃·SiO₂·MgO. The sizes of MnS at the rail head and base are relatively small, mainly distributed between 10~50 μm. The sizes of MnS inclusions at the rail waist are larger, mostly between 20~80 μm, with several large-sized MnS rolled on the same horizontal line. The complex inclusions of CaO·Al₂O₃·SiO₂·MgO generally appear near-spherical or irregular along the rolling direction.
- U71Mn heavy rail steel /
- inclusions /
- rolling deformation /
- thermodynamic analysis

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图 1 取样示意（单位：mm）

C代表拉坯方向；W代表宽度方向；G代表重力方向

Figure 1. Sampling diagram

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图 2 电解装置及原理示意

(a) 电解装置； (b) 电解原理示意

Figure 2. Schematic diagram of electrolysis device and its principle

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图 3 U71Mn重轨钢不同部位夹杂物分布情况

Figure 3. Distribution of inclusions in different parts of U71Mn heavy rail steel

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图 4 U71Mn轨头夹杂物统计结果

（a）夹杂物等效直径占比；（b）夹杂物密度、等效直径分布；（c）夹杂物平均面积、面积占比分布；（d）夹杂物长宽比分布

Figure 4. Statistical results of U71Mn rail head inclusions

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图 5 U71Mn轨腰夹杂物统计结果

（a）夹杂物等效直径占比；（b）夹杂物密度、等效直径分布；（c）夹杂物平均面积、面积占比分布；（d）夹杂物长宽比分布

Figure 5. Statistical results of U71Mn rail waist inclusions

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图 6 U71Mn轨底夹杂物统计结果

（a）夹杂物等效直径占比；（b）夹杂物密度、等效直径分布；（c）夹杂物平均面积、面积占比分布；（d）夹杂物长宽比分布

Figure 6. Statistical results of inclusions at the bottom of U71Mn rail

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图 7 U71Mn钢轨不同位置夹杂物统计对比

Figure 7. Comparison of inclusions at different positions in U71Mn steel rails

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图 8 U71Mn重轨钢平衡凝固相图

Figure 8. Equilibrium solidification phase diagram of U71 Mn heavy rail steel

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图 9 U71Mn重轨钢典型夹杂物二维形貌特征

Figure 9. Two-dimensional morphology characteristics of typical inclusions in U71Mn heavy rail steel

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图 10 U71Mn重轨钢典型夹杂物三维形貌特征

Figure 10. Three-dimensional morphology characteristics of typical inclusions in U71Mn heavy rail steel

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表 1 U71Mn重轨钢化学成分

Table 1. U71Mn heavy rail steel composition %

C Si Mn P S Al Ca V O Fe

0.73 0.35 0.95 0.012 0.002 0.003 0.0012 0.004 0.0009 余量

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