Article Dans Une Revue International Journal of Hydrogen Energy Année : 2025

Investigating the influence of strain rate on hydrogen embrittlement in steel sub-size tensile specimens using 3D X-ray tomography

Résumé

This study investigates the effect of strain rate on hydrogen embrittlement in ferritic-pearlitic E355 steel subsize tensile specimens. Micrometer-scale damage analysis was performed using 3D X-ray tomography. Tests were conducted using an optical extensometry at varying strain rates in air and a 100 bar gas hydrogen atmosphere, including interrupted tests before rupture to capture damage states. Hydrogen reduces ductility, with losses reaching up to 62.8% at slower strain rates. At moderate strain rate, 5 × 10-4 s-1, surface damage manifests as brittle, flat ellipsoidal cracks perpendicular to the tensile axis, while the bulk retains ductile damage with prolate voids aligned longitudinally. Hydrogen-enhanced internal shearing leads to damage coalescence via slant fracture of the ligament between surface cracks and internal voids. At low strain rates (1 × 10-5 s-1), deeper hydrogen diffusion induces brittle flat ellipsoidal cracks both at the surface and in the bulk.

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Dates et versions

hal-05083638 , version 1 (25-05-2025)

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L.M. Santana, Victor Okumko, Andrew King, T.F. Morgeneyer, J. Besson, et al.. Investigating the influence of strain rate on hydrogen embrittlement in steel sub-size tensile specimens using 3D X-ray tomography. International Journal of Hydrogen Energy, 2025, 138, pp.626-647. ⟨10.1016/j.ijhydene.2025.04.398⟩. ⟨hal-05083638⟩
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