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基于凝固—传热学基本理论,建立板坯连铸三维凝固传热数学模型。该模型考虑了组元成分、固相分数、温度等因素对热物性参数的影响,根据糊状区溶质传输和反扩散理论,采用钢中多组元成分的百分含量计算液、固相线温度。以鞍钢第一炼钢厂厚板坯连铸机为对象,根据二冷区铸坯表面实际水流密度分布和辊子接触传热建立边界条件,计算整个铸坯任意点、线、面的温度及固相分数分布。多钢种多拉速条件下铸坯表面温度实测值和射钉实验结果与计算值吻合良好。
Based on the basic theory of solidification - heat transfer, a mathematical model of solidification and heat transfer in slab continuous casting is established. The model takes into account the influence of component composition, solid fraction, temperature and other factors on the thermophysical parameters. According to the theory of solute transport and anti-diffusion in the mushy zone, temperature. Based on the actual flow density distribution of the slab surface in the second cooling zone and the contact heat transfer of roller, the temperature and solidification of the entire slab at any point, line and surface are calculated. Phase fraction distribution. The test results of the surface temperature of the billet and the nailing test under the conditions of multi-steel and multi-casting speed are in good agreement with the calculated values.