| In this study,the research object is the carbon steel continuous casting billet is the initial solidification.The finite element software The solidification process of molten steel in the mold is simulated,and the process conditions are explored from the two aspects of drawing speed and superheat.The influence of billet quality and the coupling model combined with the simulation of the microstructure of the cross-section dendrites of the continuous casting billet.Then based on the cellular automata method,the C++6.0 programming software is used to simulate the primary dendrite growth of the initial solidification on the carbon steel crystal wall.Finally,the calculation results are visualized to analyze the evolution of dendrite growth.The result shows that with the increase of the pulling speed and the superheat degree,the initial shell thickness of the low carbon steel of the mold can be reduced.When the degree of superheat is increased by 1 °C,the thickness of the shell decreases by 0.0825 mm on average,when the pulling speed increases by 1 m/min,the thickness of the shell decreases by an average of 3.146 mm.By comparasion,the influence of superheat is small,and the change of the pulling speed has a greater influence on the thickness of the shell.Finally,at a certain pulling speed,the simulation result shows that for every 1 °C increase in superheat,the secondary dendrite arm spacing is increased by 0.05 ?m.Therefore,in the actual process,lower superheat and reasonable pulling speed should be selected,which is helpful to improve the efficiency of continuous casting.With the increase of undercooling,the growth rate of primary dendrites increases significantly,and when the growth time of dendrites is 0.02 s,primary dendrite arm appears.When the growth time is 0.04 s,secondary dendrite buds are produced.When the time is 0.06 s,the secondary dendrite arms are more developed.When the growth time is 0.1 s,three dendritic arms appear. |
PDF Full Text Request