Influential factors of primary dendritic arm spacing in high-carbon steel billets
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摘要: 高碳鋼小方坯顯微凝固組織的研究表明:一次枝晶臂在凝固過程中不斷粗化變短;碳含量高,容易形成長寬比小的一次枝晶,并且一次枝晶臂間距增寬,容易形成粗大的柱狀晶組織;過熱度高,易形成粗大的一次枝晶,一次枝晶臂間距增寬;拉速慢,容易形成細長的一次枝晶,一次枝晶臂間距減少;二次冷卻水流量比增加,易形成細長的一次枝晶,一次枝晶臂間距降低.結晶器電磁攪拌可顯著降低一次枝晶臂長寬比,并減小一次枝晶臂間距;攪拌電流增加,則一次枝晶臂間距減小效果更明顯.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 solidification. 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.
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