利用聚焦离子束技术构建铁素体三维形态  

Construction of three-dimensional morphology of ferrite by focused ion beam technique

作　　者：武绍文 张彩军 吴哲 WU Shao-wen;ZHANG Cai-jun;WU Zhe(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063009,Hebei, China;Hebei Province High Quality Steel Continuous Casting Engineering Technology Research Center,Tangshan 063009,Hebei,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063009 [2]河北省高品质钢连铸工程技术研究中心,河北唐山063009

出　　处：《钢铁》2019年第1期85-91,共7页Iron and Steel

基　　金：国家自然科学基金资助项目(51474089)

摘　　要：钢铁行业对铁素体的三维表征、组织演变、物理性能等越来越重视,现如今随着新型设备的引入,带动了研究方法的进步。通过聚焦离子束技术(FIB),构建了EH40级船板钢晶内铁素体、晶界铁素体的三维形态。结果表明,根据试验所得的晶内铁素体的三维形态,可知晶内铁素体是与其他铁素体发生碰撞而形成,并且有亚晶粒的存在。根据试验所得的晶界铁素体,其形态如针状,表面并不平滑,且由于碰撞,在其表面存在凹坑,并且建立了数学模型,展示出其三维形态可能是晶界表面处碳元素的快速扩散所导致的。The steel industry and even the material science major pay more and more attention to the three-dimensional characterization,organizational evolution and physical properties of ferrite. With the introduction of new equipment,the research methods have been promoted. The three-dimensional morphology of intragranular ferrite and grain boundary ferrite in EH40 grade ship steel was constructed by focused ion beam technique(FIB),and the three-dimensional shape of intragranular ferrite and grain boundary ferrite in EH40 grade ship steel was constructed. The results showed that the three-dimensional morphology of intragranular ferrite obtained by the experiment was found to be formed by collision with other ferrites,and subgrain regulations existed. The grain boundary ferrite shaped like a needle with surface which was not smooth. And due to the collision,there were pits on the surface. A mathematical model was established which shown that its three-dimensional morphology may be caused by the rapid diffusion of C elements at the grain boundary surface.

关 键 词：聚焦离子束 三维形貌 晶内铁素体 晶界铁素体 

分 类 号：TG142.1[一般工业技术—材料科学与工程]