摘要
利用光学显微镜和扫描电镜并结合电子探针和化学分析,研究了稀土在离心灰铸铁管中的作用。结果表明,在保证灰口铸铁的先决条件下,普通离心灰铸铁管的组织,尽管可随基本化学成分和铸造条件的不同而变化,但其特征是组织粗大且很不均匀,并有明显的分层现象。加入微量稀土后,无论显微组织和宏观组织都显著趋于细化和均匀化,同时,化学成分的偏析也有明显改善。
By means of OPM, SCM, EP and chemical analysis, the role of RE in centrifugal-casting grey cast iron pipes is studied. The results show that the structures are rery course and heterogeneous in glay cast iron pipes for ordinary centrifugal-casting. When a suitable quantity of RE is added into the melt during pouring, both the macro-and microstructures become fine and homo-geneous,and the degree of chemical segregation is also considerably reduced.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
1991年第6期526-532,共7页
Journal of University of Science and Technology Beijing
关键词
灰铁
稀土
离心铸管
管材
铸造
RE grey cast iron, centrifugal-casting pipe, structure
