About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
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| Symposium
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Interstitial–Metal Interactions: The Outsized Role of Small Atoms
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| Presentation Title |
Fracture Mechanics Evaluation of High-Pressure Torsion-Processed DSN9 Steel for Hydrogen–Natural Gas Pipeline Applications |
| Author(s) |
Megumi Kawasaki, Kamel BenNaceur, David Snow, Mari Takahashi, Anil Singh, Indranil Roy, Ting Roy |
| On-Site Speaker (Planned) |
Megumi Kawasaki |
| Abstract Scope |
Hydrogen blending in natural-gas pipelines offers a near-term pathway for hydrogen transport, but pipeline integrity is limited by hydrogen-assisted degradation, fracture susceptibility, and uncertain material compatibility. This study evaluates the residual plasticity and fracture resistance of DSN9 high-nitrogen austenitic stainless steel processed by high-pressure torsion (HPT) relative to X70 pipeline steel under embrittling conditions relevant to blended-gas service. Single-edge-notched bend specimens will be fatigue pre-cracked and tested following ASTM E399 or ASTM E1290, with rising-step-load testing used to determine the fracture toughness (KIscc) in 3.5% NaCl under imposed cathodic potential. Microstructural characterization will be performed by bright-field TEM and HAADF-STEM to relate deformation-induced structure, grain refinement, and defect density to cracking response. HPT-processed DSN9 is expected to combine high strength, corrosion resistance, and improved resistance to hydrogen embrittlement, while comparison with X70 will clarify crack-growth tolerance, crack-arrest behavior, and alloy selection for safer hydrogen and hydrogen-natural-gas pipeline infrastructure. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, High-Temperature Materials, Iron and Steel |