A5074378724- Material Properties and Failure Mechanisms
- Engineering Diagnostics and Reliability
- Hydrogen embrittlement and corrosion behaviors in metals
- Corrosion Behavior and Inhibition
- Concrete Corrosion and Durability
- Structural Integrity and Reliability Analysis
- Microstructure and Mechanical Properties of Steels
National Academy of Sciences of Ukraine
2019-2024
G.V. Karpenko Physical-Mechanical Institute
2018-2024
The paper discusses the interaction of hydrogen with operated pipe steels under conditions modelling transportation through existing gas transmission network in Ukraine and role molecular processes corrosion hydrogenation taking into account operational factors (stresses, working environment, ageing). tests have been done on steel X70, widely used pipelines Ukrainian network. Gaseous was supplied to tested specimen's area by means electrolysis using a couple platinum electrodes power supply....
The calculation model is developed to evaluate the residual lifetime of a pipe with crack considering in-service degradation pipeline steel and effect soil corrosion. based on first law thermodynamics. problem determination period subcritical growth in reduced differential equation subjected definite initial final conditions. Obtained together boundary conditions are used for prediction made X52 steel. contains external surface semi-elliptical crack. task consists time propagation through...
Fracture surfaces of specimens the steel 15H1M1F long-term (approx. 2·105 h) operated on main steam pipelines a thermal power plant have been analysed after their mechanical testing. Fractographic analysis showed some distinctions resulted from different number shutdowns (501 and 576) units during operation. After impact toughness fracture tests, as expected, subjected to more less area ductile (subcritical) in vicinity notch or pre-crack, intergranular fragments against background typical...
The calculations of the residual lifetime long-term exploited pipes oil and gas pipelines for Х52, Х60 Х70 steels are presented taking into account their hydrogenation from internal pipe side ground corrosion external side.It is shown that steel degradation decreases essentially lifetime.Кеуwordsgas pipelines, calculating methods determining lifetime, hydrogen pipe, pipes, energy approach, concentration, stress cracking, cracking.