solidification value

For the moment, we see little of study on the thermal fatigue performance of Al-Cu unidirectional solidification, especially the systemic study. Therefore, this subject has considerable great practical application value.

而目前对Al-Cu定向凝固合金热疲劳性能的研究进行得很少，系统的研究更加少见报道，因此，本课题具有相当的实际研究价值。

Holding time also has a little of effect on initial precipitation temperature of all kinds of phases in the Al-Si alloy, the solidification caloric value changes from small to big and then to small as the holding time extends.

保温时间对Al-Si合金内各相初始凝固温度的影响也很小，而凝固焓变值随保温时间的延长经历了由小变大再变小的过程。

It provide a scientific basis for the electrode melting velocity control and the temperature control of the ingot solidification process, and have a certain value for the actual production.

本文采用的研究方法为目前国内铸造行业研究的热点，为电极熔速的控制和钢锭凝固过程温度控制、结晶器设计等提供了科学依据，对实际生产工程有一定的应用价值。

Adjustment of the after-solution temperature and the solidification bath temperature may improve the structure and morphology of the product, which can be explained with the concept of residual ester value. This shows that the selected technological parameters are reasonable.

通过溶解温度和凝固浴温度的调整，可以改善产品的结构形态，并用剩余酯化度的概念解释了二者之间的关系，证明了工艺参数选择的合理性。