机械搅拌对中碳钢钢液凝固组织的影响  

Effect of mechanical stirring on the solidification structure of medium-carbon steel

作　　者：宋佳慧[1] 苍大强[1] 孔为[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《钢铁研究》2011年第5期4-7,共4页Research on Iron and Steel

基　　金：国家自然科学基金重点项目(51034008);十二五国家科技支撑计划重大项目(2011BAC06B10)

摘　　要：研究了中碳钢钢液在凝固初期施加机械搅拌,改变搅拌参数对钢液凝固组织的影响。实验结果表明,随着搅拌时间的延长等轴晶比例增大,搅拌时间30 s时,等轴晶比例最大为50.784%;改变插入钢液深度,随着插入液面深度的增加,等轴晶区比例明显增大,同时晶粒得到细化,分布更均匀,插入深度为4.5 cm时,等轴晶比例和晶粒细化程度达到最优为30.866%;改变不同的搅拌速度时发现,搅拌速度越慢,等轴晶比例越大,搅拌速度为540 r/min时,试样凝固组织最好,等轴晶比例为50.784%。实验得到最优组合为搅拌时间30 s,插入深度4.5 cm,搅拌速度540 r/min,最优组合下得到的凝固组织等轴晶比例提高到62.618%。The effect of various stirring parameters on the solidification structure of medium-carbon steel during the initial stage of solidification was studied in this paper.The results showed that with different stirring processing time,the macrostructure was refined and equiaxed crystal also increased,as well as columnar crystal reduced and the proportion of equiaxed grains enhanced with the increasing stirring time;by changing the depth inserted into liquid steel,it can be seen that the proportion of equiaxed crystal zone significantly increased,grain size was refined and distributed more evenly with the increase of insertion depth;By changing stirring rate,it was inferred that the slower the stirring rate,the larger the proportion of equiaxed grains.The mechanism of these phenomena were also analyzed.

关 键 词：机械搅拌 中碳钢 凝固组织 等轴晶率 

分 类 号：TF761.3[冶金工程—钢铁冶金]