低碳钢退火板中粗大晶粒成因的EBSD分析  

Formation of the coarse grains in annealed low carbon steel sheets by EBSD analysis

作　　者：李萧[1] 杨平[1] 林瑞民[2] 刘西峰[2] 陈冷[1] 

机构地区：[1]北京科技大学材料学院,北京100083 [2]唐山建龙实业有限公司,河北遵化064200

出　　处：《电子显微学报》2009年第1期34-38,共5页Journal of Chinese Electron Microscopy Society

基　　金：北京科技大学新金属材料国家重点实验室资助项目(2007AMM006)

摘　　要：以SPCD低碳钢罩式炉退火板为例,利用电子背散射衍射(EBSD)技术,针对晶粒尺寸不均匀样品中粗大晶粒的产生原因进行了分析。测量结果表明,大部分粗大晶粒为〈111〉∥ND即{111}取向的晶粒;少数为〈112〉∥ND即{112}取向的晶粒。其成因可能有两点:(1)热轧薄板表层中形成的粗大铁素体组织将会遗传到随后经冷轧-退火的钢板中,引起个别晶粒异常粗大;(2)AlN粒子钉扎作用的不均匀使具有生长优势的{111}和{112}晶粒长大,最终形成粗大的晶粒。Taking batch-annealed low carbon steel sheets as example, this paper analyzed the cause for the coarse grains occurred in the sample with non-uniform grain size distribution by means of electron backscatter diffraction （EBSD） technique. Measurements showed that most coarse grains had the orientation with 〈111〉ND, whereas minority of those had the orientation with 〈112〉ND. The formation of coarse grains are attributed to two reasons： （1） The coarse ferrite structure formed on the surface layer of hot rolling sheets could inherit subsequent cold rolling-annealing sheets, and induced unusual grain coarsening; （2） Inhomogeneous distribution of pinning AlN particles promoted the preferred growth of {111} and {112} grains into coarse ones.

关 键 词：低碳钢 粗大晶粒 EBSD 

分 类 号：TG142.31[一般工业技术—材料科学与工程] TG115.215.3[金属学及工艺—金属材料]