运用非Fourier传热理论建立了金属快速凝固过程中的非平衡传热理论模型,包括非Fourier方程的建立、传热与相变模拟.模拟计算表明:(1)在溅射激冷条件下,界面换热系数越大,界面冷却速度和移动速度也越高.在界面换热系数相同时,计算得到的界面冷却速度随着固-液界面高度的提高呈现先上升而后下降的变化趋势;计算得到的冷却速度值明显小于Fourier定律的计算值.(2)在激光加热条件下,计算的界面移动速度在凝固开始时先急剧增加,然后渐趋平稳.计算还表明,金属的过热度及过冷度与其热物性相关.
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