Characterization of carbides at different boundaries of 9Cr-steel
Characterization of carbides at different boundaries of 9Cr-steel
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DOI：
10.1016/j.msea.2003.12.065
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发表时间：
2004-06
期刊：
影响因子：
6.4
通讯作者：
K. Kaneko;S. Matsumura;A. Sadakata;K. Fujita;W. Moon;S. Ozaki;Nishimura Nobuhiko;Y. Tomokiyo
中科院分区：
文献类型：
--
作者：
K. Kaneko;S. Matsumura;A. Sadakata;K. Fujita;W. Moon;S. Ozaki;Nishimura Nobuhiko;Y. Tomokiyo
通过透射电子显微镜进行结构和分析研究相结合，以表征消除应变的 9Cr 钢中两种类型的晶界，即原奥氏体晶界 (PAGB) 和亚晶界的小角晶界（马氏体-板条晶界）处形成的碳化物。选区电子衍射图的结构表征表明，在原奥氏体晶界处存在细小的富 V MC 型碳化物和粗大的 Cr 基 M23C6 型碳化物，而在小角度晶界处则存在细小的 Mo 基 M2C 型碳化物和粗大的 M23C6 型碳化物。通过能量色散 X 射线光谱 (EDS) 进行的分析研究、光谱和绘图分析显示了两个边界碳化物的元素组成和分布。两晶界M23C6型碳化物的成分几乎相同。尽管M23C6型碳化物的形成过程预计彼此不同，但成分相似的根源归因于M23C6型碳化物的稳定相。还提出了这些碳化物在不同边界处的形成机制。
A combination of structural and analytical investigation by transmission electron microscopy was carried out to characterize carbides formed at two types of boundaries in strain-relieved 9Cr-steel, prior-austenite grain boundary (PAGB) and small-angle grain boundary of subgrain boundary (martensite-lath boundary). Structural characterization by selected-area electron diffraction pattern revealed the presence of fine V-rich MC- and coarse Cr-base M23C6-type carbides at prior-austenite grain boundaries, while fine Mo-base M2C- and coarse M23C6-type carbides at small-angle grain boundaries. Analytical investigation, spectral and mapping analysis, by energy dispersive X-ray spectroscopy (EDS) showed the elemental composition and distribution of carbides at both boundaries. The composition of M23C6-type carbides at both boundaries were almost the same. Even though the processes of M23C6-type carbide formation are expected to be different from each other, the origin of similarities in compositions is ascribed to being the stable phase of M23C6-type carbides. The formation mechanisms of these carbides at different boundaries are also proposed.