About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Materials and Systems for a Hydrogen Economy
|
| Presentation Title |
Hydrogen embrittlement of a high-strength Ni-based superalloy with varying Ti/Al ratio and Ta content |
| Author(s) |
Martin Detrois, Yuan Tian, Chris San Marchi, Stoichko Antonov, Paul Jablonski |
| On-Site Speaker (Planned) |
Martin Detrois |
| Abstract Scope |
The resistance of a novel high-strength Ni-based superalloy (based on IN725) to hydrogen embrittlement was investigated using room temperature tension testing after gaseous charging in pure hydrogen. The composition of the alloy was varied using different Ti/Al ratios and low/high Ta concentration to promote the formation of various phases. Thus, different bulk precipitate strengthening phases were formed, but most importantly, various grain boundary phase precipitates. It was found that the grain boundary precipitates were strong contributors to the embrittlement of the material and intergranular fracture was most common. An alternate aging heat treatment was investigated to try and minimize the effect of the grain boundary phases while maintaining the high strength. The results are supported by characterization using scanning electron microscopy, electron dispersive spectroscopy and thermal desorption mass spectrometry. The findings offer insights and design pathways for the development of high-strength Ni-based superalloys capable to operate in hydrogen environments. |