Degradation of the pipe-steel structure upon long-term operation in contact with a hydrogen sulfide-containing medium

The phase composition and structure of defect portions of pipelines after long-term service in contact with a hydrogen sulfide-containing medium have been investigated. From structural changes, the process of the initiation of cracks and fracture of a low-carbon ferritic-pearlitic steel containing s...

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Bibliographic Details
Published in:Physics of metals and metallography 2011-03, Vol.111 (3), p.281-293
Main Authors: Schastlivtsev, V. M., Tabatchnikova, T. I., Tereshchenko, N. A., Yakovleva, I. L.
Format: Article
Language:English
Subjects:
Analysis
Carbides
Carbon steel
Cementite
Chemistry and Materials Science
Contact
Crack initiation
Degradation
Diffusion
Dislocations
Fracture mechanics
Hydrogen sulfide
Intermetallic compounds
Iron compounds
Materials Science
Metallic Materials
Phase Transformations
Structural steels
Structure
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Summary:The phase composition and structure of defect portions of pipelines after long-term service in contact with a hydrogen sulfide-containing medium have been investigated. From structural changes, the process of the initiation of cracks and fracture of a low-carbon ferritic-pearlitic steel containing slag-induced laminations and precipitates of sulfides of the (Fe,Mn)S type has been reconstructed. The conditions under which a block cementite substructure is formed in the course of service and a transformation of the plate-type shape of the carbide phase occurs have been analyzed. It has been established that the dispersed carbides precipitating in this case limit the mobility of dislocations and thereby favor degradation of service properties of the pipe steel.
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X11020128