连铸坯组织影响混晶产生的研究  

Effect of Microstructure of Continuously Casting Slab on Formation of Mixed Grain in Rolled Product

作　　者：何建中[1] 刘雅政[1] 史秉华[1] 刘清友[2] 王雪莲[3] 李德刚[3] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]钢铁研究总院结构材料研究所,北京10008 [3]包头钢铁(集团)有限责任公司薄板坯连铸连轧厂,内蒙古包头014010

出　　处：《钢铁》2005年第2期69-71,共3页Iron and Steel

摘　　要：针对轧制 Nb微合金化 Q 345 C板材时部分产品组织中出现的带状混晶现象 ,利用扫描、透射电镜以及能谱分析观察了铌的质量分数为 0 .0 5 2 %的 Q345 C钢连铸坯的微观组织。结果表明 ,不同部位连铸坯组织晶粒尺寸存在显著差异 ,从表面的约 30～ 5 0μm增大到中部的 15 0～ 2 0 0μm,这是导致成品组织中出现混晶带状现象的重要原因。Themixed grain zone is observed in Nb microalloyed Q345C plate produced by CSP process.The microstructure of the c ontinuous by cast slab of Q345C steel with 0.052%Nb was studied with scanning e lectron microscopy, transmission electron microscopy and energy spectrum analysi s.The transmissibility of microstructure and its effect on the rolled product m icrostructure was analyzed.As a result, great difference in the grain size of c ast slab, which increases from 30~50 μm in the surface to 150~200 μm in the he art is the important reason of formation of mixed grain zone in the rolled produ ct.

关 键 词：Nb微合金化Q345C钢 连铸坯 微观组织 析出 

分 类 号：TG333.71[金属学及工艺—金属压力加工]