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5. Glossary
Fragilisation par l'hydrogène (FPH) ; Hydrogen embrittlement
Degradation of the mechanical properties of metal alloys in the presence of hydrogen, generally resulting in a drop in ductility and toughness and an acceleration in the rate of fatigue crack propagation.
Hydrogen Induced Decohesion (HID) or Hydrogen Enhanced Decohesion Embrittlement (HEDE)
Embrittlement mechanism associated with a drop in the cohesive energy of crystal planes or interfaces in the presence of hydrogen.
Hydrogen Enhanced Localized Plasticity (HELP)
An embrittlement mechanism associated with hydrogen-dislocation interactions in the volume of the material, resulting in a significant localization of plasticity, leading to a drop in macroscopic ductility.
Damage caused...
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- Transportable gas cylinders – Hydrogen embrittlement of steels - AFNOR FD E 29-649 - 2004
- Alternatives rules for construction of high pressure vessels, Boiler and Pressure Vessel Code - ASME Section VIII, Division III - 2019
- Transportable gas cylinders – Compatibility of cylinder and valve materials with gas contents – Part 4: Tests methods for selecting steels...
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