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一、稀土在铸铁中的作用稀土元素能改变铸铁中的石墨形态,提高铸铁机械性能。主要有以下几点作用: 1.能去硫和净化铁水,提高铁水表面张力,使石墨成球状或蠕虫状。 2.能克服反球化元素砷、锑、铋、钛的不利作用,使球化稳定。 3.能细化晶粒、强化基体并改变碳化物的形态与分布。 4.提高铁水流动性,改善铸造性能。
First, the role of rare earth in cast iron Rare earth elements can change the graphite morphology in cast iron to improve the mechanical properties of cast iron. The main effect of the following points: 1. To sulfur and purification of molten iron to improve the hot metal surface tension, graphite into a ball or worm-like. 2. To overcome anti-nodular elements arsenic, antimony, bismuth, titanium adverse effects, so that the ball stability. 3. Can refine the grain, strengthen the matrix and change the shape and distribution of carbide. 4. Improve the mobility of molten iron, improve casting performance.