Abstract: In the solidification process, the central segregation of the billet is inevitable. In order to study the influence of different casting speeds on the quality of the billet, a two-dimensional flow-heat-solute transfer coupling model based on the OpenFOAM open-source software was established in this paper. The 230x280mm2 of the billet with U71Mn were simulated at different casting speeds of 0.95m/min, 1m/min and 1.05m/min. The mechanism segregation of the billet was revealed. Numerical results showed that the central segregation degree of the billet with different casting speeds were 1.17, 1.04 and 1.15 by calculation. The experimental results showed that the central segregation of the billet with different casting speeds were 1.17, 1.03 and 1.15, respectively. The mathematical model was proved to be accurate by the results of the experiments. Therefore, the segregation degree of the billet was best than the others when the casting speed of the billets was at 1m/min.
Authors: Haitao Ma, Jiongming Zhang, Rong Cheng, and Zhaozhao Yan
Keywords: Numerical Simulation; The billet; Segregation; Different casting speeds