关键词: 电渣重熔, 稀土, 凝固偏析, 数值模拟, 温度场

Abstract: To investigate the redistribution of rare earths in steel ingots after electroslag remelting,the computational fluid dynamics(CFD)method was employed to simulate the interaction between rare earths and molten steel,heat transfer laws,and solidification segregation during the ingot casting process.Visualization of the temperature field,flow field distribution,and solidification segregation in the ingot was achieved,and the effects of key parameters on rare earth distribution were analyzed.The results show that when the casting temperature increases from 1 550 ℃ to 1  650 ℃,the rare earth segregation in all parts of the steel ingot decreases to varying degrees,among which the horizontal radius of the segregation zone with a mass fraction of 0.075% at the upper center is reduced by approximately 0.01 m. When the molten steel inlet flow rate increases from 11.66 t/min to 13.60 t/min,the central segregation is significantly reduced,with the horizontal coverage of the segregation zone above 0.06% at the top narrowed by about 0.02 m. When the mass fraction of rare earth addition amount increases from 0.048% to 0.08%,the horizontal radius of the top segregation zone widens by approximately 0.15 m.

Key words: electroslag remelting, rare earth, solidification segregation, numerical simulation, temperature field