含硫钢凝固过程中MnTe夹杂物的临界析出行为

徐翔宇; 张璐; 王梓菲; 田钱仁; 付建勋; 王学敏

doi:10.1007/s12613-023-2757-8

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(8): 1849-1857

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., 31(2024), No. 8, pp. 1849-1857. https://doi.org/10.1007/s12613-023-2757-8

Cite this article as:

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., 31(2024), No. 8, pp. 1849-1857. https://doi.org/10.1007/s12613-023-2757-8

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研究论文

含硫钢凝固过程中MnTe夹杂物的临界析出行为

1)
上海大学材料科学与工程学院先进凝固技术中心, 上海 200444, 中国
2)
上海大学省部共建高品质特殊钢冶金与制备国家重点实验室, 上海 200444, 中国
3)
北京科技大学钢铁共性技术协同创新中心, 北京 100083, 中国
4)
材料科学与技术广东省实验室阳江分中心(阳江合金材料实验室), 阳江 529500, 中国

通讯作者:
付建勋 E-mail: fujianxun@shu.edu.cn

文章亮点

(1) 解析了MnS/MnTe半共格界面并确定了二者取向关系。

(2) 阐明了MnTe临界析出优先位置并提出了MnTe临界析出相变过程。

(3) 建立了碲化锰临界析出时钢中碲含量经验计算公式。

中文摘要

碲处理技术是硫化物改质的有效方法，碲在含硫钢中通常以在硫化物中固溶和MnTe析出的两种形式存在。然而，MnTe析出会降低材料的热塑性和耐蚀性。因此，碲处理技术在实际工业应用中，大多情况下并不期望MnTe析出。解析碲化锰临界析出行为是碲处理技术推广应用涉及的关键科学问题。本文通过扫描电子显微镜、透射电子显微镜、机器学习和第一性原理计算研究了MnTe夹杂物的临界析出行为。发现MnTe夹杂物优先在球状硫化物的容器口以及棒状硫化物晶界与钢基体界面交合处析出，形成MnS–MnTe复合夹杂物。MnS–MnTe复合夹杂物的相界面为半共格界面，界面处存在NaCl结构周期性变化的成分过渡带，以维持半共格界面。随温度降低，MnTe夹杂物在含硫钢中的临界析出行为可划分为三个阶段：第一阶段，Mn(S,Te)在凝固过程中析出；第二阶段，由于Te在MnS中的固溶度降低，NaCl结构的MnTe从Mn(S,Te)中析出，形成MnS–MnTe复合夹杂物；第三阶段，MnS–MnTe复合夹杂物中的MnTe由NaCl结构转变为六方NiAs结构。含硫钢中MnTe夹杂物的临界析出行为与MnS的析出温度有关。随着MnS析出温度升高，临界Te/S质量比降低。因此，含硫钢工业生产中碲的经济添加量，应按照MnS析出温度和S含量两个方面进行确定。

关键词:

Research Article

Critical precipitation behavior of MnTe inclusions in resulfurized steels during solidification

+ Author Affiliations

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

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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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