TY - JOUR
T1 - Characterization of carbides at different boundaries of 9Cr-steel
AU - Kaneko, K.
AU - Matsumura, S.
AU - Sadakata, A.
AU - Fujita, K.
AU - Moon, W. J.
AU - Ozaki, S.
AU - Nishimura, N.
AU - Tomokiyo, Y.
N1 - Funding Information:
This work was partly supported by Special Coordination Funds for Promoting Science and Technology on “Nanohetero Metallic Materials” from the Ministry of Education, Culture, Sports, Science and Technology. A part of this work was supported by “Nanotechnology Support Project” of the Ministry of Education, Culture, Sports and Technology (MEXT), Japan.
PY - 2004/6/15
Y1 - 2004/6/15
N2 - 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.
AB - 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.
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U2 - 10.1016/j.msea.2003.12.065
DO - 10.1016/j.msea.2003.12.065
M3 - Article
AN - SCOPUS:2642583253
SN - 0921-5093
VL - 374
SP - 82
EP - 89
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 1-2
ER -