轻、重稀土对球墨铸铁抗衰退性能的影响

Effects of Light and Heavy Rare Earth on Anti-Declining Property of Nodular Cast Iron

系统地研究了不同稀土含量对钇基重稀土镁球铁和铈基轻稀土镁球铁抗衰退性能的影响,得到了各种球化剂处理的铁水球化级别随保持时间的变化关系曲线。结果表明:无论Y Mg Si球化剂还是Ce Mg Si球化剂处理的铁水,随着稀土残量的增加抗衰退时间都延长,但当铁水中的稀土残量达到一定值后,初始球化级别下降;无论Y Mg Si球化剂还是Ce Mg Si球化剂,稀土中等残量(0.04%～0.06%)条件下的抗衰退性能都最好,此时残镁量在0.04%～0.07%;中等稀土残量的稀土镁球化剂的抗衰退性能显著优于镁硅球化剂,而且Y Mg Si球化剂的抗衰退性能优于Ce Mg Si球化剂,Ce Mg Si球化剂在一定条件下同样可以用于大断面球墨铸铁件的生产。

The effects of rare earth elements with different content on antideclining property of Y base heavy rare earthmagnesium and cerium base light rare earthmagnesium nodular cast iron were studied. The relationships between the sphericized grade of the liquid iron treated by different nodulizer and holding time also were obtained. The results show that the more the remainders of the rare earths are, the longer the antideclining time is, either the liquid iron treated by YMgSi or by CeMgSi nodulizer. When the contents of the remainders rare earth are over certain quantity, the primary sphericized grade will decline. When liquid iron treated by YMgSi or CeMgSi nodulizer contains the proper remainders of rare earth (about 0.04%～006%), the antideclining property is the best. Meanwhile, the Mg remainders is about 004%～007%. The rare earthMg nodulizer with middle RE remainders is better than the MgSi in antideclining property. But YMgSi nodulizer with middling reminders of RE is better than the CeMgSi. Sometimes CeMgSi nodulizer can be used for the production of heavy section nodular cast iron with large section.