Relationship between Crystal Structure of Inclusions and Formation of Acicular Ferrites  

作　　者：Zhi-min CUI Li-guang ZHU Yuan-liang LI Qing-jun ZHANG Chun-liang YAN Wen-ling MO 

机构地区：[1]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing [2]Analysis and Testing Center,North China University of Science and Technology [3]College of Metallurgy and Energy,North China University of Science and Technology [4]Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials,North China University of Science and Technology [5]Yi Sheng College,North China University of Science and Technology

出　　处：《Journal of Iron and Steel Research International》2016年第6期586-592,共7页

基　　金：Item Sponsored by National Natural Science Foundation of China(51574106,51474089);Key Funds of Natural Science Foundation of Hebei Province of China(E2016209396);Natural Science Foundation of Hebei Province of China(E2013209207);Research Science Institute on High-level Personnel of Colleges in Hebei Province of China(GCC20142030)

摘　　要：The formation mechanism of intragranular ferrites with acicular morphology was discussed.The ferrites were characterized by scanning electron microscopy.The results showed that the ferrites had an acicular structure with radial,symmetrical,and acicular laths,and that the inclusions were the nucleation sites of the intragranular acicular ferrites.Transmission electron microscopy（TEM）was used to characterize the inclusions.The results of TEM with energy dispersive spectroscopy and TEM-selected area electron diffraction indicated that the complex inclusions consisted of Ti-Al complex oxides and MnS.The jagged edges of the complex inclusions can be ascribed to the effects of the crystal structure.The stabilization energy U of the coordination polyhedron growth units varies with the type of connection according to the calculation results.A larger Ucorresponds to more stable growth units,which induces the preferentially oriented growth of inclusions,at which point acicular ferrites are formed.The formation mechanism of intragranular ferrites with acicular morphology was discussed.The ferrites were characterized by scanning electron microscopy.The results showed that the ferrites had an acicular structure with radial,symmetrical,and acicular laths,and that the inclusions were the nucleation sites of the intragranular acicular ferrites.Transmission electron microscopy（TEM）was used to characterize the inclusions.The results of TEM with energy dispersive spectroscopy and TEM-selected area electron diffraction indicated that the complex inclusions consisted of Ti-Al complex oxides and MnS.The jagged edges of the complex inclusions can be ascribed to the effects of the crystal structure.The stabilization energy U of the coordination polyhedron growth units varies with the type of connection according to the calculation results.A larger Ucorresponds to more stable growth units,which induces the preferentially oriented growth of inclusions,at which point acicular ferrites are formed.

关 键 词：nucleation dispersive preferentially stabilization characterize rutile ferrite anatase grains symmetrical 

分 类 号：TG142.11[一般工业技术—材料科学与工程]