A study of crack growth in heat affected zones produced by welding in a microalloyed pipeline steels under SCC conditions
- UNAM, Cuernavaca (Mexico)
- Univ. of Wisconsin, Milwaukee, WI (United States). Materials Dept.
The changes introduced in the microstructure of microalloyed pipeline steels by arc welding caused more difficulties in the prediction of crack propagation. In the present work, the authors analyzed pipeline steel welding perpendicular to the rolling direction, using a single-V joint design with a 60-deg angle, under sulfide stress corrosion cracking conditions. The heat affected zones (HAZ) were confined in compact tension samples. Tests were carried out in synthetic sea-water saturated with hydrogen sulfide, using the potential drop technique to measure the crack propagation. The results show that, in the mode 1, the crack growth occurs along the grain boundaries. The microstructure, which was partially recrystallized, shows that the crack propagation is produced by hydrogen embrittlement. However, the cracks observed in the weld metal are transgranular.
- OSTI ID:
- 268242
- Report Number(s):
- CONF-960389-; TRN: IM9634%%314
- Resource Relation:
- Conference: National Association of Corrosion Engineers (NACE) annual corrosion conference and exposition: water and waste water industries, Denver, CO (United States), 24-29 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of Corrosion/96 conference papers; PB: [6615] p.
- Country of Publication:
- United States
- Language:
- English
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