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Comparison of the Phase Stability and Corrosion Resistance of the Ni-Based Alloys C-4 and C-276

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

Abstract

A one-to-one correspondence is developed between the phase stability and corrosion resistance of the commercial (Ni-Cr-Mo)-based alloys C-276 and C-4. Alloy C-4 is shown to outperform alloy C-276 in acidic oxidizing media and approaches its resistance in acidic reducing media. Both alloys are found to have similar resistance to chloride-induced stress corrosion cracking in the annealed condition with short-range order. The aqueous corrosion resistance of both alloys is found to be improved by long-range order; however, they become highly susceptible to chloride-induced stress corrosion cracking. Alloy C-4 is distinguished by being stable toward precipitation of detrimental intermetallic compounds. However, alloy C-276 is shown to be prone to precipitation of mu phase which degrades its resistance to aqueous corrosion and chloride-induced stress corrosion cracking. It is concluded that the chemical composition of alloy C-4 is tailored to make it more versatile than alloy C-276 in acidic oxidizing media and the results are found to be consistent with the concept of atomic percent factor of each alloy.

Keywords

aqueous corrosion electron microscopy microstructure Ni-based alloys stress corrosion cracking 

Notes

Acknowledgments

It is a pleasure to acknowledge the continued support of King Fahd University of Petroleum and Minerals.

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Copyright information

© ASM International 2019

Authors and Affiliations

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

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