Degradation of steel weldments under combined creep and hydrogen attack conditions
This paper presents preliminary results obtained under hydrogen attack conditions on standard and V-modified steels and weldments for pressure vessel applications. Tests have been carried out on welded pieces in hot high-pressure hydrogen in stress-free conditions and under uniaxial and multiaxial creep loading. In all cases, the Heat Affected Zones were identified as the most sensitive areas. These findings can be explained based on the characterization of carbides in the materials tested, which was carried out via TEMIEDS. In particular, the strong degradation of the Fine-Grained Heat Affected Zone compared with the base and the weld metal can be justified with the relatively low density of thermodynamically stable metal carbides which is observed in this region.
Bibliographic Reference: An oral report given at: EUROMAT 2001 Conference. Organised by: AIM. Held in: Palacongressi Rimini (IT), 10-14 June 2001
Record Number: 200013517 / Last updated on: 2001-07-25
Original language: en
Available languages: en