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Browsing by Keyword erosion wear:

  • Bejger, Artur; Drzewieniecki, Jan (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2015)
    This article draws attention to the problems of maintaining fuel injection pumps of marine diesel engines in the conditions of use of residual fuels whose quality is steadily deteriorating, and also burned under engine’s reduced load and in situations where the international rules require a temporary change over into distillate fuels. The analysis of tribological processes occurring in hydraulic precision pairs of fuel injection pump such as barrel-plunger was presented and the types of occurring wears were discussed based on author’s own operational experience. There was pointed out the need for additional methods of verification / evaluation of technical condition using of technical diagnostic methods.
  • Patejuk, Aleksy; Krupicz, Bazyli (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The results of research on selected mechanical properties of composite material on the matrix of intermetallic phase Fe-Al reinforced with Al2O3 particles are presented. The influence of particle quantity and size on tribologic properties of selected composite material was examinedas well as the influence of resistance on erosion wear of the ma-terial was investigated. Significant improvement of properties was recorded in the com-posite material reinforced with Al2O3 particles with nickel layer placed on their surface.
  • Krupicz, Bazyli (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Erosion wear of a fan rotor blade is analysed in the paper. The calculated values of contact stresses show than mechanisms of destruction my exist during: !) perpendicular impact, 2) slip with participation of fiction forces. Materials used in the paper in conditions of stream-abrasive erosion should have potentially high tield field and low. Young's modulus.
  • Krawczyk, Janusz; Jasionowski, Robert; Ura, Daniel; Goły, Marcin; Frocisz, Łukasz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Cavitation is a one of many wear mechanisms which are related to the flow of liquid. It is one of the most destructive wear methods for stainless materials. The local changes in the pressure of the liquid stream related to the flow across the metal component cause straightening of the surface area, as well as its erosion and the formation of pits on the surface layer. The erosion value of cavitation is related to the material’s microstructure, the geometry of the element, the phase composition of the material and the surface roughness. In this paper the investigation of the cavitation process for duplex stainless steel has been performed. Samples examined in the first stages of the experiments were not significantly changed, but after a long time the hardness increase was very visible. The result of the cavitation was also cracking along the interphase boundaries, which resulted in the chipping of the material. One of the most important results was a description of the change in the wear mechanisms and its intensity during the cavitation exposure time. At first plastic micro deformation of the material’s surface occurred, then the plastic deformation increased significantly and after some time this resulted in erosion of the material and interfacial boundary decohesion; these two effects increased simultaneously. The last of the mechanisms was mechanical destabilization of the austenite, but the clear result of the mechanical destabilization of the austenite was only observed in the last sample. Martensitic transformation of the material changed the material’s mechanical properties, but for the stainless steels this resulted in electrochemical corrosion of the material, especially through the formation of an electrochemical potential between austenite and martensite.

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