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Metallography, Microstructure, and Analysis
Published 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

Authors: H. M. Tawancy, L. M. Alhems

Published in: Metallography, Microstructure, and Analysis | Issue 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.
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Metadata
Title
Correlation Between the State of Atomic Order in Selected (Ni–Mo–Cr)-Based Alloys and Their Corrosion Resistance
Authors
H. M. Tawancy
L. M. Alhems
Publication date
19-09-2018
Publisher
Springer US
Published in
Metallography, Microstructure, and Analysis / Issue 6/2018
Print ISSN: 2192-9262
Electronic ISSN: 2192-9270
DOI
https://doi.org/10.1007/s13632-018-0486-6

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