Critical precipitation behavior of MnTe inclusions in resulfurized steels during solidification

Xiangyu Xu; Lu Zhang; Zifei Wang; Qianren Tian; Jianxun Fu; Xuemin Wang

doi:10.1007/s12613-023-2757-8

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Xiangyu Xu, Lu Zhang, Zifei Wang, Qianren Tian, Jianxun Fu, and Xuemin Wang, Critical precipitation behavior of MnTe inclusions in resulfurized steels during solidification, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2757-8

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Xiangyu Xu, Lu Zhang, Zifei Wang, Qianren Tian, Jianxun Fu, and Xuemin Wang, Critical precipitation behavior of MnTe inclusions in resulfurized steels during solidification, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2757-8

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Research Article

Critical precipitation behavior of MnTe inclusions in resulfurized steels during solidification

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Corresponding author:
Jianxun Fu E-mail: fujianxun@shu.edu.cn
Received: 30 June 2023; Revised: 8 October 2023; Accepted: 9 October 2023; Available online: 12 October 2023

Abstract

Abstract

Te treatment is an effective method for modifying sulfide inclusions, and MnTe precipitation has an important effect on thermal brittleness and steel corrosion resistance. In most actual industrial applications of Te treatment, MnTe precipitation is unexpected. The critical precipitation behavior of MnTe inclusions was investigated through scanning electron microscopy, transmission electron microscopy, machine learning, and first-principles calculation. MnTe preferentially precipitated at the container mouth for sphere-like sulfides and at the interface between MnS grain boundaries and steel matrix for rod-like sulfides. The MnS/MnTe interface was semicoherent. A composition transition zone with a rock-salt structure exhibiting periodic changes existed to maintain the semicoherent interface. The critical precipitation behavior of MnTe inclusions in resulfurized steels involved three stages at varying temperatures. First, Mn(S,Te) precipitated during solidification. Second, MnTe with a rock-salt structure precipitated from Mn(S,Te). Third, MnTe with a hexagonal NiAs structure transformed from the rock-salt structure. The solubility of Te in MnS decreased with decreasing temperature. The critical precipitation behavior of MnTe inclusions in resulfurized steels was related to the MnS precipitation temperature. With the increase in MnS precipitation temperature, the critical Te/S weight ratio decreased. In consideration of the cost-effectiveness of Te addition for industrial production, the Te content in resulfurized steels should be controlled in accordance with MnS precipitation temperature and S content.
- resulfurized steels;
- modification of inclusion;
- manganese telluride;
- precipitation

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