Skip to main content
×
×
Home

Numerical modeling of centerline segregation by a combined 3-D and 2-D hybrid model during slab continuous casting

  • Huabiao Chen (a1), Dengfu Chen (a1), Mujun Long (a1), Huamei Duan (a1), Yunwei Huang (a1) and Lintao Gui (a1)...
Abstract

Centerline segregation is one of the typical internal defects, which occurs during slab continuous casting (CC). To investigate and predict the centerline segregation encountered in a continuously cast slab, a combined 3-D and 2-D hybrid simulation model for centerline segregation was developed. The average deviation between the calculated and experimented results reaches as low as 0.5%, which demonstrates that the hybrid simulation model has relatively high reliability. The centerline segregation of the slab was predicted accurately. The results show that macrosegregation occurring during the slab CC process has heredity. In the casting direction, the concentration of solutes in the liquid pool increases gradually until the casting has solidified completely. After complete solidification, the solutes’ concentration maintains an almost constant value. On the centerline, the maximum segregation degree occurs at a position roughly 614 mm from the slab center. The maximum centerline segregation degrees of C, Si, Mn, P, and S solutes are 1.163, 1.058, 1.045, 1.111, and 1.165, respectively.

Copyright
Corresponding author
a)Address all correspondence to these authors. e-mail: chendfu@cqu.edu.cn
b)e-mail: longmujun@cqu.edu.cn
Footnotes
Hide All

