| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advancing Current and State-of-the-Art Application of Ni- and Co-based Superalloys
|
| Presentation Title |
G-3: Evaluating the Hydrogen Environment-assisted Cracking Susceptibility of a Next-generation Co-Ni Alloy for Marine Fastener Applications |
| Author(s) |
Zachary D. Harris, Charles Demarest, Brendy C. Rincon Troconis, John R. Scully, James T. Burns |
| On-Site Speaker (Planned) |
Zachary D. Harris |
| Abstract Scope |
Due to the in-service failures of Monel K-500 components from hydrogen environment-assisted cracking (HEAC), there has been significant interest in identifying a replacement alloy for use in marine fastener applications. One candidate system is the Co-Ni alloy MP98T, which exhibits an excellent combination of toughness, strength, and corrosion resistance. However, minimal evaluation of MP98T’s HEAC susceptibility has been performed. In this study, a slow-rising stress intensity (K) testing framework was utilized to measure HEAC kinetics for MP98T immersed in 0.6 M NaCl and polarized to electrochemical potentials ranging from -1000 to -1300 mVSCE, where Monel K-500 is known to be susceptible to HEAC. Results indicate a clear decrease in HEAC susceptibility for MP98T over Monel K-500, with HEAC not observed in MP98T until -1300 mVSCE. The mechanistic underpinnings for this improvement are explored based on an assessment of pertinent mechanical properties, hydrogen-metal interactions, and differences in alloy microstructure. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |