Effect of Slag Adjustment on Inclusions and Mechanical Properties of Si-Killed 55SiCr Spring Steel
The effects of the Al<sub>2</sub>O<sub>3</sub> content and basicity of CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–10 wt.% MgO refining slag on inclusions removal in 55SiCr spring steel were investigated. The viscosity of slag was studi...
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MDPI AG
2022-11-01
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| Online Access: | https://www.mdpi.com/2073-4352/12/12/1721 |
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| author | Yang Li Changyong Chen Hao Hu Hao Yang Meng Sun Zhouhua Jiang |
| author_facet | Yang Li Changyong Chen Hao Hu Hao Yang Meng Sun Zhouhua Jiang |
| author_sort | Yang Li |
| collection | DOAJ |
| description | The effects of the Al<sub>2</sub>O<sub>3</sub> content and basicity of CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–10 wt.% MgO refining slag on inclusions removal in 55SiCr spring steel were investigated. The viscosity of slag was studied using a viscometer, while the microstructure investigation involved using a water-quenching furnace and a Fourier-transform infrared spectrometer. The influence mechanism of the slag adjustment on inclusions was explored through thermodynamic calculations and kinetic analysis. The results indicated that the viscosity of the molten slag increased gradually with the content of Al<sub>2</sub>O<sub>3</sub> increasing due to it increasing the degree of polymerization of the slag network structure, especially the [AlO<sub>4</sub>]<sup>5−</sup> and [Si-O-Si] structures. In contrast, the viscosity of molten slag experienced the opposite pattern, with the basicity of molten slag increasing. This was due to the fact that Ca<sup>2+</sup> can significantly reduce the degree of polymerization of a slag network structure, especially the percentages of the [SiO<sub>4</sub>]<sup>4−</sup>, [AlO<sub>4</sub>]<sup>5−</sup> and [Si-O-Si] network structures. Finally, the changes in physical properties and structure of slag significantly affected the removal effect of the inclusions in molten steel. As a result, the number, size distribution, composition distribution and morphology of the inclusions displayed significant changes when the content of Al<sub>2</sub>O<sub>3</sub> increased from 3 wt.% to 12 wt.% and the basicity of the slag gradually increased from 0.5 to 1.2. |
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| last_indexed | 2024-03-09T17:10:39Z |
| publishDate | 2022-11-01 |
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| series | Crystals |
| spelling | doaj.art-bd67c9e07e784baf8e0d8c591153d5df2023-11-24T14:09:49ZengMDPI AGCrystals2073-43522022-11-011212172110.3390/cryst12121721Effect of Slag Adjustment on Inclusions and Mechanical Properties of Si-Killed 55SiCr Spring SteelYang Li0Changyong Chen1Hao Hu2Hao Yang3Meng Sun4Zhouhua Jiang5Department of Special Steel Metallurgy, School of Metallurgy, Northeastern University, Shenyang 110819, ChinaDepartment of Special Steel Metallurgy, School of Metallurgy, Northeastern University, Shenyang 110819, ChinaDepartment of Special Steel Metallurgy, School of Metallurgy, Northeastern University, Shenyang 110819, ChinaDepartment of Special Steel Metallurgy, School of Metallurgy, Northeastern University, Shenyang 110819, ChinaDepartment of Special Steel Metallurgy, School of Metallurgy, Northeastern University, Shenyang 110819, ChinaDepartment of Special Steel Metallurgy, School of Metallurgy, Northeastern University, Shenyang 110819, ChinaThe effects of the Al<sub>2</sub>O<sub>3</sub> content and basicity of CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–10 wt.% MgO refining slag on inclusions removal in 55SiCr spring steel were investigated. The viscosity of slag was studied using a viscometer, while the microstructure investigation involved using a water-quenching furnace and a Fourier-transform infrared spectrometer. The influence mechanism of the slag adjustment on inclusions was explored through thermodynamic calculations and kinetic analysis. The results indicated that the viscosity of the molten slag increased gradually with the content of Al<sub>2</sub>O<sub>3</sub> increasing due to it increasing the degree of polymerization of the slag network structure, especially the [AlO<sub>4</sub>]<sup>5−</sup> and [Si-O-Si] structures. In contrast, the viscosity of molten slag experienced the opposite pattern, with the basicity of molten slag increasing. This was due to the fact that Ca<sup>2+</sup> can significantly reduce the degree of polymerization of a slag network structure, especially the percentages of the [SiO<sub>4</sub>]<sup>4−</sup>, [AlO<sub>4</sub>]<sup>5−</sup> and [Si-O-Si] network structures. Finally, the changes in physical properties and structure of slag significantly affected the removal effect of the inclusions in molten steel. As a result, the number, size distribution, composition distribution and morphology of the inclusions displayed significant changes when the content of Al<sub>2</sub>O<sub>3</sub> increased from 3 wt.% to 12 wt.% and the basicity of the slag gradually increased from 0.5 to 1.2.https://www.mdpi.com/2073-4352/12/12/172155SiCr steelspring steelrefining slagnon-metallic inclusionshigh temperature viscosity |
| spellingShingle | Yang Li Changyong Chen Hao Hu Hao Yang Meng Sun Zhouhua Jiang Effect of Slag Adjustment on Inclusions and Mechanical Properties of Si-Killed 55SiCr Spring Steel Crystals 55SiCr steel spring steel refining slag non-metallic inclusions high temperature viscosity |
| title | Effect of Slag Adjustment on Inclusions and Mechanical Properties of Si-Killed 55SiCr Spring Steel |
| title_full | Effect of Slag Adjustment on Inclusions and Mechanical Properties of Si-Killed 55SiCr Spring Steel |
| title_fullStr | Effect of Slag Adjustment on Inclusions and Mechanical Properties of Si-Killed 55SiCr Spring Steel |
| title_full_unstemmed | Effect of Slag Adjustment on Inclusions and Mechanical Properties of Si-Killed 55SiCr Spring Steel |
| title_short | Effect of Slag Adjustment on Inclusions and Mechanical Properties of Si-Killed 55SiCr Spring Steel |
| title_sort | effect of slag adjustment on inclusions and mechanical properties of si killed 55sicr spring steel |
| topic | 55SiCr steel spring steel refining slag non-metallic inclusions high temperature viscosity |
| url | https://www.mdpi.com/2073-4352/12/12/1721 |
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