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采用有限元法,建立了大方坯凝固传热过程的数学模型。基于射钉试验验证了该模型的正确性。基于该凝固模型,分析了中心固相率与不同定义下凝固率的关系,提出了中心固相率在0~0.2范围内作为末端电磁搅拌的合理位置,适用于所有钢种;而面积凝固率在0.6~0.8范围内作为末端电磁搅拌的合理位置,只适用于高碳特殊钢。工业性生产试验进一步验证了这一观点,并取得了较好的冶金效果。
Using finite element method, the mathematical model of the solidification heat transfer process of the bloom was established. The model is validated based on the nailing test. Based on the solidification model, the relationship between the solid fraction of the center and the solidification rate under different definitions was analyzed, and the reasonable solidification rate of the central solid fraction within the range of 0-0.2 was proposed as the end electromagnetism agitation for all steel types. The area solidification rate In the 0.6 ~ 0.8 range as the end of electromagnetic stirring reasonable position, only applies to high carbon special steel. Industrial production test to further verify this view, and achieved good metallurgical results.