Journal of Northeastern University Natural Science ›› 2020, Vol. 41 ›› Issue (9): 1257-1261.DOI: 10.12068/j.issn.1005-3026.2020.09.007

• Materials & Metallurgy • Previous Articles     Next Articles

Numerical Simulation of Solidification Process During Vertical Continuous Casting

WANG Zhuo, LI Bao-kuan, LIU Zhong-qiu, NIU Ran   

  1. School of Metallurgy, Northeastern University, Shenyang 110819, China.
  • Received:2020-02-21 Revised:2020-02-21 Online:2020-09-15 Published:2020-09-15
  • Contact: LI Bao-kuan
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Abstract: Solidification process in a vertical continuous casting was numerically simulated using a three-phase (mixed liquid-columnar-equiaxed grain) solidification model based on Eulerian-Eulerian approach and metal/alloy solidification theory. Comparing with the single-phase solidification model, more detailed phenomenons in addition to the thermo-solute natural convection are predicted, such as the evolutions of columnar and equiaxed grains, floatation/sedimentation of equiaxed grains can be predicted, which greatly affects the macroscopic solute transport and development of as-cast structure. The simulation results show that negative segregation occurs in the center of the billet, which filled with deposited equiaxed grains and next to this center, a ribbon segregation regions are observed. With the increasing superheat of molten steel, the region of equiaxed grain decreases and the macrosegregation at the center increases.

Key words: continuous casting, macrosegregation, grain sedimentation, columnar grain, solidification structure

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