21. A hybrid radial basis function-finite difference method for modelling two-dimensional thermo-elasto-plasticity : Application to cooling of hot-rolled steel bars on a cooling bedGašper Vuga, Boštjan Mavrič, Umut Hanoglu, Božidar Šarler, 2024, izvirni znanstveni članek Povzetek: This paper represents Part 2 of the parallel paper Part 1, where the strong form hybrid RBF-FD method was developed for solving thermo-elasto-plastic problems. It addresses the industrial application of this novel meshless method to steel bars cooling on a cooling bed (CB) where the formation of residual stress is of primary interest. The study investigates the impact of the distance between the bars and the distance to the heat shield above the CB on radiative heat fluxes and, consequently, on thermo-mechanical response. The thermal model is solved on bars cross-section with a RBF-FD method where augmented polyharmonic splines are used for the local approximation. View factors, computed with a Monte-Carlo method, are included in radiative heat fluxes. The thermal solution is incrementally applied on a mechanical model that assumes a generalised plane strain state and captures bars bending. The study employs a hybrid RBF-FD method to resolve a nonlinear discontinuous mechanical problem successfully. The simulation of the process shows how different process parameters influence the thermo-mechanical response of the bars.
Ključne besede: steel bars, cooling bed, thermo-mechanical modelling, hybrid radial basis function, generated finite differences, residual stresses
Objavljeno v DiRROS: 28.02.2024; Ogledov: 138; Prenosov: 103
 Celotno besedilo (8,55 MB)
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22. Grain size distribution of DP 600 steel using single-pass asymmetrical wedge testUrška Klančnik, Peter Fajfar, Jan Foder, Heinz Palkowski, Jaka Burja, Grega Klančnik, 2023, izvirni znanstveni članek Ključne besede: wedge test, hot-rolling, grain size distribution, dual-phase steel
Objavljeno v DiRROS: 07.02.2024; Ogledov: 207; Prenosov: 87
Celotno besedilo (4,64 MB)
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23. Possibilities for improvement of mechanical properties of high-strength medium-carbon SiCr steelsPavel Salvetr, Jakub Kotous, Črtomir Donik, Aleksandr Gokhman, Zbyšek Nový, 2023, izvirni znanstveni članek Ključne besede: spring steel, 54SiCr6 steel, microstructure, mechanical properties
Objavljeno v DiRROS: 02.02.2024; Ogledov: 261; Prenosov: 84
Celotno besedilo (1,44 MB)
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24. Austenite reversion suppression with deep cryogenic treatment : a novel pathway towards 3rd generation advanced high-strength steelsPatricia Jovičević Klug, Matic Klug Jovičević, Lars Thormählen, Jeffrey McCord, Michael Rohwerder, Matjaž Godec, Bojan Podgornik, 2023, izvirni znanstveni članek Ključne besede: Martensitic stainless steel, deep cryogenic treatment, microstructure, mechanical properties, microstructural transformations, phase transformation
Objavljeno v DiRROS: 02.02.2024; Ogledov: 185; Prenosov: 93
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25. Effect of double-step and strain-assisted tempering on properties of medium-carbon steelPavel Salvetr, Andrea Školáková, Jakub Kotous, J. Drahokoupil, Daniel Melzer, Zdeňek Jansa, Črtomir Donik, Aleksandr Gokhman, Zbyšek Nový, 2023, izvirni znanstveni članek Ključne besede: medium-carbon steel, tempering, strengthening, mechanical properties, microstructure
Objavljeno v DiRROS: 02.02.2024; Ogledov: 187; Prenosov: 88
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26. Effect of Cu alloying on mechanical properties of medium-c steel after long-time tempering at 500 °CPavel Salvetr, Aleksandr Gokhman, Milan Svoboda, Črtomir Donik, Ivana Podstranská, Jakub Kotous, Zbyšek Nový, 2023, izvirni znanstveni članek Ključne besede: long-time tempering, strengthening, Cu precipitate, medium-C steel, mechanical properties
Objavljeno v DiRROS: 02.02.2024; Ogledov: 232; Prenosov: 87
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27. Complex interdependency of microstructure, mechanical properties, fatigue resistance, and residual stress of austenitic stainless steels AISI 304LPatricia Jovičević Klug, Matic Klug Jovičević, Michael Rohwerder, Matjaž Godec, Bojan Podgornik, 2023, izvirni znanstveni članek Ključne besede: stainless steel, AISI 304L, deep cryogenic treatment (DCT), microstructure, mechanical properties, fatigue, residual stress
Objavljeno v DiRROS: 02.02.2024; Ogledov: 211; Prenosov: 91
Celotno besedilo (5,90 MB)
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28. Tribological evaluation of vegetable ▫$oil/MoS_2$▫ nanotube-based lubrication of laser-textured stainless steelMarjetka Conradi, Bojan Podgornik, Maja Remškar, Damjan Klobčar, Aleksandra Kocijan, 2023, izvirni znanstveni članek Povzetek: In the present work, the functionalisation of austenitic stainless steel, AISI 316L surfaces via nanosecond Nd:YAG laser texturing in order to modify the surface morphology with crosshatch and dimple patterns is presented. A tribological analysis under lubrication with sunflower and jojoba oil with and without the addition of a solid lubricant, MoS2 nanotubes, was performed. In conjunction with friction/wear response laser-textured surface wettability, oil spreadability and oil retention capacity were also analysed. It was shown that the crosshatch pattern generally exhibited lower friction than the dimple pattern, with the addition of MoS2 nanotubes not having any significant effect on the coefficient of friction under the investigated contact conditions. This was found in addition to the better oil spreadability and oil retention capacity results of the crosshatch-textured surface. Furthermore, texturing reduced the wear of the stainless-steel surfaces but led to an approximately one order of magnitude larger wear rate of the steel counter-body, primarily due to the presence of hard bulges around the textured patterns. Overall, the crosshatch pattern showed better oil retention capacity and lower friction in combination with different vegetable oils, thus making it a promising choice for improving tribological performance in various environmentally friendly applications.
Ključne besede: tribology, stainless steel, vegetable oil lubrication, MoS2 nanotubes
Objavljeno v DiRROS: 02.02.2024; Ogledov: 153; Prenosov: 82
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29. Aspects of bending high-borated austenitic stainless steel sheets for interim storage of spent nuclear fuelJosef Odehnal, Tomáš Studecký, Petra Čejková, Ivana Poláková, Martin Rund, Václav Bruná, Petr Martinek, Pavel Francisko, Črtomir Donik, 2023, izvirni znanstveni članek Ključne besede: interim storage, spent fuel, borated stainless steel, cold working, bending
Objavljeno v DiRROS: 01.02.2024; Ogledov: 169; Prenosov: 77
Celotno besedilo (10,05 MB)
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30. Influence of boron and nitrogen on the machinability, polishability and wear of martensitic stainless steelsMarko Sedlaček, Barbara Šetina, Vesna Žepič Bogataj, Jaka Burja, 2023, izvirni znanstveni članek Ključne besede: martensitic stainless steel, boron, nitrogen, wear, machinability, polishability
Objavljeno v DiRROS: 01.02.2024; Ogledov: 189; Prenosov: 92
Celotno besedilo (7,53 MB)
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