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| Precipitation and growth of MnS inclusions in a heavy rail steel |
| FANG Meng-ting1,2, YUAN Hua-zhi2, XIE Xin3, ZENG Jian-hua3, ZHONG Hong-gang2, ZHAI Qi-jie1,2 |
1. Materials Genome Institute of Shanghai University, Shanghai University, Shanghai 200444, China;
2. Center for Advanced Solidification Technology, Shanghai University, Shanghai 200444, China;
3. Panzhihua Research Institute of Iron and Steel Co., Ltd., Pangang Group, Panzhihua 617000, Sichuan, China |
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Abstract It is of great significance to understand and control the process of precipitation and growth of MnS inclusion,result from its morphology and size in slab have a significant effect on the properties of steel. The morphology and size variation of MnS inclusions in the solidification process of U78CrV heavy rail steel bloom were observed by thermal simulator for dendrite growth of continuous casting slab. Combined with thermodynamic and kinetic calculation, the precipitation and growth behavior of MnS inclusions in steel was analyzed. The thermal simulation experiments show that MnS in steel is mainly precipitated at the end of solidification and is mostly distributed in interdendritic region. The MnS in columnar zone is mainly spherical, elliptical and short rod-shaped, with an average equivalent radius of 2.42 μm and a maximum equivalent radius of 4.19 μm. The MnS in equiaxed zone is mostly irregular, with an average equivalent radius of 4.01 μm and a maximum equivalent radius of 7.58 μm. The thermodynamic calculation shows that the solidification fraction of MnS precipitation in columnar zone is 0.97, and the corresponding temperature is 1 663 K, which is 9 K higher than the solidus. Whereas,the solidification fraction and the corresponding temperature in equiaxed zone is 0.95 and 1 623 K, which is 20 K higher than the solidus. The kinetic analysis shows that the theoretical growth radius of MnS in columnar zone is 2.74 μm and that in equiaxed zone is 5.98 μm, which is in good agreement with the experimental results. By comparing the difference of MnS growth time between the columnar zone and equiaxed zone, the reason why the size of MnS in equiaxed zone is obviously larger than that in columnar zone is discussed. Meanwhile, by reducing S content, reducing the segregation of S element in the center of the bloom and increasing the cooling rate, the size of MnS inclusions in equiaxed zone can be effectively reduced and the harm of MnS to the properties of steel can be reduced.
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Received: 25 October 2022
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2023, Vol. 58 
