About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
The Effect of Additive Manufacturing Process Parameters on the Fatigue Crack Growth Rates of Alloy 718 in Elevated-pressure and Elevated temperature Hydrogen Gas |
Author(s) |
Fassett Hickey, John Macha, Vinicio Ynciarte, Brendy Rincon Troconis |
On-Site Speaker (Planned) |
Fassett Hickey |
Abstract Scope |
The fatigue crack growth rates of wrought alloy 718 in the presence of high pressure hydrogen gas have been studied extensively; however, only limited studies have been performed on additively manufactured (AM) alloy 718 in hydrogen gas environments. AM process parameters and post-processing heat treatment alter the microstructure and metallurgical features, which in turn influence the susceptibility to hydrogen embrittlement. By correlating processing parameters to resultant metallurgical features and mechanical properties, optimal processing parameters, which minimize the potential for hydrogen embrittlement, can be determined. Additionally, studies are underway to investigate the effect of test temperature on the fatigue crack growth rates and failure modes by testing at various temperatures up to 500F. The objectives of this study are to measure the fatigue crack growth rates in gaseous hydrogen and understand the influence of the microstructure and metallurgical features on the hydrogen embrittlement susceptibility of wrought and AM alloy 718. |
Proceedings Inclusion? |
Planned: |