Abstract
Al-Ti-O inclusions always clog submerged nozzles in Ti-bearing Al-killed steel. A typical synthesized Al2TiO5 inclusion was immersed in a CaO-SiO2-Al2O3 molten slag for different durations at 1823 K. The Al2TiO5 dissolution paths and mechanism were revealed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Decreased amounts of Ti and Al and increased amounts of Si and Ca at the dissolution boundary prove that inclusion dissolution and slag penetration simultaneously occur. SiO2 diffuses or penetrates the inclusion more quickly than CaO, as indicated by the w(CaO)/w(SiO2) value in the reaction region. A liquid product (containing 0.7–1.2 w(CaO)/w(SiO2), 15wt%–20wt% Al2O3, and 5wt%–15wt% TiO2) forms on the inclusion surface when Al2TiO5 is dissolved in the slag. Al2TiO5 initially dissolves faster than the diffusion rate of the liquid product toward the bulk slag. With increasing reaction time, the boundary reaches its largest distance, the Al2TiO5 dissolution rate equals the liquid product diffusion rate, and the dissolution process remains stable until the inclusion is completely dissolved.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
K. Yamamoto, T. Hasegawa, and J. Takamura, Effect of boron on intra-granular ferrite formation in Ti-oxide bearing steels, ISIJ Int., 36(1996), No.1, p.80.
L.M. Peng, Z. Li, and H. Li, Effects of microalloying and ceramic particulates on mechanical properties of TiAl-based alloys, J. Mater. Sci., 41(2006), No.22, p.7524.
M. Vedani and A. Mannucci, Effect of titanium addition on precipitate and microstructural control in C-Mn microalloyed steel, ISIJ Int., 42(2002), No.12, p.1520
Y. Kawashima, Y. Nagata, and K. Shinme, Influence of Ti concentration on nozzle clogging on Al-Ti deoxidation: be havior of inclusion on Al-Ti deoxidation-2, CAMP-ISIJ, 4(1991), No.4, p.1237.
S. Basu, S.K. Choudhary, and N.U. Girase, Nozzle clogging behaviour of Ti-bearing Al-killed ultra low carbon steel, ISIJ Int., 44(2004), No.10, p.1653.
I.H. Jung, S.A. Decterov, and A.D. Pelton, A thermodynamic model for deoxidation equilibrium in steel, Metall. Mater. Trans. B, 35(2004), No.3, p.493.
M.K. Sun, I.H. Jung, and H.G. Lee, Morphology and chemistry of oxide inclusions after Al and Ti complex deoxidation, Met. Mater. Int., 14(2008), No.6, p.791.
W.C. Doo, D.Y. Kim, S.C. Kang, et al., The morphology of Al-Ti-O complex oxide inclusions formed in an ultra low-carbon steel melt during the RH process, Met. Mater. Int., 13(2007), No.3, p.249.
F. Ruby-Meyer, J. Lehmann, and H. Gaye, Thermodynamic analysis of inclusion in Ti-deoxidized steel, Scand. J. Metall., 29(2000), No.5, p.206.
Y. Oishi, A.R. Cooper Jr., and W.D. Kingery, Dissolution in ceramic systems: III. Boundary layer concentration gradients, J. Am. Ceram. Soc., 48(1965), No.2, p.88.
W.D. Cho and P. Fan, Diffusional dissolution of alumina in various steelmaking slag, ISIJ Int., 44(2004), No.2, p.229.
J.H. Park, I.H. Jung, and H.G. Lee, Dissolution behavior of Al2O3 and MgO inclusions in the CaO-Al2O3-SiO2 slag: formation of ring-like structure of MgAl2O4 and Ca2SiO4 around MgO inclusions, ISIJ Int., 46(2006), No.11, p.1626.
J.J. Park, J.O. Jo, S.I. Kim, et al., Thermodynamics of titanium and oxygen dissolved in liquid iron equilibrated with titanium oxides, ISIJ Int., 47(2007), No.1, p.16.
K.H. Sandhage and G.J. Yurek, Indirect dissolution of sapphire into silicate melts, J. Am. Ceram. Soc., 71(1998), No.6, p.478.
M. Valdez, G.S. Shannon, and S. Sridhar, The ability of slags to absorb Solid oxide inclusions, ISIJ Int., 46(2006), No.3, p.450.
Author information
Authors and Affiliations
Corresponding author
Additional information
This work was financially supported by the National Natural Science Foundation of China (No.50904017).
Rights and permissions
About this article
Cite this article
Wang, Dy., Liu, J., Jiang, Mf. et al. Dissolution of Al2TiO5 inclusions in CaO-SiO2-Al2O3 slags at 1823 K. Int J Miner Metall Mater 18, 646–651 (2011). https://doi.org/10.1007/s12613-011-0490-1
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12613-011-0490-1