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采用数值模拟与工业试验相结合的研究方法,分析中间包在换包后包内夹杂物颗粒在非等温条件下的运动行为。研究结果表明,换包后,钢中不同尺寸的夹杂物有分离趋势,且小于50μm夹杂物的去除条件逐渐变差。在浇注中后期,小于50μm夹杂物倾向于跟随流体沿中间包底部流出中间包,夹杂物的去除效果进一步变差。工业试验结果表明,通过在中间包底部吹入氩气的方式,改善了换包后夹杂物去除的不利影响。中间包底吹氩气前,大于50μm夹杂物的数量密度为0.008 8个/mm~2;中间包底吹氩气后,铸坯中大于50μm夹杂物的数量密度为0.002 5个/mm~2。
Using the research method of numerical simulation and industrial experiment, the movement behavior of inclusion particles in the tundish after the tundish was changed under non-isothermal conditions was analyzed. The results show that the inclusions with different sizes in steel tend to segregate after the changeover, and the removal conditions of inclusions less than 50μm are getting worse. In the late stages of casting, inclusions smaller than 50 μm tend to follow the fluid flow out of the tundish along the bottom of the tundish, further deteriorating the inclusion removal. Industrial test results show that the adverse effect of removal of inclusions after package change is improved by blowing argon gas into the bottom of the tundish. Before the bottom of the tundish blowing argon, the number density of inclusions larger than 50μm was 0.008 8 / mm ~ 2. After the bottom of the tundish was blown with argon, the number density of inclusions larger than 50μm was 0.002 5 / mm ~ 2 .