高性能合成灰铸铁的凝固与组织分析  

Study on Solidification and Microstructure of High Strength Synthetic Gray Cast Iron

作　　者：任昉[1] 郭学锋[2] 

机构地区：[1]河南理工大学经济管理学院,河南焦作454000 [2]河南理工大学材料科学与工程学院,河南焦作454000

出　　处：《热加工工艺》2016年第13期36-40,45,共6页Hot Working Technology

基　　金：河南省科技攻关项目(102102210031)

摘　　要：采用500kg中频感应炉熔化,生产条件下对比研究了普通和合成铸铁的组织。加入0.3%FeSi75+0.3%稀土锶钡复合孕育剂,普通铸铁基体组织为>98%P+~2%F,石长0.19~0.29 mm,共晶团500个/cm^2,γ_(初生)占截面面积的50%。采用加入0.6%FeSi75普通孕育处理工艺,以60wt%(70wt%)废钢结合增碳熔炼的合成铸铁,基体组织为95%P+5%F(90%P+10%F),石长0.08~0.16 mm(0.06~0.15 mm),共晶团>1000个/cm^(>1040个/cm^2),发达的网状γ_(初生)占截面面积的80%(>80%)。合成铸铁形成这种优异组织,是由于特殊的液态不均匀原子团簇组结构改变了铸铁传统凝固模式所致。Based on the results obtained in laboratory, ordinary cast iron and synthetic cast iron with different melting processes were studied and contrasted under production condition in a foundry workshop. The cast irons were melted in an intermediate frequency induction furnace with melting capacity of 500 kg. Gray cast iron with conventional charges, melting processes and 0.3%FeSi75＋0.3% （RE-Sr-Ba） complex inoculation had a microstructure with mixture matrix of 〉98%P＋-2%F, graphite length was between 0.19 and 0.29 ram, and eutectic cells had 500/cm^2. After special etching, 50% area of the cross section of the cast ingot was occupied by primary y phase. Synthetic gray cast iron with 60% （70%） scrap steel charges, furnace carbon pickup and 0.6%FeSi75 ordinary inoculation had a microstructure of〉95%P＋-5%F （90%P＋10%F）, graphite length was between 0.08 and 0.16 mm （0.06 - 0.15 mm）, eutectic cells had 〉 1000/cm^2 （〉 1040/cm^2）, and cross section area of the cast ingot was 80% y （〉80%y）. The forming of this unique microstructure of the synthetic gray cast iron was due to the different solidification modes compared with conventional processes. The new solidification mode was due to the special inhomogeneous atomic clusters existing in melt.

关 键 词：合成铸铁 共晶团 枝晶 孕育处理 团簇 

分 类 号：TG143.2[一般工业技术—材料科学与工程]