论文部分内容阅读
自淬火快速凝固过程是将高能量密度的激光速或电子速照射还动固体,使其表面局部区域迅速熔化,然后通过未熔基体的热传导将热量迅速带走而完成快速凝固。凝固过程的热状态决定了自淬火熔化区域的几何形状、温度梯度、冷却速度等工艺参数,而这些工艺参数又对材料的显微组织及性能有重要影响。由于整个凝固过程在很短时间和很小的局部区域内完成,
Rapid self-quenching solidification process is the high energy density laser speed or electron velocity of the irradiated solid, the surface of the rapid melting of the local area, and then through the heat transfer of unmelted matrix quickly remove the heat to complete the rapid solidification. The thermal state of the solidification process determines the geometry, temperature gradient, cooling rate and other process parameters of the self-quenching melting zone, and these process parameters have an important influence on the microstructure and properties of the material. Since the entire solidification process is completed in a very short time and a small local area,