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Metallography, Microstructure, and Analysis

, Volume 7, Issue 6, pp 746–754 | Cite as

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

  • H. M. TawancyEmail author
  • L. M. Alhems
Technical Article

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.

Keywords

Ni–Mo–Cr alloys Corrosion Atomic order Microstructure Deformation behavior 

Notes

Acknowledgements

The authors are grateful for the continued support provided by King Fahd University of Petroleum and Minerals.

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© Springer Science+Business Media, LLC, part of Springer Nature and ASM International 2018

Authors and Affiliations

  1. 1.Center for Engineering Research, Research InstituteKing Fahd University of Petroleum and MineralsDhahranSaudi Arabia

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