应用有机电解液低温电解及放射性测量方法,测定了普通铸铁及高纯Fe-C-Si合金中的合金化Ce量及石墨中的Ce量,石墨中的Ce量大都略高于或相近于基体中的Ce量,在Ce含量相同的情况下,铸铁中的合金化Ce量比钢中多。 涂层法自射线照相结果表明:Ce在片状石墨中呈均匀分布,而在球状石墨中的分布却是多样的。开花状石墨中的Ce多于片状石墨及球状石墨中的Ce.球状石墨周围的铁素体及珠光体是贫Ce.远离球状石墨的珠光体及莱氏体是富Ce.初生奥氏体枝晶转变形成的珠光体和蜂窝状莱氏体都含有较少的Ce,而板状渗碳体型莱氏体含Ce较多.Ce明显富集于共晶时最后凝固的区域。球状石墨的形成主要取决于原铁水中的反球化剂(硫)含量,它的影响比球化剂的残留量或合金化量的作用更大。
By means of the low temperature electrolysis with organic electrolyte and the radioassay method, either alloyed Ce in commercial cast iron and in high purity Fe-C-Si alloy or Ce in graphite was measured. The Ce in graphite is slightly higher than in neighboured matrix in most cases. With the same Ce content, more is alloyed in cast iron in comparison with steel. The eoating-autography shows that the Ce distributes uniformly in the flaky graphite, yet variously in the nodular graphite. The "exploded" graphite gets the most Ce among flaky and nodular ones. Ce is depleted from ferrite and pearlite surrounded by nodular graphite, and enriched in pearlite and ledeburite far apart from nodular graphite. Minor Ce is found in pearlite and honeycomb ledeburite which transformed by the dendrite of primary austenite, while major Ce in ledeburite of lathy cementite type. The Ce is remarkably concentrated in the last solidification zone on the eutectic transformation. It could be believed that the formation of nodular graphite mainly depends upon the anti-nodulizer, e. g. S, which is more effective than residual nodulizer or alloying contribution in the raw melted iron.
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