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Origin of Heat Transfer Anomaly and Solidifying Shell Deformation of Peritectic Steels in Continuous Casting

机译:连铸包晶钢传热异常的产生与凝固壳形变。

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The effect of carbon content of steel melt on the heat transfer in a continuous casting mold was investigated in a laboratory scale mold by simultaneous measurements of the heat flux during solidification of the melt and shrinkage of the resulting shell during solidification and cooling. For peritectic medium carbon steels, the heat flux on the mold surface was subject to an anomalous decrease, since the surface roughness of the shell was substantial, providing an air gap at the shell/mold interface. For ultra low carbon steels, however, the heat flux was large in spite of the fact that surface roughness was also significant. For peritectic medium carbon steels, the deformation of the shell caused by the shrinkage due to δ/γ transformation during and just after solidification is responsible for the formation of the surface roughness, resulting in the heat transfer anomaly. On the contrary, the surface roughness for ultra low carbon steels is formed later on the shell after solidification during cooling, and hence it does not decrease the heat flux at the initial stage of solidification.
机译:在实验室规模的铸模中,通过同时测量熔体凝固过程中的热通量以及凝固和冷却过程中所得壳的收缩率,研究了钢液中碳含量对连铸结晶器传热的影响。对于包晶中碳钢,模具表面的热通量会异常降低,因为壳体的表面粗糙度很大,从而在壳体/模具界面处提供了气隙。然而,对于超低碳钢,尽管表面粗糙度也很明显,但热通量仍然很大。对于包晶中碳钢,由于凝固过程中和刚凝固后由于δ/γ相变引起的收缩而引起的壳体变形是表面粗糙度的形成原因,从而导致传热异常。相反,超低碳钢的表面粗糙度在冷却过程中的凝固之后在壳体上形成得较晚,因此不会降低凝固初期的热通量。

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