A5087157426- Material Properties and Failure Mechanisms
- Engineering Diagnostics and Reliability
- Hydrogen embrittlement and corrosion behaviors in metals
- Fatigue and fracture mechanics
- Material Properties and Applications
- Corrosion Behavior and Inhibition
- Surface Treatment and Coatings
- Surface Treatment and Residual Stress
- Metal and Thin Film Mechanics
- Industrial Engineering and Technologies
- Magnesium Alloys: Properties and Applications
- Microstructure and Mechanical Properties of Steels
- Microstructure and mechanical properties
- Non-Destructive Testing Techniques
- Metal Alloys Wear and Properties
- Shape Memory Alloy Transformations
- Engineering and Environmental Studies
- Advanced Power Generation Technologies
- Lubricants and Their Additives
- Structural Integrity and Reliability Analysis
- Aluminum Alloys Composites Properties
- Electromagnetic Effects on Materials
- Structural mechanics and materials
- Elasticity and Wave Propagation
- Fire effects on concrete materials
G.V. Karpenko Physical-Mechanical Institute
2015-2024
National Academy of Sciences of Ukraine
2015-2024
National Academy of Sciences
2009-2015
Ivano-Frankivsk National Technical University of Oil and Gas
2004
Warsaw University of Technology
2004
This paper summarizes a series of the authors’ research in field assessing operational degradation oil and gas transit pipeline steels. Both mechanical electrochemical properties steels are deteriorated after operation, as is their resistance to environmentally-assisted cracking. The characteristics brittle fracture stress corrosion cracking decrease most intensively, which associated with development in-bulk dissipated microdamages material. sensitive indicators changes material’s state...
With the development of natural gas industry, transmission pipelines have been developed rapidly in terms safety, economy and efficiency. Our recent studies shown that an important factor main serviceability loss under their long-term service is in-bulk metal degradation pipe wall. This leads to initial mechanical properties, primarily, resistance brittle fracture, which were set engineering calculations at pipeline design stage. At same time stress corrosion cracking has identified as one...
The susceptibility of various sections a gas distribution pipeline, operated for 52 years, to hydrogen embrittlement was analyzed. specimens base metal and welded joint, cut out transversally the pipe generatrix, tested. brittle fracture resistance assessed based on temperature dependences impact toughness changes in steel plasticity after its electrolytic charging. A critically low determined both joint state. It revealed that preliminary charging caused loss, which more pronounced state material.
The operational embrittlement based on the determination of impact toughness KCV longitudinal and transverse to rolling direction specimens API 5L X67 steel reserve pipes operated for 34 years gas main pipeline was investigated. influence different orientations notch in relative pipe axis analyzed a significant this factor revealed, which is generally higher with oriented short transversal direction. sensitivity degradation highest tests concentrator axial Using macrofractographic analysis,...
Abstract The thorough mechanical, corrosion‐mechanical, hydrogen permeation studies of X52 steel in as‐received condition and after 30 years service gas pipeline have shown the degradation bulk metal properties due to exploitation. structure exploited steels decreased resistance crack propagation, stress corrosion cracking (SCC), HE HIBC. exhibited specific anomalies mechanical behaviour: (1) decrease brittle fracture with simultaneous hardness; (2) opposite change plasticity parameters: RA...
Long-term operation of oil and gas pipeline steels causes a significant worsening their mechanical properties, especially characteristics brittle fracture resistance. General regularities in-service degradation are analysed in the paper. Basing on these, two stages steel distinguished: deformation aging in-bulk dissipated microdamaging. Hydrogenation intensifies damaging process due to hydrogen induced microcracking and, this way, facilitates its operational degradation. In-service...
Hydrogen will play a significant role in decarbonised energy system the coming decades. Extensive infrastructure exists for distribution of natural gas and it is an obvious step to assess be used supply hydrogen or mixtures with gas. The durability integrity issues existing steel pipelines associated embrittlement at transporting are considered. Two mechanisms hydrogenation from pipe internal surface taken into account, namely, as result electrochemical corrosion due presence moisture...
The paper presents the research results on assessment of in-service degradation 0.17 C-Mn-Si steel gas transit pipeline operated for 36 years. High degree was manifested in a significant decrease plasticity characteristics, impact toughness and resistance to stress corrosion cracking hydrogen embrittlement compared as-delivered steel. tests carried out using low method revealed changes elastic hysteresis, elasticity modulus relative residual deformation depending its state (as-delivered...