连续定向凝固中临界牵引速度及其相关因素

Critical Pulling Velocity and Its Effect Factors during Continuous Unidirectional Solidification

通过对连续定向凝固过程的传热理论分析，建立了临界牵引速度与其相关因素之间的关系式。当喷水位置到固液界面距离Ｌ≤１０ｍｍ时，纯Ａｌ和Ａｌ－１％Ｃｕ合金计算结果与实验数据基本吻合。由此而确定的各种参数之间能够达到很好的相互匹配，可确保连续定向凝固的稳定进行。还通过分析各种因素对临界牵引速度的影响，提出了提高临界牵引速度的途径。

The relation between critical pulling velocity and its effect factor is made by heat transport theoretical analyzing of continuous unidirectional solidification. When the distance of spraying position of forced cooling ingot and the liquid-solid interface is shorter than 10 MM.(L ≤10 mm),the calculated result of Al and Al-1% Cu alloy continuous unidirectional solidification is approximately identical with experimental result. All of calcu- lated and experimental parameters are quiet matching, and the continuous unidirectional solidification can be stably performed. The way of raising pulling veloc-ity is also mentioned.