主要是明显的尺寸效应和凝固、收缩、应力等问题，避免或减少铸铁井盖的成分偏析、变形、开裂等缺陷的产生。
Is mainly the size effect and solidification, shrinkage, stress and other issues clearly, to avoid or reduce the segregation, iron manhole cover deformation and crack defects.
分析了快速凝固的非平衡效应及形成机制的研究进展，指出了现有理论的局限性。
Research progress and the limitation of non-equilibrium effect of rapid solidification and its formation mechanism are analysised.
在离心浇铸金属凝固过程中，采用动态效应的方法对以达到细化晶粒的目的。
A method of dynamic action was used during the solidification of the alloy in centrifugal casting.
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