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Metallography, Microstructure, and Analysis
Erschienen in: Metallography, Microstructure, and Analysis 6/2018

19.09.2018 | Technical Article

Correlation Between the State of Atomic Order in Selected (Ni–Mo–Cr)-Based Alloys and Their Corrosion Resistance

verfasst von: H. M. Tawancy, L. M. Alhems

Erschienen in: Metallography, Microstructure, and Analysis | Ausgabe 6/2018

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Abstract

A study has been conducted to determine the effect of the state of atomic order in Hastelloy alloys C-276, C-4, and C-22 on their corrosion properties. It is shown that alloy C-22 outperforms alloys C-276 and C-44 in terms of resistance to aqueous oxidizing and reducing media in the annealed condition with face-centered cubic structure containing short-range order. This behavior could be related to the optimized combination of Cr and Mo in alloy C-22 with the smaller addition of W. However, the three alloys are found to be resistant to stress-corrosion cracking despite the combination of short-range order and relatively low stacking fault energy. Long-range ordering to a Pt2Mo-type superlattice with body-centered tetragonal structure is found to enhance the resistance to aqueous corrosion with alloy C-22 still outperforming alloys C-276 and C-4. However, the three alloys become highly susceptible to stress-corrosion cracking. The results are correlated with the ordered microstructure and its effect on the deformation behavior.
Vorheriger Artikel Influence of Temperature Variation on Tribological Behavior of Aluminum Matrix Hybrid Composites: A Statistical Analysis
Nächster Artikel Structure and Atomic Profile of Grain Boundary Triple Junctions in Tungsten

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Metadaten
Titel
Correlation Between the State of Atomic Order in Selected (Ni–Mo–Cr)-Based Alloys and Their Corrosion Resistance
verfasst von
H. M. Tawancy
L. M. Alhems
Publikationsdatum
19.09.2018
Verlag
Springer US
Erschienen in
Metallography, Microstructure, and Analysis / Ausgabe 6/2018
Print ISSN: 2192-9262
Elektronische ISSN: 2192-9270
DOI
https://doi.org/10.1007/s13632-018-0486-6

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