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| MICRODISTRIBUTION OF NODULIZER IN VARIOUS PHASES OF CAST IRON |
| ZHONG Weizhen; HAN Qiyong; HUO Chengzhang; LIU Xiukun; JIANG Yuxian; LI Xiaoguang; ZHANG Zirong (Beijing University of Iron and Steel Technology) |
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Cite this article:
ZHONG Weizhen; HAN Qiyong; HUO Chengzhang; LIU Xiukun; JIANG Yuxian; LI Xiaoguang; ZHANG Zirong (Beijing University of Iron and Steel Technology). MICRODISTRIBUTION OF NODULIZER IN VARIOUS PHASES OF CAST IRON. Acta Metall Sin, 1986, 22(5): 97-105.
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Abstract 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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Received: 18 May 1986
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1 韩其勇;吴卫江;方克明;卢静;张保军;谢德义;裴丽侠,金属学报,15(1979) ,1．
2 Han Qiyong; Wu Weijing; Fang Keming; Huo Chengzhang; Zhou Xiaolong Proc. of Sino-Japanese Symposium on Iron and Steel, First Symp. on Steelmaking, Beijing, 1981, p. 25; 钢铁,(1982) , №2, 1．
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5 杜维玺;蒋青;韩其勇;钟伟珍等,稀土在灰铸铁中的合金化量及其分布,待发表.
6 Lux, B., Cast Met. Res. J., 8(1972) , №2, 49 |
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