CSP流程薄板坯原位统计分布技术分析  

Original Position Statistic Distribution Analysis for Thin Slab Produced by CSP

作　　者：黎先浩[1] 康永林[1] 吴光亮[2] 肖爱达[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]湖南华菱涟源钢铁有限公司,湖南娄底417009

出　　处：《钢铁研究学报》2009年第8期9-12,34,共5页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(50334010)

摘　　要：以冷轧冲压用钢薄板坯为研究对象，观察了低倍组织，用原位分析仪研究了铸坯的宏观偏析、致密度和夹杂物．用扫描电镜分析了夹杂物的形貌和成分。结果表明，铸坯心部有2～3个蚀孔，细密树枝晶占74％，柱状晶凝固末端向上倾斜10～20°。碳、硫、铝元素最大偏析度大于3，偏析位置并非分析面的中心对称点。碳、硫元素在厚度中心处有较严重的岛状偏析，铝为多点状偏析，硫、铝元素偏析重合处为CaS-MnS-Al2O3复合夹杂物，其余元素偏析不明显。横截面板厚中心疏松存在硫和铝的富集。Macrostructure, macrosegregation, density and inclusion of thin slab for cold-rolled steel have been in- vestigated by acid etching and OPA （original position statistic distribution analysis）. The micrographs and compo- sition of inclusions have been analyzed by SEM （scanning electron microscope） with EDS （energy dispersive X-ray spectrometer） system. It was found that 2--3 corrosion pits were found in the center of thin slab （equiaxial crystal zone） and fine dendrite made up 74% volume, terminal of column dendrite tilted up at an angle of 10--20° due to upflow of liquid phase. Maximum segregation degree of C, S, Al was more than 3 and location of segregation was not in the center of the analyzed surface. Serious island-like segregation of C, S was detected in the middle of thickness and numerous scattered spotty segregation of AI was also found. The segregation of S and AI was ob- served in the same area; moreover, it was considered as complex inclusions of CaS-MnS-Al2O3 No obvious segre- gation except for C, S, AI was found. Enrichment of S and Al was detected at porosities of central thickness.

关 键 词：薄板坯 宏观偏析 夹杂物 

分 类 号：TF777[冶金工程—钢铁冶金]