A5101860336- Hydrogen embrittlement and corrosion behaviors in metals
- Material Properties and Failure Mechanisms
- Corrosion Behavior and Inhibition
- Fatigue and fracture mechanics
- Structural Integrity and Reliability Analysis
- Organometallic Complex Synthesis and Catalysis
- Synthetic Organic Chemistry Methods
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Non-Destructive Testing Techniques
- Carbon Nanotubes in Composites
- Advanced Polymer Synthesis and Characterization
- Muon and positron interactions and applications
- biodegradable polymer synthesis and properties
- Geotechnical Engineering and Underground Structures
- Diamond and Carbon-based Materials Research
- Microstructure and mechanical properties
- Offshore Engineering and Technologies
- High voltage insulation and dielectric phenomena
- Metallurgy and Material Forming
- Catalytic Processes in Materials Science
- Mechanical stress and fatigue analysis
- Dendrimers and Hyperbranched Polymers
- Mesoporous Materials and Catalysis
- Dielectric materials and actuators
Institute of Solid State Physics
2024
Chinese Academy of Sciences
2024
Stantec (Canada)
2018-2019
University of Alberta
2014-2017
Beijing University of Chemical Technology
2013
Muons (United States)
2010
Chongqing University
2010
Abstract Despite decades of research, the mechanisms near‐neutral pH stress corrosion cracking pipeline steel are still not fully understood. This investigation was aimed to understand effect minor cycles with very high R ratios (minimum stress/maximum stress) on crack growth in air and environments. It has been demonstrated that cycle, even an ratio as 0.9, could significantly contribute steels presence a large underload cycle low 0.5 environment. Comparing constant amplitude tests,...
In this investigation, analyses of pressure fluctuations during oil and gas pipeline operations are performed. The performed in a way to capture all the variables their magnitudes terms crack growth rate. It is found that spectra can be categorized into three main types: underload-dominant, mean load-dominant, overload-dominant spectra, depending on locations with respect compressor or pump station. underload spectra—typical at discharging sites—are most severe as these subjected highest...
A novel type of nano template was prepared by loading a Ziegler–Natta catalyst on nanosized carbon spheres for ethylene polymerization to form polyethylene (PE) particles; triethylaluminum (AlEt3) used as co-catalyst. The results revealed that the templates were spherical and their average diameter ∼180 nm. had high titanium content 4.5 wt %, determined inductively coupled plasma (ICP) emission spectroscopy catalytic activity (up 7.68 × 105 gPE/((mol Ti) h) polymerization. Polyethylene...
This research aims at understanding the crack propagation behavior of pipeline steels under variable pressure fluctuations in a near-neutral pH environment. Although have been recognized as driving force for crack growth more than two decades, mechanisms governing their effects on crack growth yet to be determined. Existing models that consider effect pressure fluctuations are established primarily by assuming fatigue loading with constant stress amplitudes. often yields predicted life...
From extensive investigations for over 30 years since the discovery of near-neutral pH stress corrosion cracking (NNpHSCC), physical processes crack initiation and growth have been determined, despite that some details in various aspects are still to be understood. The curve is a function by direct dissolution steels at localized areas on pipe surface during or tip early stage (the curve), process involving interaction fatigue hydrogen embrittlement (corrosion fatigue, enhanced curve) Stage...
Pressure fluctuations are recognized as the driving force for crack growth of pipeline steels in near-neutral pH environments; however, mechanisms still not fully understood. Difficulty understanding is present due to two dilemmas between laboratory testing and field findings: high frequency study versus low pressure field; constant amplitude cyclic tests random actual spectra. To bridge dilemmas, behavior X60 steel was investigated solution at frequencies 1×10−5 Hz under variable loading....
Hydrogen embrittlement is one of the most severe steel degradation mechanisms. Using hydrogen enhanced decohesion (HEDE) and local plasticity (HELP), we can predict if more atoms will accumulate into plastic zone, enhancing crack growth rate. In current study, a relationship has been proposed between operations pipeline steels accumulation to quantify effects embrittlement. The study find that rate proportional stress intensity inversely temperature; hence, higher lower temperature enhance...
Abstract Some liquid pipeline operators are experiencing an upward trend in operating temperatures. This is influenced by increasing flowrate through fixed inventory (viscous heating), hotter product entering some pipelines, and environmental warming (less heat loss to soil atmosphere). While temperature known increase the degradation rate of coatings often-mentioned Arrhenius Equation suggests chemical reaction could double with every 10°C increase, true effect on corrosion not fully...
Although stress corrosion cracking (SCC) growth is attributed to the synergistic effects of and corrosion, these two factors can just as easily become competing mechanisms, with cycles driving (hydrogen, by-product may facilitate growth), working blunt crack tip arrest growth. It follows that reducing maximum pressure cycling severity slow down or even stop it, aggressive further sharp tip. The Authors have observed, on a particular Polyethylene (PE) tape coated pipeline, instances where SCC...