1 State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
1 State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
摘要 In order to reduce the negative effect of gross Al-rich inclusions on high aluminum steel, both thermodynamic calculations and designed deoxidization experiments were performed in condition of different silicon and aluminum deoxidization sequences. Thermodynamic calculations demonstrated that the complex inclusions with low melting point (harmless inclusions) are more favorable to be formed in condition that the melt was deoxidized using ferrosilicon first and then pure aluminum (Si/Al deoxidization) than that deoxidized using pure aluminum first and then ferrosilicon (Al/Si deoxidization). Al-rich inclusion decreases 83% from Al/Si deoxidization to Si/Al deoxidization. The experimental results showed that the total quantity of inclusions decreases by 24% and the proportion of harmless inclusions is doubled when comparing Si/Al deoxidization with Al/Si deoxidization. The morphology of complex inclusion tends to be spherical, and the mean size is less than 5 lm in condition of Si/Al deoxidization. The formation mechanism of harmless inclusions was discussed, and it is believed that the inclusions can be controlled reasonably in high aluminum steel using Si/Al deoxidization.
Abstract：In order to reduce the negative effect of gross Al-rich inclusions on high aluminum steel, both thermodynamic calculations and designed deoxidization experiments were performed in condition of different silicon and aluminum deoxidization sequences. Thermodynamic calculations demonstrated that the complex inclusions with low melting point (harmless inclusions) are more favorable to be formed in condition that the melt was deoxidized using ferrosilicon first and then pure aluminum (Si/Al deoxidization) than that deoxidized using pure aluminum first and then ferrosilicon (Al/Si deoxidization). Al-rich inclusion decreases 83% from Al/Si deoxidization to Si/Al deoxidization. The experimental results showed that the total quantity of inclusions decreases by 24% and the proportion of harmless inclusions is doubled when comparing Si/Al deoxidization with Al/Si deoxidization. The morphology of complex inclusion tends to be spherical, and the mean size is less than 5 lm in condition of Si/Al deoxidization. The formation mechanism of harmless inclusions was discussed, and it is believed that the inclusions can be controlled reasonably in high aluminum steel using Si/Al deoxidization.
BO-WEN -PENG. Inclusion control study in high aluminum steel[J]. Journal of Iron and Steel Research International, 2018, 25(8): 796-802.
[1]
Z.G. Yang, S X Li, J M Zhang, Acta Mater. 52(2004) 5235-5241.
[2]
M.D. Chapetti, T. Tagawa, T. Miyata, Mater Sci Eng. 356(2003) 236-244.
[3]
H. Todoroki, S.Inada, Iron Steel Inst. 8(2003) 275-276.
[4]
C. Bertrand, J. Molinero, S. Landa, Ironmak Steelmak. 30(2003) 165-169.
[5]
H. Suito, R. Inoue, Isij Int. 36(1996) 528-536.
[6]
S. Kimura, K. Nakajima, S Mizoguchi, Metall Mater Trans B. 32(2001) 79-85.
[7]
Y. J. Kang, F. Li, K. Morita, Steel Res Int. 77(2006) 785-792.
[8]
Y. Kobayashi, H. Todoroki, H. Tsuji, Isij Int. 51(2011) 35-40.
[9]
M. Jiang, X. Wang, B. Chen, Isij Int. 48(2008) 885-890.
[10]
K. Xu, L. Xiao, Iron Steel. 47(2012) 1-13.(in Chinese)
[11]
Y. Kwon, J. Choi, S. Sridhar, Metall Mater Trans B. 42(2011) 814-824.
[12]
S. Nurmi, S. Louhenkilpi, L. Holappa, Steel Res Int. 84(2013) 323-327.
[13]
Recommended Values of Equilibrium Constants for the Reactions in Steelmaking, Japan Society for the Promotion of Science, 19th Committee, Tokyo, (1984), 255.
[14]
L. Li, J. Zhang, Special Steel. 2(1990) 10-18.(in Chinese)
[15]
H Itoh, M Hino, S Banya, Tetsu to Hagane. 83(2009) 623-628.
[16]
M. Jiang, X. Wang, B. Chen, Isij Int. 50(2010) 95-104.
[17]
H Itoh, M Hino, B Y Shiro, Tetsu to Hagane. 83(1997) 773-778.
[18]
J. X. Chen, Common chart data for steel making, first ed., Metallurgical Industry Press, Beijing, 1984.(in Chinese)
[19]
M Itoh, J Soc Leath Tech Ch. 35(2010) 514-519.
[20]
L A Mondy, M S Ingber, Comput Mech. 11(1993) 11-27.
2018, Vol. 25 
