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Nucleation and Early Growth Pertinent to Near Net Shape Casting

机译：与净形状铸造附近有关的成核和早期生长

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Twin-roll continuous casting technology is rapidly approaching commercialisation. Fundamentally different than conventional continuous casting, heat transfer and hence solidification during twin-roll casting are governed by the interfacial melt/mould thermal resistance, as opposed to the resistance of the solidifying shell. Under these conditions the interface resistance is predominantly controlled by the melt/substrate wetting behaviour. The very early stages of melt/mould contact are characterised by highly transient heat transfer conditions. The overall melt cooling rates prior to the formation of the first solid are reported to be in the range of 1000 - 50000 K/s with melt undercoolings of up to 300 K. At the points of intimate melt/mould contact the thermal resistance is approaching zero, where cooling rates and undercooling much larger than those reported in the literature are probably occurring. Improved wetting will reduce the energy barrier for nucleation while at the same time increasing the cooling rate of the liquid. Since the overall nucleation rate is controlled both by the rate of cluster formation and the rate of atom transfer to the nucleus, a critical cooling rate will exist above which the nucleation rate is expected to be reduced. Under these conditions, it is possible that the first solid phase to form is a metastable glass which subsequently transforms into a crystalline phase. The implications on nucleation and early growth are also discussed.
机译：双辊连铸技术正在快速接近商业化。基本上与常规连续铸造，热转印和在双辊铸件期间的凝固是由界面熔体/模具热阻的管辖，而不是固化壳的电阻。在这些条件下，界面电阻主要由熔体/衬底润湿行为控制。熔体/模具接触的早期阶段的特征在于高瞬态传热条件。据报道，在形成第一固体之前的整体熔融冷却速率在1000-50000k / s的范围内，熔体过冷高达300k。在紧密熔体/模具接触点处，热阻即将到来零，其中冷却速率和过冷比在文献中报告的那些大得多。改进的润湿将减少用于成核的能量屏障，同时增加液体的冷却速率。由于通过簇形成的速率和原子转移到核的速率来控制整体成核速率，因此临界冷却速率将存在于预期降低成核速率。在这些条件下，形成第一固相是形成的亚稳态玻璃，其随后转化为结晶相。还讨论了对成核和早期增长的影响。

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