About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
Designing Interlath Austenite as Hydrogen Traps in PH17-4 Stainless Steel |
| Author(s) |
Parth Khandelwal, Michela Geri, Hyunsoek Oh, Cemal Cem Tasan |
| On-Site Speaker (Planned) |
Parth Khandelwal |
| Abstract Scope |
Hydrogen is known of its notoriousness for its detrimental interactions with metals, severely degrading their mechanical properties. This study presents a novel, cost-effective design utilizing austenite nanophase as hydrogen traps in ph17-4 martensitic stainless steel (SS). The higher solubility and lower diffusivity of austenite by orders of magnitude compared to martensite, makes it equipped to act as hydrogen traps. Moreover, interestingly, austenite is not always soft; it exhibits high hardness in the nano-size regime. To harness these austenite characteristics simultaneously, stable nano-sized interlath reverted austenite is introduced in the martensitic SS by inter-critical annealing at 640C for 10mins. The stability, size distribution and phase fraction of austenite against the deformation and hydrogen charging are demonstrated using X-ray Diffraction (XRD), Small-Angle X-ray Scattering (SAXS), and synchrotron measurements. Additionally, the hydrogen trapping in the austenite phase has been confirmed through in-situ Kelvin Probe Force Microscopy (KPFM). |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Characterization, Iron and Steel |