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采用ANSYS软件对薄板坯连铸机漏斗型结晶器内钢液的凝固过程进行模拟,分析拉坯过程中坯壳的热应力状况,并引入了成裂指数的概念。研究表明,当拉速为4.0 m/min,过热度在14℃时,铸坯越接近结晶器出口时,裂纹越易产生于坯壳宽面中心位置;过热度对薄板坯在结晶器内热应力场的分布影响不大;在钢液凝固初期,适当提高拉速有利于减少角部产生裂纹的可能性。
The solidification process of molten steel in the funnel mold of thin slab caster was simulated by ANSYS software. The thermal stress state of the shell during the drawing process was analyzed and the concept of cracking index was introduced. The results show that when the casting speed is 4.0 m / min and the degree of superheating is 14 ℃, the closer the slab is to the exit of the mold, the more the crack is likely to occur in the center of the wide face of the shell. The superheat affects the thermal stress Field distribution has little effect; in the initial liquid steel solidification, the appropriate increase in casting speed is conducive to reducing the possibility of cracks in the corner.