GRAIN BOUNDARY NIOBIUM CARBIDES IN INCONEL 718

Two types of grain boundary carbides that are believed to be responsible for oxygen assisted crack growth in Inconel 718 have been identified: primary NbC and secondary Nb-rich carbides. The secondary Nb-rich carbides serve as a more attractive, additional source of embrittling Nb and ensure its rea...

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Veröffentlicht in:	Scripta Materialia 1997-12, Vol.37 (12), p.1843-1849
Hauptverfasser:	Gao, Ming, Wei, Robert P.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences CRACK PROPAGATION Cross-disciplinary physics: materials science rheology EMBRITTLEMENT Exact sciences and technology GRAIN BOUNDARIES INCONEL 718 MATERIALS SCIENCE Metals. Metallurgy MICROSTRUCTURE Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Physics Precipitation Solid-phase precipitation
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Zusammenfassung:	Two types of grain boundary carbides that are believed to be responsible for oxygen assisted crack growth in Inconel 718 have been identified: primary NbC and secondary Nb-rich carbides. The secondary Nb-rich carbides serve as a more attractive, additional source of embrittling Nb and ensure its ready diffusion over the grain boundaries. The possible contribution of gamma ' and the applicability of the proposed embrittlement mechanism to other nickel-base alloys are being examined and will be reported.
ISSN:	1359-6462 1872-8456
DOI:	10.1016/S1359-6462(97)00373-4