本文采用电解分离-放射性测量法及显微自射线照相法研究了Ce及S在高纯Fe-C-Si合金各相中的分布和其对石墨形态的影响。实验结果表明:Ce除了与S,O形成夹杂外,首先在石墨中富集;随着合金中Ce含量的增加,石墨中Ce量趋于饱和,大量的Ce以合金化形式存在于铸铁之中;S也在石墨中富集,如合金中S含量继续增加,则以FeS形式存在于共晶团边界;合金中固溶S量极微;石墨形态与Ce在石墨中的吸附和镶嵌程度有关,呈饱和镶嵌吸附时,石墨程球状;呈半饱和态时,石墨为蠕虫状。
Electrolytic extraction-radiometry and microradioautography tech-niques were used to study the distribution of nodulizing element Ce and anti-nodulizing element S in phases of high purity Fe-C-Si alloy. The results show that,besides forming inclusions, most of Ce atoms concentrate in graphite firstly. As theCe content increase, the concentration of Ce in graphite tends to saturate, relati-vely large amount of Ce dissolves in the alloy. Usually, the sulphur also concen-trates in graphite, however, it may exist in the form of FeS at the eutectic colonyboundaries, if the concentration of S is at a quite high level. Very little amountof S dissolves in the alloy. The morphology of graphite depends upon the degreeof saturation of Ce. It appears as nodula when Ce was saturated, and as vermicularwhile it was semi-saturated.
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