About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Additively Manufactured Materials
|
| Presentation Title |
Hydrogen Embrittlement of Laser Powder Bed Fusion Ni-Based Superalloys |
| Author(s) |
Michael P. Moodispaw, Chris San Marchi, Chantal Sudbrack |
| On-Site Speaker (Planned) |
Michael P. Moodispaw |
| Abstract Scope |
Efforts to improve efficiency of industrial gas turbine engines have focused on increasing operating temperatures by use of hydrogen and hydrogen-natural gas blend fuels. Ni-based superalloys are susceptible to hydrogen embrittlement (HE), leading to potential risk of premature component failure. Certain turbine components exposed to hydrogen-rich environments are manufactured from additive processes like laser powder bed fusion (L-PBF). The HE susceptibility was evaluated for three Ni-based superalloys: solid solution strengthened Alloy 625, γ’/γ’’-precipitation strengthened Alloy 718, and γ’-precipitation strengthened Haynes® 282®. L-PBF samples were pre-charged under medium and high pressure gaseous hydrogen before tensile testing at temperatures up to 260 °C using a slow and fast strain rate. Selected samples were subjected to a service conditioning heat treatment prior to hydrogen charging to evaluate the change in susceptibility after prolonged service. The susceptibility to HE and HE mechanisms of these three alloys is compared using microstructure and fracture surface analyses. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Copper / Nickel / Cobalt, Environmental Effects |