大型离心球铁铸管的组织和性能  

Microstructure and mechanical properties of large diameter centrifugal casting ductile iron pipe

作　　者：刘宗昌[1] 王振国[1] 朱文方 陈龙 

机构地区：[1]包头钢铁学院材料与冶金工程系,内蒙古包头014010 [2]抚顺特殊钢有限责任公司,辽宁抚顺113001

出　　处：《包头钢铁学院学报》2002年第1期27-30,共4页Journal of Baotou University of Iron and Steel Technology

摘　　要：从大型离心球墨铸铁管上取样 ,用光学金相、电子金相法研究了铸造和不同退火状态下的离心球墨铸铁的组织 ,实行了低温退火新工艺 研究表明 ,采用低温退火 ,使片状珠光体转变为粒状珠光体 ,并且控制粒状珠光体的质量分数为 15 %～ 2 5 % ,其余为铁素体 +石墨 。Microstructure of centrifugal casting ductile iron and its microstructure after different annealing processes were investigated by means of optical and electronic metallography.All samples come from large diameter centrifugal casting ductile pipes.A new low temperature annealing process was carried out.The result shows that the plate pearlite has transformed granular pearlite after a low temperature annealing process,the quantity of granular pearlite is confined from 15 percent to 25 percent,the other is ferrite and graphite.This kind of microstructure reveals sound comprehensive mechanical properties.

关 键 词：球墨铸铁 离心铸管 珠光体 石墨 

分 类 号：TG143.5[一般工业技术—材料科学与工程]