A5021572917- Metal Alloys Wear and Properties
- Surface Treatment and Coatings
- Material Properties and Failure Mechanisms
- Engineering Diagnostics and Reliability
- Tribology and Wear Analysis
- Engineering Technology and Methodologies
- Industrial Engineering and Technologies
- Material Properties and Applications
- Advanced machining processes and optimization
- Metal and Thin Film Mechanics
- Advanced Power Generation Technologies
- Advanced materials and composites
- Engineering and Environmental Studies
- Hydrogen embrittlement and corrosion behaviors in metals
- Polymer Science and Applications
- High Temperature Alloys and Creep
- Heat transfer and supercritical fluids
- Lubricants and Their Additives
- Coal Combustion and Slurry Processing
- Advanced Surface Polishing Techniques
- Tribology and Lubrication Engineering
- Manufacturing Process and Optimization
- High-Temperature Coating Behaviors
- Powder Metallurgy Techniques and Materials
- Mechanical Failure Analysis and Simulation
G.V. Karpenko Physical-Mechanical Institute
2019-2024
National Academy of Sciences of Ukraine
2019-2024
University of Luhansk
2015-2024
National University
2013
Volodymyr Dahl East Ukrainian National University
2004-2010
We describe the external and internal hydrogen interaction on contacting surfaces in “cylinder–piston rings” friction coupling. Under influence of high temperatures pressure, oil combustion chamber at a temperature up to 1473 K decomposes forms small amounts water. External (H2) is subsequently formed. Hydrogen removal from piston rings reduces heterogeneity structure, residual stresses, uneven physical chemical properties near-surface layers, which stress concentration and, as consequence,...
Purpose: The aim of the proposed research is to investigate hydrogen effect on high-nickel steel surface properties changing during machining and wear with participation lubricant-cooling environments. Design/methodology/approach: approach fracture mechanics physicalchemical methods investigation was used formulate conclusions. Applying (liquid, solid, gaseous) technological environments (LCTE) has change morphology chips roughness contact 23Ni1Mo3Ti surfaces depending experimentally fixed...
The article is devoted to the following issues: boiling of fluid in cooling jacket engine cylinder head; agents that influenced thermal conductivity coefficient nanofluids; behavior nanoparticles and devices with engine’s head system. permissible temperature level internal combustion engines ensured by intensification heat transfer systems due change coolants “light” “heavy” nanoparticles. It was established introduction aluminum oxide Al2O3 into water a mass concentration 0.75% led an...
This paper is devoted to the development of hydrogen-containing, environmentally safe, fire-resistant, and corrosion-protected lubricant cooling liquids (LCLs) from vegetable oils with improved sanitary hygienic parameters for machining parts equipment made high-strength steels application during interoperation period in turbine halls. The use plant raw materials as ecologically fire-safe LCLs increased efficiency when evaluating drilling steel terms dependence stability cutting tool on...
Purpose: This paper is devoted the investigation hydrogen influence on of wear resistance high nitrogen steel (HNS) at dry and solid state lubricants assistant friction. It has been established that after hydrogenation 250 N loading rate increased by 2.9 ... 4.1 times. Microhardness hydrogenated layer was 7.6 8.2 GPa, in two After adding (GaSe)xIn1-x compounds to tribo conjugates X-ray diffraction analysis it appearance new phases which formed during friction process detected surface....
It has been emphasizing the importance of wear products identification during automotive tribotechnical system operation. Some examples and concepts combining applying computer vision, artificial intelligence, big data techniques to identify presented. Several proposed technology for recognizing are The following algorithm was used obtain surface shape particles. On original image, an area corresponding studied object is allocated. In this case, high reflectivity particles compared with...
Changes in the properties of 38KhN3MFA steel, from which rotor shaft is made, were investigated by comparing hardness surface and hydrogen concentration chips analyzing changes morphology under influence various factors. The microstructures obtained samples are presented, histograms reflecting parameters structural components constructed. An abbreviated diagram “life cycle” turbine given. It was found that, during long-term operation (up to 250 thousand hours), decreases 290 HB HB. recorded...
In this study, modern nitrogen steels used for the manufacture of rings Honda engines (70CC, 90CC, CRF70F, XL70, XR70, C70, CT70, ATC70, CL70) as well other transport tribotechnical units was investigated. Due to present ecological situation in world, new environmentally friendly lubricating fluids steels’ and surface treatments have been proposed. The results tests are presented form diagrams, graphs step polynomials obtained by mathematically describing changes wear intensity when load...
This paper briefly describes the conceptual direction of application computer vision (CV) methods that involve controlling morphology hydrogenated wear particles (WPs). During long-term operation, in surface and subsurface layers materials parts tribo-joint, changes micromechanisms fracture occur, which change WPs. It has been shown developed program (CP) can be used to monitor fractography particles, and, accordingly, it is possible control morphology. Therefore, predict operational...
Rotor shafts are the most heavily loaded and accident-prone parts of powerful turbine generators, which cooled using hydrogen. To eliminate damage sustained during operations, repair work was carried out, including removal defective parts, surfacing, turning. This study tested machinability rotor shaft prototypes made from 38KhN3MFA steel. A section degraded due to prolonged operation (250 thousand hours), compared central part, a decrease in average grain size 21.57 μm 12.72 an increase...