第1期 冯军等：高碳钢小方坯的一次枝晶臂间距的影响因素 .29. casting.ISIJ Int.1998.38(8):812 北京科技大学学报，1999,21(2)：175 [5]里摩吉斯J,贝特尔曼L.二次冷却和结晶器电磁搅拌对高碳 [8]Imagumbai M.Relation between primary and secondary-dendrite 钢碳偏析及其凝固结构的影响.白静，译。天津冶金，2002， arm spacing of C-Mn steel unidirectionally solidified in steady (4):40 tate.1SInt,1994,34(12):986 [6]张伟强.金属电磁凝固原理与技术，北京：治金工业出版社， [9]Taha M,Jacobi H.Imagumbai M.et al.Dendrite morphology of 2004 several steady state unidirectionally solidified iron base alloys. [7]常国威，薛庆国.电流改变定向凝固单相合金枝晶间距机理 Metall Trans.1982.13A:2131 Influential factors of primary dendritic arm spacing in high-carbon steel billets FENG Jun,CHEN Weiqing Metallurgy and Ecology Engineering School,University of Science and Technology Beijing.100083 Beijing.China ABSTRACI The microstructure during solidification of high-carbon steel billets was investigated.The results showed that primary dendritic arms in the billets were becoming coarser and shorter with evolvement of solidifi- cation.A higher carbon content in the steel was favorable to form short and thick primary dendrites as well as wider primary dendritic arm spacings(PDAS)and coarsening columnar structure.A higher superheat promoted coarse primary dendrites and wider PDAS.With the withdrawal rate slower,it was easy to form narrow PDAS. The greater the secondary cooling water flow ratio,the easier the spindly primary dendrites and narrow PDAS formed.Mole-electromagnetic stirring(M EMS)greatly reduced the PDAS and dendritic length to width ratio. With the increase of M EMS electric current,the PDAS was reduced obviously. KEY WORDS high carbon steel:billets;continues casting:primary dendritic arm spacing:solidification struc- turecasting．ISIJ Int‚1998‚38（8）：812 ［5］ 里摩吉斯 J‚贝特尔曼 L．二次冷却和结晶器电磁搅拌对高碳 钢碳偏析及其凝固结构的影响．白静‚译．天津冶金‚2002‚ （4）：40 ［6］ 张伟强．金属电磁凝固原理与技术．北京：冶金工业出版社‚ 2004 ［7］ 常国威‚薛庆国．电流改变定向凝固单相合金枝晶间距机理． 北京科技大学学报‚1999‚21（2）：175 ［8］ Imagumbai M．Relation between primary and secondary-dendrite arm spacing of C—Mn steel unidirectionally solidified in steady state．ISIJ Int‚1994‚34（12）：986 ［9］ Taha M‚Jacobi H‚Imagumbai M．et al．Dendrite morphology of several steady state unidirectionally solidified iron base alloys． Metall Trans‚1982‚13A：2131 Influential factors of primary dendritic arm spacing in high-carbon steel billets FENG Jun‚CHEN Weiqing Metallurgy and Ecology Engineering School‚University of Science and Technology Beijing‚100083Beijing‚China ABSTRACT The microstructure during solidification of high-carbon steel billets was investigated．The results showed that primary dendritic arms in the billets were becoming coarser and shorter with evolvement of solidifi￾cation．A higher carbon content in the steel was favorable to form short and thick primary dendrites as well as wider primary dendritic arm spacings （PDAS） and coarsening columnar structure．A higher superheat promoted coarse primary dendrites and wider PDAS．With the withdrawal rate slower‚it was easy to form narrow PDAS． The greater the secondary cooling water flow ratio‚the easier the spindly primary dendrites and narrow PDAS formed．Mole-electromagnetic stirring （M—EMS） greatly reduced the PDAS and dendritic length-to-width ratio． With the increase of M—EMS electric current‚the PDAS was reduced obviously． KEY WORDS high carbon steel；billets；continues casting；primary dendritic arm spacing；solidification struc￾ture 第1期 冯 军等：高碳钢小方坯的一次枝晶臂间距的影响因素 ·29·