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基于ANSYS软件建立了310mm×360mm断面大方坯连铸过程二维凝固传热数学模型,通过窄面射钉试验及铸坯表面测温对模型的准确性进行了验证,模拟了不同碳含量的高碳耐磨球钢大方坯宽面和窄面凝固坯壳的生长。结果表明模型能精确地获得不同工况下任意位置凝固坯壳的厚度分布、凝固终点位置及铸坯中心固相率;发现不同碳含量的高碳耐磨球钢具有相同的凝固规律:结晶器弯月面至二冷区出口,相应的铸坯柱状晶区凝固坯壳厚度与凝固时间的平方根呈线性关系,符合平方根定律,并对平方根定律进行了修正,修正项与过热度有关;二冷区出口至凝固终点,相应的铸坯等轴晶区凝固坯壳厚度与凝固时间的平方根呈非线性关系,不再符合平方根定律。
Based on the ANSYS software, the two-dimensional solidification heat transfer mathematical model of continuous casting of 310mm × 360mm section was established. The accuracy of the model was verified by the narrow-surface nailing test and the surface temperature measurement of the slab. Simulations of high carbon content Growth of carbon-resistant ball steel bloom and narrow-faced solidified shell. The results show that the model can accurately obtain the solidification shell thickness distribution, the solidification end position and the solid fraction of the slab at any position under different working conditions. It is found that the high carbon wear-resistant ball steel with different carbon content has the same solidification rule: From the meniscus to the exit of the second cooling zone, the thickness of the solidification shell and the square root of the solidification time in the columnar zone of the corresponding slab have a linear relationship with the square root law, and the square root law is corrected. The correction term is related to the superheat; District exit to the end of solidification, the corresponding slab equiaxed zone solidified shell thickness and solidification time square root of a nonlinear relationship, no longer consistent with the square root law.