Blar i NTNU Open på forfatter "Kontis, Paraskevas"
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Boron trapping at dislocations in an additively manufactured polycrystalline superalloy
Antonov, Stoichko; Després, Arthur; Mayer, Charlotte; Martin, Guilhem; Kontis, Paraskevas (Peer reviewed; Journal article, 2023)Segregation of solutes at dislocations in a nickel-based superalloy produced by laser powder bed fusion was investigated. Transmission electron microscopy has shown a high dislocation density present in the as-built ... -
Chemical redistribution and change in crystal lattice parameters during stress relaxation annealing of the AD730 TM superalloy
Durand, Malik; Cormier, Jonathan; Paumier, Fabien; Katnagallu, Shyam; Saksena, Aparna; Kontis, Paraskevas; Pettinari-Sturmel, Florence; Hantcherli, Muriel; Franchet, Jean-Michel; Dumont, Christian; Bozzolo, Nathalie (Peer reviewed; Journal article, 2022)The present study aims to understand the underlying mechanisms of macroscopic contraction that occurs in γ/γ′ nickel based superalloys submitted to isothermal annealing and resulting in stress relaxation retardation. Samples ... -
Creep deformation of an additively manufactured nickel-based superalloy
Vad, Olav Johansen (Master thesis, 2022)To versjoner av en nikkelbasert superlegering ble produsert med additiv tilvirkning og karakterisert etter sigetesting med SEM og atomprobetomografi. De to legeringene ble kalt CB og C da hovedforskjellen i mellom dem var ... -
The effect of grain size and rolling reduction on microstructure evolution and annealing hardening response of a Mg-3Gd alloy
Han, F.; Luo, X.; Liu, Q.; Hou, Z.; Marthinsen, Knut; Wu, G.L.; Hatzoglou, Constantinos; Kontis, Paraskevas; Huang, X. (Journal article; Peer reviewed, 2024)Mg-3Gd (wt.%) samples with different initial grain sizes were prepared to evaluate the grain size effect on microstructural evolution during cold rolling and subsequent annealing hardening response. The deformation behavior ... -
Effect of hybridization in PdAlY-(Ni/Au/Ir) metallic glasses thin films on electrical resistivity
Bishara, Hanna; Kontis, Paraskevas; Dehm, Gerhard; Schneider, Jochen M.; Evertz, Simon (Peer reviewed; Journal article, 2022)Thin film metallic glasses (MGs) are promising materials for electronic applications. While the transport properties of MGs are composition dependent, the influence of hybridization on the resistivity has not been investigated ... -
The effect of well temperature on the microstructure and the mechanical performance of bismuth-based plugs in well plugging and abandonment operations
Manataki, Andriani; Hmadeh, Lewaa; Sørensen, Bjørn Eske; Kontis, Paraskevas; Sangesland, Sigbjørn (Journal article; Peer reviewed, 2024)Bismuth-tin (BiSn) alloys are considered promising candidates as potential alternatives to cement for well plugging and abandonment (P&A) applications to prevent any uncontrolled flow of deep reservoir fluids to the surface. ... -
The effect of γ matrix channel width on the compositional evolution in a multi-component nickel-based superalloy
Saksena, Aparna; Kubacka, Dorota; Gault, Baptiste; Spiecker, Erdmann; Kontis, Paraskevas (Peer reviewed; Journal article, 2022)High-temperature diffusion affects the long-term stability of superalloys and hence their service life. Yet, details of the mechanisms remain elusive. Here, the γ-γʹ microstructure itself is used as a nanoscale diffusion ... -
Modelling of additive manufacturability of nickel-based superalloys for laser powder bed fusion
Jinghao, Xu; Kontis, Paraskevas; Ru, Peng; Johan, Moverare (Peer reviewed; Journal article, 2022)The additive manufacturability of nickel-based superalloys for laser powder bed fusion (LPBF) technologies is studied by considering the in-process cracking mechanisms. The additive manufacturability of nickel-based ...