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Sökning: WFRF:(Rajulapati Koteswararao V.)

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1.
  • Algenaid, Wael, 1992-, et al. (författare)
  • Influence of microstructure on the erosion behaviour of suspension plasma sprayed thermal barrier coatings
  • 2019
  • Ingår i: Surface & Coatings Technology. - : Elsevier BV. - 0257-8972 .- 1879-3347. ; 375, s. 86-99
  • Tidskriftsartikel (refereegranskat)abstract
    • Thermal barrier coatings (TBCs) are applied on the surface of hot parts of gas turbine engines to increase the turbine efficiency by providing thermal insulation and to protect the engine parts from the harsh environment. Typical degradation of TBCs can be attributed to bond coat oxidation, thermal stress etc. In addition to this, erosion can also lead to partial or complete removal of the TBCs especially when the engine operates under erosive environment such as flying over desert area, near active volcanic or offshore ocean environment. Suspension Plasma Spraying (SPS) is a promising technique for TBC applications by virtue of its ability to produce a strain-tolerant porous-columnar microstructure that combines the benefits of both electron beam physical vapor deposited (EB-PVD) as well as atmospheric plasma sprayed (APS) coatings. This work investigates the influence of various coating microstructures produced by SPS on their erosion behavior. Six different coatings with varied microstructures produced using different suspensions with distinct characteristics were studied and their erosion resistance was compared. Results showed significant influence of SPS TBCs microstructures on the erosion resistance. Furthermore, the erosion resistance of SPS TBCs showed a close correlation between fracture toughness and the erosion rate, higher fracture toughness favours superior erosion resistance. © 2019 Elsevier B.V.
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2.
  • Goel, Sneha, et al. (författare)
  • Role of HIPing and Heat Treatment on Properties of Alloy 718 Fabricated by Electron Beam Melting
  • 2019
  • Ingår i: Euro PM 2019 Congress and Exhibition.
  • Konferensbidrag (refereegranskat)abstract
    • Although additive manufacturing (AM) of difficult-to-machine materials can open new design possibilities for production of parts with complex geometries, AM builds are characterized by presence of detrimental defects like shrinkage/ gas porosity and lack-of-fusion. Microstructural inhomogeneity, anisotropy in properties and formation of undesirable phases are added concerns. Motivated by the need for investigation of appropriate thermal post-treatments to eliminate defects, and to achieve desired microstructural and mechanical properties, the influence of hot isostatic pressing (HIPing) and heat treatment on electron beam melted (EBM) Alloy 718 specimens built at different heights from the base-plate has been studied. While HIPing led to orders of magnitude reduction in defect content, conventional heat treatment without applied pressure was found to have no effect. Thermal post-treatment was found to eliminate inherent variability in phase constitution and hardness of as-built specimens. HIPing at high temperature was accompanied by grain coarsening, suggesting modification of the HIPing protocol.
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  • Resultat 1-2 av 2

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