Hydrogen Cooling of Turbo Aggregates and the Problem of Rotor Shafts Materials Degradation Evaluation

• DOI: 10.3390/en16237851
• Publication Date: 2023-11-30T14:37:54Z
• Authors: Alexander I. Bali...; Andriy M. Syrotyuk; Maria R. Havrilyuk; Valentina O. Bali...; Valerii O. Kolesn...; Ljubomyr M. Ivask...
• Keywords: Technology; environmentally friendly lubricating cooling liquid; T; hydrogen-containing media; 02 engineering and technology; long-term operation; 0210 nano-technology; computer vision; chipping; image processing

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 microstructure hours operation, amount cementite decreased 87% 62%, proportion free ferrite increased 5% 20%. average values microhardness 1.9 GPa 1.5 GPa. increase content alloying elements carbides recorded: Cr V—by 1.15–1.6 times; Mo—by 2.2–2.8 times. With help developed program (using computer vision methods), their microrelief detected study photos chips.