About this Abstract |
Meeting |
TMS Specialty Congress 2025
|
Symposium
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The 7th International Congress on 3D Materials Science (3DMS 2025)
|
Presentation Title |
Investigating the Influence of Strain Rate on Hydrogen Embrittlement in Steel Sub-size Tensile Specimens Using 3D X-Ray Tomography |
Author(s) |
Luciano Meirelles Santana, Victor Okumko, Andrew King, Thilo Morgeneyer, Jacques Besson, Yazid Madi |
On-Site Speaker (Planned) |
Luciano Meirelles Santana |
Abstract Scope |
This study investigates the effect of strain rate on hydrogen embrittlement in ferritic-pearlitic E355 steel using sub-size tensile specimens and micrometer-scale 3D X-ray tomography. Tests were conducted in air and 100 bar hydrogen at varying strain rates, with some interrupted before rupture to capture damage evolution. Hydrogen reduces ductility, with losses reaching up to 62.8% at lower strain rates.
3D X-ray tomography enabled the quantification of damage and the determination of its shape and orientation at different strain rates. At 5 × 10⁻⁴ s⁻¹, brittle surface cracks appear as flat ellipsoids perpendicular to the tensile axis, while ductile bulk damage consists of prolate voids aligned along it. Hydrogen-enhanced shearing promotes coalescence through slant fracture. At 1 × 10⁻⁵ s⁻¹, deeper hydrogen diffusion increases embrittlement, causing both surface and bulk damage to adopt a brittle, flat ellipsoidal morphology perpendicular to the tensile axis. |
Proceedings Inclusion? |
Undecided |