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稀土元素加入钢中能够改善钢的浇注性能。其中包括提高钢液的流动性,降低钢的收缩率及热裂倾向、提高钢的凝固速度等。同时,稀土元素能使铸钢的结晶组织得到改善,缩小柱晶区,扩大等轴晶区,减少铸钢的偏析及其它缺陷。本文综述了国内外该领域的研究结果,并讨论了稀土元素在钢液浇注凝固过程中的作用机理。
The addition of rare earth elements to steel can improve the casting properties of steel. Including the liquid steel to improve mobility, reduce the shrinkage of steel and hot cracking tendency to improve the solidification rate of steel and so on. At the same time, rare earth elements can make the cast steel crystal structure is improved, narrow columnar zone, expanding the equiaxed zone, to reduce the segregation of castings and other defects. This paper reviews the research results in this field at home and abroad, and discusses the mechanism of rare earth elements in the solidification process of molten steel pouring.