| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Elucidating the Loading Rate Dependence of Hydrogen Environment-assisted Cracking Behavior in a Ni-Cu Superalloy |
| Author(s) |
Zachary D. Harris, Erin M. Dubas, Allison S. Popernack, Brian P. Somerday, James T. Burns |
| On-Site Speaker (Planned) |
Zachary D. Harris |
| Abstract Scope |
Though literature indicates that the applied loading rate (dK/dt) can affect hydrogen environment-assisted cracking (HEAC) behavior, quantification of dK/dt dependencies, as well as mechanistic understanding of how dK/dt influences HEAC, remains limited. In this study, a slow-rising stress intensity (K) testing framework was utilized to measure HEAC kinetics in Monel K-500 immersed in 0.6 M NaCl and polarized to -950 mVSCE at dK/dt ranging from 0.2 to 20 MPa√m/hr. Results confirm a strong influence of dK/dt on HEAC, with crack growth rates (da/dt) exhibiting two characteristic regimes of behavior depending on applied dK/dt. In particular, a ‘plateau’ regime where da/dt is independent of dK/dt was observed for dK/dt > 2 MPa√m/hr, while a ‘linear’ regime where da/dt linearly scales with dK/dt was observed for dK/dt < 2 MPa√m/hr. The implications of these results on recent testing standardization efforts for environment-assisted cracking are then discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |