试验用钢是基于增加石墨核心可以有效促进材料的石墨化过程来进行成分设计和试样制备的.利用光学显微镜,对试样内部石墨化过程进行了间接观察,利用高温显微镜,对试验用钢试样表面石墨化过程进行了原位的直接观察;以及利用场发射扫描电镜对石墨粒子结构进行了精细观察.结果表明,正是钢中具有与石墨结构(简单六方)相同的BN成为了石墨的非均质形核核心,才有效促进了钢的石墨化过程,实现了中碳钢的石墨化.
The composition design and specimen preparation tested steel carried out based on the fact that the graphitization process can be accelerated by increasing graphite nucleus.The graphitization process of sample surface was observed in situ by high-temperature microscope.The graphitization process inside the sample was observed indirectly by optical microscope.The microstructure of graphite was observed by FE SEM.The experimental results indicate that BN is the heterogeneous nuclei of graphite stimulate formation of graphite,which in tested sample,and the graphitization of medium carbon is realized.
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