铸态QT800-5悬挂支架铸件的研制  

Development of QT800-5 Suspension Bracket Castings

作　　者：张军[1] 汪金飞[1] 郑言彪 李志华[1] 孙金明[1] 陶汉德[1] 

机构地区：[1]湖北省机电研究设计院股份公司,湖北武汉430070

出　　处：《现代铸铁》2016年第5期28-30,共3页Modern Cast Iron

摘　　要：介绍了铸态高强度、高韧性球墨铸铁QT800—5悬挂支架的研制情况，主要技术措施是：（1）选用高c、低P、低s的优质球铁生铁；（2）加人少量的Cu、Mo、Sb等合金元素进行复合强化；（3）球化剂选用FeSiMg8RE3，包内孕育剂选用75SiFe，二次孕育及随流孕育采用自行配制复合孕育剂；（4）球铁原铁液的化学成分控制为：加（C）3．6％～3．8％，w（Si）2．5％～2．8％，w（Mn）0．25％～0．45％，w（S）〈0．02％，w（P）〈0．03％，w（Cu）0．2％．0．4％，w（Mo）0．1％～0．3％，w（Sb）0．01％～0．02％。试验结果表明：珠光体体积分数超过95％，含有少量铁素体，石墨球化良好，石墨球细小且均匀，力学性能检测数据符合技术要求。The development of casting high strength and toughness QTS00-5 nodular iron suspension bracket was introduced. The main technical measures were as follows： （1）Good quality nodular iron with high C,low P and low S was used. （2）A small amount of Cu, Mo, Sb and other alloying elements were added as strengthen compound.（3）FeSiMg8RE3 was used as the nodularizing agent,75SiFe was the inoculant in ladle,and self-prepared compound inoculant were using in secondary inoculation and concomitant with the flow inoculation. （4）The chemical composition of nodular iron liquid was controlled as w（C） 3.6%-3.8%,w（Si） 2.5%-2.8%,w（Mn） 0.25%-0.45%,w（S）〈0.02%,w（P）〈0.03%,w（Cu） 0.2%-0.4%,w（Mo） 0.1%-0.3%,w（Sb） 0.01%-0.02%. The results shown that the volume fraction of pearlite was more than 95%. The structure contained a small amount of ferrite. Good nodularized graphite were small and well distributed. Testing data of mechanical properties meet the technical requirements.

关 键 词：铸态球铁 悬挂支架 多元素合金化 

分 类 号：TG255[金属学及工艺—铸造]