Aminorroaya Sima, Dippenaar Rian
Faculty of Engineering, University of Wollongong, Northfield Ave., Wollongong, NSW 2522, Australia.
J Microsc. 2007 Aug;227(Pt 2):92-7. doi: 10.1111/j.1365-2818.2007.01793.x.
A concentric solidification technique has been employed to simulate sulphide precipitation at the centreline of a continuously cast low-carbon, low-manganese, titanium-added steel slab. Selected precipitates were identified using transmission electron microscopy following sample preparation by focused ion beam milling techniques. FeTiS(2) and hexagonal MnS containing iron atoms form in close proximity to each other in super-saturated areas of the concentrically solidified sample. The presence of FeTiS(2) precipitates in low-carbon steel has been verified for the first time, and the crystal structure determined by electron diffraction analysis as a trigonal CdI(2)-type with a P3 m1 space group and lattice parameters of a= 0.341 nm and c= 0.569 nm.
采用同心凝固技术模拟了连铸低碳、低锰、加钛钢板坯中心线处的硫化物析出过程。在通过聚焦离子束铣削技术制备样品后，利用透射电子显微镜鉴定了选定的析出物。在同心凝固样品的过饱和区域中，FeTiS₂和含铁原子的六方MnS彼此紧邻形成。首次证实了低碳钢中存在FeTiS₂析出物，并通过电子衍射分析确定其晶体结构为具有P3 m1空间群、晶格参数a = 0.341 nm和c = 0.569 nm的三方CdI₂型。
