Thermal resistance at the interface between mold flux film and mold for continuous casting of steels
Thermal resistance at the interface between mold flux film and mold for continuous casting of steels
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DOI：
10.2355/isijinternational.38.440
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发表时间：
1998-01-01
影响因子：
1.8
通讯作者：
Suzuki, M
中科院分区：
文献类型：
--
作者：
Cho, J;Shibata, H;Suzuki, M
结晶器弯月面附近凝固壳向结晶器的传热是导致连铸坯表面裂纹形成的重要原因。结晶器保护渣膜与结晶器界面处的热阻对传热影响很大。据此，建立了钢壳/结晶器毛膜/铜模模型系统，模拟了连铸结晶器内弯月面附近的传热过程，并通过在模拟器上测量铜模内的温度梯度来确定热阻。界面热阻随着焊剂膜厚度的增加而增加，这与其他人先前的观察相反，他们假设界面热阻对于不同的焊剂膜厚度是恒定的。发现界面热阻约占传热总热阻的50%。结晶温度较高的中碳钢保护渣的热流密度低于低碳钢保护渣，这不是由于保护渣的辐射传热减少，而是由于在相同的保护渣膜厚度下，保护渣的界面热阻较高。这是由于两种焊剂之间结晶行为的差异，例如结晶层的生长速率。
Heat transfer from solidifying shell to mold near the meniscus plays an important role for the formation of surface cracks on continuously cast steel products. The heat transfer is influenced substantially by the thermal resistance at the interface between mold flux film and copper mold. Accordingly,a model system consisting of steel shell/mold fur film/copper mold is built to simulate the heat transfer near the meniscus in the mold for continuous casting, and the thermal resistance is determined by measuring temperature gradient in the copper mold in the simulator. The interfacial thermal resistance increases with increasing flux film thickness in contrast to previous observation by others who assumed that the interfacial thermal resistance is constant for different flux film thickness. The interfacial thermal resistance is found to be about 50% of overall thermal resistance for the heat transfer.;Mold fluxes for medium carbon steel with higher crystallization temperatures show lower heat flux than those for low carbon steel not due to reduced radiative heal transfer but due to higher interfacial thermal resistance at the same flux film thickness. This arises from the difference in crystallizing behavior such as growth rate of crystalline layer between the two fluxes.