结晶器旋转对电渣重熔钢锭中元素分布的影响  

Effect of Mould Rotation on Distribution of Elements in Steel Ingot in Electroslag Remelting

作　　者：常立忠[1] 施晓芳[1] 从俊强 汪润西 李涛[1] 

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243002

出　　处：《过程工程学报》2014年第2期266-272,共7页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:51104001)

摘　　要：采用自行设计的结晶器可旋转电渣炉,研究了旋转速率对电渣重熔钢锭中元素偏析度的影响.结果表明,当结晶器旋转速率为0～28 r/min时,随其增加,元素的分布更均匀,C偏析度从0.26降至0.0545,Si偏析度从0.26降至0.06,Mn偏析度从0.17降至0.03,Cr偏析度从0.275降至0.066,原因是结晶器运动带动渣池运动,使渣池温度趋于均匀化,同时渣池运动也带动金属液滴在渣池中运动,使小液滴随机滴落于金属熔池中,而不是集中于金属熔池中心部位,因而促进熔池温度均匀分布,有利于形成浅平状熔池;但旋转速率过高对电渣重熔钢锭的凝固质量有害,当旋转速率从28 r/min增至35 r/min时,C偏析度从0.0545增至0.097,Si偏析度从0.06增至0.08,Mn偏析度从0.03增至0.076,Cr偏析度从0.066增至0.16,原因是渣池剧烈运动带动金属熔池运动,流动的液态金属冲洗两相区,将其中树枝晶周围的浓化溶质带走,使该区域溶质含量降低,导致元素偏析.A new electrosalg furnace with mould rotation was designed, and the effects of mould rotation speed on element segregation degree were studied. Experiment results showed that when the rotation speed were 0-28 r/rain, the distribution of elements in steel ingots became more uniform with the increase of the speed. Statistic segregation degree of C decreased from 0.26 to 0.0545, that of Si from 0.26 to 0.06, that of Mn from 0.17 to 0.03, and that of Cr from 0.2753 to 0.066. The improvement in the solidification structure could be attributed to function of reasonable mould speed which could initiate movement in the slag pool and further increase the uniformity of the temperature in the slag pool. At the same time, movement in the slag pool could also affect the metal molten droplets, the liquid drops scattered randomly in the metal pool. However, the excessive rotation speed would deteriorate the solidification structure. When the rotation speed increased to 35 r/rain from 28 r/rain, statistic segregation degree of C increased from 0.0545 to 0.097, that of Si from 0.06 to 0.08, that of Mn from 0.03 to 0.076, and that of Cr from 0.066 to 0.16. The main reason was that the excessive rotation speed made the slag pool violent in motion, so as to drive the molten metal pool rotation which would carry off enriched steel surrounding the dendrites in the mushy zone, reduce the solute content in the region and result in the severe element segregation.

关 键 词：电渣重熔 凝固 偏析 结晶器 旋转 原位分析 

分 类 号：TF741[冶金工程—钢铁冶金]