Numerical modelling on solidification and heat transfer process of micro-alloyed steel bloom
CAI Dawei1,2, LU Jingzhou3, DOU Kun3, PAN Weiming3
1. Xiangjiang Laboratory, Changsha 410205, Hunan, China; 2. Technology Research Institute, Hunan Iron and Steel Group,Changsha 410004,Hunan,China; 3. School of Metallurgy and Environment, Central South University,Changsha 410083,Hunan,China
Abstract：Aiming at the realistic issues of large variations in casting speed as well as the non-uniform distribution in secondary cooling water, a finite element mathematical model for non-steady state solidification and heat transfer in two-dimensions was established based on the main technical parameters of a micro-alloyed as-cast steel bloom caster. The thermo-physical parameters and solidification characteristics for the target steel was determined using CALPHAD approach. The effects of casting temperature and casting speed on solidification process were discussed by calculated on this basis. The results showed that the increase of casting temperature had relatively small impact on the surface temperature of billet. The center temperature in width increased successively 33.7,28.6 ℃,and the corner temperature increased 21.8,19.1 ℃ along with the casting speed increased from 0.50 m/min to 0.60 m/min. Further research on adjustment of water distribution need to be conducted to improve the phenomenon that excessive temperature recovery still existed.
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