LCAK钢连铸头坯亚表层hook结构特征  

Structure characteristic of subsurface hooks in continuous cast LCAK steel head slabs

作　　者：杨文[1] 许志刚[1] 薛勇强[2] 曹晶[1] 王新华[1] 王万军[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]首钢京唐钢铁联合有限责任公司制造部,唐山063200

出　　处：《北京科技大学学报》2011年第11期1341-1348,共8页Journal of University of Science and Technology Beijing

基　　金："十一五"国家科技支撑计划资助项目(2006BAE03A13)

摘　　要：对LCAK钢头坯亚表层hook结构的特征进行了研究.结果显示:hook各特征之间存在着显著的相关性,比如随着hook倾角的增加,hook的长度、深度和厚度等也都呈现增大趋势;随着振痕深度增加、拉速减小,hook各特征也都呈现出增加的趋势;hook的长度、深度和厚度等随着浇铸长度的增加而减小,在浇铸7.9 m后hook各特征基本不变,这与结晶器热流呈现出相反的关系,热流越大,hook越短.最后提出了一种hook的形成机理,认为弯月面凝固发生于正滑脱后期和负滑脱前期两个阶段,此机理能够解释实验中观察到的hook起始点偏离振痕波谷的现象,并对hook的影响因素进行了讨论.The characteristics of subsurface hooks in continuous cast LCAK steel head slabs were investigated.The results show that the hook characteristics have significant correlations with each other,e.g.the mean hook length,thickness and depth increase with the rise of hook angle.The hook characteristics increase when the oscillation mark depth increases and the casting speed decreases.With the increase of casting length,the mean hook length,depth and thickness decrease,and when the casting length exceeds 7.9 m the hook characteristics remain stable.However the mold heat extraction has a reverse trend,thus with the increase of heat extraction the hooks become shorter.Finally a hook formation mechanism was proposed.It is suggested that meniscus freezing occurred during two stages,the late stage of the positive strip period and the earlier stage of the negative strip period.The mechanism could explain the phenomena that the hook root deviates from the valley of the oscillation mark,and then the main factors affecting hook characteristics were discussed.

关 键 词：连铸 铸坯 本征缺陷 结构特征 形成机理 

分 类 号：TF777[冶金工程—钢铁冶金]