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

被引：3
作者：
Tawancy H.M. [1 ]
Alhems L.M. [1 ]
机构：
[1] Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, P.O. Box 1639, Dhahran
来源：
Tawancy, H.M. (tawancy@kfupm.edu.sa) | 2018年 / Springer Science and Business Media, LLC卷 / 07期
关键词：
Atomic order; Corrosion; Deformation behavior; Microstructure; Ni–Mo–Cr alloys;
D O I：
10.1007/s13632-018-0486-6
中图分类号：
学科分类号：
摘要：
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. © 2018, Springer Science+Business Media, LLC, part of Springer Nature and ASM International.
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页码：746 / 754
页数：8
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