Three-dimensional morphology and thermodynamic calculation of inclusions in stainless steel

被引：0

作者：

Zhang Y.-M. ^{[1
]}

Sun Y.-H. ^{[1
]}

Bai X.-F. ^{[1
]}

Zhuo C. ^{[1
]}

机构：

[1] Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing

来源：

Gongcheng Kexue Xuebao/Chinese Journal of Engineering | 2020年 / 42卷

关键词：

Anhydrous electrolysis; Inclusions; Stanless steel; Thermodynamics; Three-dimensional morphology;

D O I：

10.13374/j.issn2095-9389.2020.03.25.s13

中图分类号：

学科分类号：

摘要：

The typical inclusions in stainless steels were extracted by the anhydrous electrolysis method, the three-dimensional morphology of the inclusions was observed by scanning electron microscopy (SEM), the inclusions were classified and analyzed according to the element composition, and the inclusions with the same chemical composition but different three-dimensional morphology were characterized and summarized. The equilibrium states of the different inclusions were calculated by the thermodynamic software FactSage 7.0, the effects of temperature and molten steel composition on the equilibrium states of inclusions were studied, and the corresponding equilibrium phase diagrams were obtained. In the results, the inclusions in stainless steels can be extracted effectively by the anhydrous electrolysis method, avoiding the error caused by the metallographic method, and the three-dimensional morphology of inclusions can be observed more clearly; according to the SEM observation and measurement, the enrichment area of titanium is likely present at the larger alumina inclusion surface, and most of inclusions are spherical and polyhedral with smooth surface, whose diameters are generally no more than 5 μm. According to the thermodynamic calculation, the inclusions in steels are closely related to the mass fraction of elements in steels; the different mass fractions of Mg, Ti, and Si elements may lead to the different inclusions at 1873 K. © 2020, Science Press. All right reserved.

引用

页码：14 / 20

页数：6

共 22 条

[1] Yang W, Wang X H, Zhang L F, Et al., Characteristics of alumina-based inclusions in low carbon Al-killed steel under no-stirring condition, Steel Res Int, 84, 9, (2013)
[2] Kang Y, Thunman M, Du S C, Et al., Aluminum deoxidation equilibrium of molten iron−aluminum alloy with wide aluminum composition range at 1873 K, ISIJ Int, 49, 10, (2009)
[3] Bai X F, Sun Y H, Zhang Y M., Transient evolution of inclusions during Al and Ti additions in Fe-20 mass pct Cr alloy, Metals, 9, 6, (2019)
[4] Jiang M F, Zhang Z X, Wang D Y, Et al., Inclusions in characteristic of Ti/Al deoxidation steel and the analysis of nozzle clogging problem, Ind Heat, 40, 4, (2011)
[5] Sun Y H, Bai X F, Yin X, Et al., Research on submerged entry nozzles clogging during AISI 321 stainless steel billet casting, Chin J Eng, 38, (2016)
[6] Park J H, Kim D S., Effect of CaO-Al2O3-MgO slags on the formation of MgO-Al2O3 inclusions in ferritic stainless steel, Metall Mater Trans B, 36, 4, (2005)
[7] Wei Y W, Li N, Pan D F., Thermodynamics analysis on the formation of spinel inclusion in the steel via MgO based refractories, Bull Chin Ceram Soc, 25, 6, (2006)
[8] Jiang G L, Li J S, Li X D, Et al., Thermodynamics on the formation and transformation of MgO·Al2O3 inclusions in alloy steel, J Univ Sci Technol Beijing, 31, (2009)
[9] Jiang M, Wang X H, Chen B, Et al., Laboratory study on evolution mechanisms of non-metallic inclusions in high strength alloyed steel refined by high basicity slag, ISIJ Int, 50, 1, (2010)
[10] Lang W Y., Modification Effects of Mg, Ca Treatment on Non-metallic Inclusions in Molten Steel, (2014)

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