About this Abstract |
Meeting |
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Symposium
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2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
|
Presentation Title |
Hydrogen Embrittlement Relaxation of Stainless Steel via Powder Metallurgy Manufacturing Technology |
Author(s) |
Jihoon Jeong, Seung-Wook Baek, Jung Hyun Kim |
On-Site Speaker (Planned) |
Jihoon Jeong |
Abstract Scope |
Hydrogen is considered a sustainable energy carrier for the future, but it impacts negatively on the mechanical characteristics of metal materials, called hydrogen embrittlement. A new mechanism to ensure hydrogen embrittlement resistance in austenitic stainless steel metal parts is studied for hydrogen service based on powder metallurgy manufacturing technology. An advanced method for ensuring high hydrogen embrittlement resistance is developed by controlling nitrogen content in the gas atomization and powder metallurgy manufacturing processes so that martensite phase transformation is suppressed and a stabilized austenite phase is maintained. Through precise in-situ mechanical testing in a gaseous hydrogen environment, it is observed that the deformation and work hardening are substantially alleviated. Additionally, a nitrogen-controlled SS304L material produced using powder metallurgy-based manufacturing technology exhibits “caramel-like high-strength superplastic deformation” that significantly reduces the necking phenomenon occurring during general metal deformation by avoiding local stress concentration and inducing stress relaxation. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |