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

Song Guangjie; Wang Yi; He Jianzhong; Zhang Daxian; Fu Jianxun

doi:10.7513/j.issn.1004-7638.2024.06.021

Volume 45 Issue 6

Dec. 2024

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2024 > 45(6): 159-166

Song Guangjie, Wang Yi, He Jianzhong, Zhang Daxian, Fu Jianxun. Study on the inclusion distribution behavior of U71Mn heavy rail steel after rolling[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(6): 159-166. doi: 10.7513/j.issn.1004-7638.2024.06.021

Citation:

Song Guangjie, Wang Yi, He Jianzhong, Zhang Daxian, Fu Jianxun. Study on the inclusion distribution behavior of U71Mn heavy rail steel after rolling[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(6): 159-166. doi: 10.7513/j.issn.1004-7638.2024.06.021

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

doi: 10.7513/j.issn.1004-7638.2024.06.021

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

Received Date: 2024-06-26
Available Online: 2024-12-30
Publish Date: 2024-12-30

Abstract

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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References

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