Contributing Editor: Susan B. Sinnott

Footnotes
References
Hide All
1.Domitner, J., Wu, M.H., Kharicha, A., Ludwig, A., Kaufmann, B., Reiter, J., and Schaden, T.: Modeling the effects of strand surface bulging and mechanical softreduction on the macrosegregation formation in steel continuous casting. Metall. Mater. Trans. A 45, 1415 (2014).
2.Mayer, F., Wu, M., and Ludwig, A.: On the formation of centreline segregation in continuous slab casting of steel due to bulging and/or feeding. Steel Res. Int. 81, 660 (2010).
3.Fachinotti, V.D., Le Corre, S., Triolet, N., Bobadilla, M., and Bellet, M.: Two-phase thermo-mechanical and macrosegregation modelling of binary alloys solidification with emphasis on the secondary cooling stage of steel slab continuous casting processes. Int. J. Numer. Meth. Eng. 67, 1341 (2006).
4.Flemings, M.C. and Nereo, G.: Macrosegregation. Part 1. Trans. Met. Soc. AIME. 239, 1449 (1967).
5.Flemings, M., Mehrabian, R., and Nereo, G.: Macrosegregation. Part 2. Trans. Met. Soc. AIME. 242, 41 (1968).
6.Mehrabian, R., Keane, M., and Flemings, M.: Interdendritic fluid flow and macrosegregation; influence of gravity. Metall. Mater. Trans. 1, 1209 (1970).
7.Bennon, W.D. and Incropera, F.P.: A continuum model for momentum, heat and species transport in binary solid liquid-phase change systems. 1. Model formulation. Int. J. Heat Mass Transfer 30, 2161 (1987).
8.Rad, M.T., Kotas, P., and Beckermann, C.: Rayleigh number criterion for formation of A-segregates in steel castings and ingots. Metall. Mater. Trans. A 44, 4266 (2013).
9.Tu, W.T., Duan, Z.H., Shen, B.Z., Shen, H.F., and Liu, B.C.: Three-dimensional simulation of macrosegregation in a 36-ton steel ingot using a multicomponent multiphase model. JOM 68, 3116 (2016).
10.Liu, D.R.: Modelling of macrosegregation in steel ingot by weakly integrated micro-macroscopic model. Int. J. Cast Metals Res. 26, 143 (2013).
11.Ge, H.H., Li, J., Han, X.J., Xia, M.X., and Li, J.G.: Dendritic model for macrosegregation prediction of large scale castings. J. Mater. Process. Technol. 227, 308 (2016).
12.Ebisu, Y.: A numerical method of macrosegregation using a dendritic solidification model, and its applications to directional solidification via the use of magnetic fields. Metall. Mater. Trans. B 42, 341 (2011).
13.Liu, W., Xie, C., Bellet, M., and Combeau, H.: 2-Dimensional FEM modeling of macrosegregation in the directional solidification with mesh adaptation. Acta Metall. Sin. 22, 233 (2009).
14.Choudhary, S.K., Ganguly, S., Sengupta, A., and Sharma, V.: Solidification morphology and segregation in continuously cast steel slab. J. Mater. Process. Technol. 243, 312 (2017).
15.Ganguly, S.: Morphology and segregation in continuously cast high carbon steel billets. ISIJ Int. 47, 1759 (2007).
16.Brune, T., Kortzak, K., Senk, D., Reuther, N., and Schaperkotter, M.: A three dimensional model to characterize the centerline segregation in CC slabs. Steel Res. Int. 86, 33 (2015).
17.Long, M.J. and Chen, D.F.: Study on mitigating center macro-segregation during steel continuous casting process. Steel Res. Int. 82, 847 (2011).
18.Long, M.J., Dong, Z.H., Chen, D.F., Liao, Q., and Ma, Y.G.: Effect of uneven solidification on the quality of continuous casting slab. Int. J. Mater. Prod. Technol. 47, 216 (2013).
19.Yang, H.L., Zhao, L.G., Zhang, X.Z., Deng, K.W., Li, W.C., and Gan, Y.: Mathematical simulation on coupled flow, heat, and solute transport in slab continuous casting process. Metall. Mater. Trans. B 29, 1345 (1998).
20.Vertnik, R., Šarler, B., and Senčič, B.: Solution of macrosegregation in continuously cast billets by a meshless method. In IOP Conference Series: Materials Science and Engineering (Aachen, Netherlands, 2011); pp. 16.
21.Li, J., Wu, M.H., Ludwig, A., and Kharicha, A.: Simulation of macrosegregation in a 2.45-ton steel ingot using a three-phase mixed columnar-equiaxed model. Int. J. Heat Mass Transfer 72, 668 (2014).
22.Ma, C., Shen, H., and Huang, T.: Centerline segregation in continuous casting billets. Tsinghua Sci. Technol. 9, 550 (2004).
23.Vušanović, I., Vertnik, R., and Šarler, B.: A simple slice model for prediction of macrosegregation in continuously cast billets. In IOP Conference Series: Materials Science and Engineering (Aachen, Netherlands, 2011); pp. 16.
24.Aboutalebi, M.R., Hasan, M., and Guthrie, R.I.L.: Coupled turbulent-flow, heat, and solute transport in continuous-casting processes. Metall. Mater. Trans. B 26, 731 (1995).
25.Sun, H.B. and Zhang, J.Q.: Study on the macrosegregation behavior for the bloom continuous casting: Model development and validation. Metall. Mater. Trans. B 45, 1133 (2014).
26.Chen, H., Long, M., Cao, J., Chen, D., Liu, T., and Dong, Z.: Phase transition of peritectic steel Q345 and its effect on the equilibrium partition coefficients of solutes. Metals 7, 288 (2017).
27.Launder, B.E. and Spalding, D.B.: The numerical computation of turbulent flows. Comput. Meth. Appl. Mech. Eng. 3, 269 (1974).
28.Long, M.J., Chen, D.F., Wang, Q.X., Luo, D.H., Han, Z.W., Liu, Q., and Gao, W.X.: Determination of CC slab solidification using nail shooting technique. Ironmaking Steelmaking 39, 370 (2012).
29.Matsumiya, T., Kajioka, H., Mizoguchi, S., Ueshima, Y., and Esaka, H.: Mathematical-analysis of segregations in continuously-cast slabs. Trans. Iron Steel Inst. Jpn. 24, 873 (1984).
30.Meng, Y.A. and Thomas, B.G.: Heat-transfer and solidification model of continuous slab casting: CON1D. Metall. Mater. Trans. B 34, 685 (2003).
31.Won, Y.M. and Thomas, B.G.: Simple model of microsegregation during solidification of steels. Metall. Mater. Trans. A 32, 1755 (2001).
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Materials Research
  • ISSN: 0884-2914
  • EISSN: 2044-5326
  • URL: /core/journals/journal-of-materials-research
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords

Metrics

Full text views

Total number of HTML views: 8
Total number of PDF views: 45 *
Loading metrics...

Abstract views

Total abstract views: 247 *
Loading metrics...

* Views captured on Cambridge Core between 19th February 2018 - 16th August 2018. This data will be updated every 24 hours.