耐热球铁排气歧管用球化剂的配制  

Preparation of Nodualrizing Alloy Used for Heat-Resistant Nodular Iron Exhaust Manifold

作　　者：王迎战 马云昭 赵新武 袁森[3] 

机构地区：[1]禹州市恒利来合金厂,河南禹州461670 [2]西峡县内燃机进排气管有限责任公司,河南西峡474500 [3]西安理工大学,陕西西安710048

出　　处：《现代铸铁》2011年第A02期60-64,共5页Modern Cast Iron

摘　　要：介绍了球铁排气歧管铸件的结构特点、对材料的要求及铸造工艺要点。分析了球化剂中Mg、RE、Ba、Ca、Bi和Sb等元素的作用。为确保铸件球化率高、石墨球细小、铁素体基体中不出现碳化物,研制了高效低RE合金球化剂。采用该球化剂生产的QTRSi4Mo1排气歧管铸件与采用FeSiMg7RE3合金球化剂生产的相比,消除了渗碳体、细化了石墨球、3.2 mm薄壁处和厚壁处的铸态珠光体体积分数可以分别有效地控制在15%和10%以内。The configuration characteristics,material requirement and casting process outline of the nodular iron exhaust manifold was introduced.The effects of Mg、RE、Ba、Ca、Bi and Sb in the nodualrizing alloy were analyzed.In order to ensure the castings having high nodularity,small graphite size and carbide-free matrix,a new type of low-RE high effective nodularizing alloy was developed.Compared with using FeSiMg7RE3 alloy,as the result of using the new nodularizing alloy to produce QTRSi4Mo1 grade nodular iron manifold,the carbide was eliminated,the graphite size was reduced,the as-cast pearlite volume fraction could be effectively controlled less that 15% in the 3.2 mm section and 10% in the thick section respectively.

关 键 词：耐热球铁 排气歧管 高效低稀土合金球化剂 球化处理 

分 类 号：TG255[金属学及工艺—铸造]