Critical precipitation behavior of MnTe inclusions in resulfurized steels during solidification  

作　　者：Xiangyu Xu Lu Zhang Zifei Wang Qianren Tian Jianxun Fu Xuemin Wang 

机构地区：[1]Center for Advanced Solidification Technology(CAST),School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China [2]State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China [3]Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China [4]Yangjiang Branch,Guangdong Laboratory for Materials Science and Technology(Yangjiang)Advanced Alloys Laboratory,Yangjiang 529500,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第8期1849-1857,共9页矿物冶金与材料学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.52104335,51874195 and 52074179);the Shanghai“Super Postdoctoral”Incentive Plan(No.2020194).

摘　　要：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.

关 键 词：resulfurized steels modification of inclusion manganese telluride precipitation 

分 类 号：TF76[冶金工程—钢铁冶金]