SEM, EDS, EPMA-WDS and EBSD characterization of carbides in HP type heat resistant alloys

The microstructure of centrifugally cast heat resistant alloys of the HP-series (Fe–35Ni–25Cr–0.4C, wt.%) contains several minor phases, like carbides (M 7C 3, M 23C 6 and MC). Several alloys are characterized by means of scanning electron microscopy in back-scattered electron imaging and energy dis...

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Bibliographic Details
Published in:Materials characterization 2008-11, Vol.59 (11), p.1580-1586
Main Authors: Laigo, J., Christien, F., Le Gall, R., Tancret, F., Furtado, J.
Format: Article
Language:English
Subjects:
BACKSCATTERING
CARBON ADDITIONS
Castaing microprobe
CHROMIUM ALLOYS
Cr 23C 6
Cr 7C 3
EDX
ELECTRON DIFFRACTION
ELECTRON MICROPROBE ANALYSIS
HEAT RESISTING ALLOYS
IRON ALLOYS
MATERIALS SCIENCE
MICROSTRUCTURE
NbC
NICKEL ALLOYS
NIOBIUM CARBIDES
SCANNING ELECTRON MICROSCOPY
SPECTROSCOPY
X RADIATION
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Summary:The microstructure of centrifugally cast heat resistant alloys of the HP-series (Fe–35Ni–25Cr–0.4C, wt.%) contains several minor phases, like carbides (M 7C 3, M 23C 6 and MC). Several alloys are characterized by means of scanning electron microscopy in back-scattered electron imaging and energy dispersive spectroscopy, of electron probe micro-analysis by X-ray wavelength dispersive spectroscopy, and of electron back-scattered diffraction. On the one hand, scanning electron microscopy imaging in the back-scattered mode, associated with energy dispersive spectroscopy analysis and electron back-scattered diffraction, can lead to the identification of all phases, but with a lack of accuracy in certain cases. On the other hand, electron probe micro-analysis by X-ray wavelength dispersive spectroscopy alone can always provide a strict identification of all phases, with additional precise information on phase composition, including for light elements, which is important in the case of carbides.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2008.02.001