稀土对可锻铸铁石墨化的影响

Affection of RE to the Graphitization—process of Malleable Cast Iron

可锻铸铁有一定的强度及延伸率,跟灰铸铁和球墨铸铁相比,能利用大量廉价的废钢,成本低于球铁,炉前铁水处理比球铁简单。但不足之处是可锻铸铁有一个较长的石墨化退火过程。如何缩短这一过程,是铸造工作者们正在积极探索的重点。为了寻找快速退火的途径,我厂用稀土硅铁对可锻铸铁原铁水进行孕育,在这方面做了一些试验。

This paper states through experements, alloy of RE—Si may be promote graphitization—process of malleable cast iron by means of its addition to the original molten iron. Besides, it makes finer microstructure and higher mechanical properties of castings.