二次孕育及终硅量对铸态铁素体球墨铸铁组织性能的影响  

Effect of Last-Silicon Content on Microstructure and Mechanical Properties of Ferrite Ductile Iron Obtained by Secondary Inoculation

作　　者：夏青[1] 姚俊邦 杨涤心[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]中信重型机械公司,河南洛阳471003

出　　处：《河南科技大学学报（自然科学版）》2006年第5期1-4,共4页Journal of Henan University of Science And Technology:Natural Science

基　　金：河南省自然科学基金项目(0424290064);河南科技大学科学研究基金项目(2004Zy049)

摘　　要：将铸态球墨铸铁经退火处理生产铁素体球墨铸铁的工艺复杂、周期长。本研究进行了调整终硅量及采用二次瞬时孕育处理工艺直接得到铸态铁素体球墨铸铁的试验。结果表明，采用稀土镁球化剂和硅铁孕育剂，对铁液进行立即孕育、立即浇注的瞬时孕育处理，并控制终硅量为2.95％～2.99％，可直接获得铁素体球墨铸铁，石墨球径仅为0．019～0．017mm，球化级别提高至3～2级，铁素体量多达88．4％～94．7％，力学性能完全达到国家标准。At present,the fabricating of ferrite ductile iron by heat treatment exhibits some problems such as complex process and long production period.In this paper,the ferrite ductile iron was obtained by secondary instantaneous inoculants and the effect of last-silicon content on its microstructure and properties were investigated.The results show that by controlling the ferrite ductile iron with final silicon content 2.95~2.99%,the graphite size is 0.019~0.017mm in diameter.The graphite nodularization degree increasing up to 2~3 grades with ferrite content of 88.4~94.7% can be directly produced by the instantaneous inoculants and casting.The mechanical properties of ferrite nodular cast iron agree with the requirement of the national-specified standard.

关 键 词：铁素体球墨铸铁 终硅量 瞬时孕育处理 显微组织 力学性能 

分 类 号：TG255[金属学及工艺—铸造]