The Role of RE in Centrifugal-Casting Grey Cast Iron Pipes
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摘要: 利用光學顯微鏡和掃描電鏡并結合電子探針和化學分析,研究了稀土在離心灰鑄鐵管中的作用。結果表明,在保證灰口鑄鐵的先決條件下,普通離心灰鑄鐵管的組織,盡管可隨基本化學成分和鑄造條件的不同而變化,但其特征是組織粗大且很不均勻,并有明顯的分層現象。加入微量稀土后,無論顯微組織和宏觀組織都顯著趨于細化和均勻化,同時,化學成分的偏析也有明顯改善。Abstract: 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.
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Key words:
- RE grey cast iron /
- centrifugal-casting pipe /
- structure
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