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Metallography, Microstructure, and Analysis
Erschienen in: Metallography, Microstructure, and Analysis 1/2012

01.02.2012 | Technical Article

Role of Rhenium on Solidification, Microstructure, and Mechanical Properties of Standard Alloy 718

verfasst von: Nader El-Bagoury, Adel A. Omar, K. Ogi

Erschienen in: Metallography, Microstructure, and Analysis | Ausgabe 1/2012

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Abstract

The effect of Rhenium (Re) additions to Standard Alloy 718 on solidification, microstructure, and mechanical properties represented by hardness was studied. Re has a very high strain hardening rate, which is about 3.5 times than that of W or Mo. Re retards γ″ and γ′ coarsening, and also forms clusters within the γ matrix. In addition, Re does not from carbides. However, the microstructure of Re-containing Alloy 718 has a higher volume fraction of δ phase than the standard alloy. Electron microprobe analysis and transmission electron microscopy observations were used to identify the precipitation of hard γ″ and γ′ phases as well as δ phase. Re elevates phase transformation temperatures of γ matrix, eutectic γ/NbC, and eutectic γ/Ni2Nb. The volume fractions of γ dendrites, NbC and Ni2Nb phases, are increased with Re content in Alloy 718. Enhancement of hardness was also evident in the vicinity of a Re-cluster.
Vorheriger Artikel Application of Chords for Quantitative Characterization of Multi-Constituent Microstructures
Nächster Artikel Contributions of Light Microscopy to Contemporary Materials Characterization: The New Directional Solidification

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Metadaten
Titel
Role of Rhenium on Solidification, Microstructure, and Mechanical Properties of Standard Alloy 718
verfasst von
Nader El-Bagoury
Adel A. Omar
K. Ogi
Publikationsdatum
01.02.2012
Verlag
Springer-Verlag
Erschienen in
Metallography, Microstructure, and Analysis / Ausgabe 1/2012
Print ISSN: 2192-9262
Elektronische ISSN: 2192-9270
DOI
https://doi.org/10.1007/s13632-012-0011-2

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