树枝状晶组织的形成在很大程度上决定了铸件的特性。可以有目的地控制抗拉强度、延展性、抗热冲击稳定性和组织的均匀性。人们从四个方面研究了树枝状晶的形成。 1.生长的树枝状晶体顶端的形状(曲率半径R,形态稳定性) 2.树枝状晶的顶端温度T 3.初生晶枝间距e 4.次生晶枝间距d 本文就后两个问题进行探讨,由于后者对工艺性能具有重要意义,故首先研究 Dendrite formation largely determines the properties of the castings. Tensile strength, ductility, thermal shock stability and tissue uniformity can be purposefully controlled. People from four aspects studied the dendrite formation. 1. The shape of the top of the growing dendrites (radius of curvature R, morphological stability) 2. The tip temperature of the dendrites T 3. The spacing of the primary dendrites e 4. The secondary dendrite spacing d This article addresses the latter two issues, Since the latter is of great importance to process performance, it is first studied