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通过建立425mm×320mm连铸大方坯二维凝固传热数学模型,模拟了凝固坯壳的长大过程,并通过窄面射钉实验对数学模型进行了验证,精确得到了任意位置处大方坯凝固坯壳的厚度分布情况及最终凝固终点的位置,发现经典的凝固平方根定律对于连铸大方坯的凝壳长大进程不再适用.回归宽面中心坯壳厚度与凝固时间平方根的关系式发现,结晶器弯月面至二冷区出口,近似为线性关系,符合平方根定律,二冷区出口至凝固终点,二者为非线性关系,不再符合平方根定律.
Through the establishment of a two-dimensional solidification heat transfer mathematical model of 425mm × 320mm continuous casting bloom, the growth process of the solidified shell was simulated and the mathematical model was verified by the narrow-face nailing experiment. The solidification of the bloom at any position The distribution of the thickness of the shell and the position of the final solidification point indicate that the classical law of the square root of the solidification is no longer suitable for the growth of the shell of the continuous casting bloom.Relationship between the thickness of the center of the wide face and the square root of the setting time shows that, The exit from the mold meniscus to the second cooling zone is approximately linear, complying with the law of square root and the exit from the second cooling zone to the freezing point. The two are nonlinear and no longer meet the square root law.