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2. DED-LB manufactured Ti–6Al–4V–4Cu alloy : materials development, characterization, and in vivo biocompatibilityAndrej Jeromen, Anish Nair, Peter Rodič, Denis Sačer, Barbara Kapun, Maša Čater, Ana Brunčić, Katarina Kozlica, Radmila Milačič Ščančar, Andrej Cör, Edvard Govekar, Ingrid Milošev, Simon Horvat, 2025, izvirni znanstveni članek Ključne besede: Ti–6Al–4V–4Cu alloy, additive manufacturing, laser-based directed energy deposition (DED-LB), microstructure and phase analyses, corrosion, in vivo biocompatibility
Objavljeno v DiRROS: 10.11.2025; Ogledov: 614; Prenosov: 492
 Celotno besedilo (18,03 MB)
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3. Influence of particle size on powder velocity distribution at the nozzle outlet in Directed Energy DepositionTijan Mede, Andrej Jeromen, Edvard Govekar, Michael Mallon, Matjaž Godec, 2025, izvirni znanstveni članek Povzetek: Metal-based Directed Energy Deposition (DED) is considered one of the variations of additive manufacturing with the highest potential, particularly for space industry and in-orbital manufacturing. The technology however still faces various challenges, many of which can be traced back to poor control and understanding of the powder delivery. Velocity distribution of powder particles at the DED nozzle outlet has a key influence on the results of any predictive model of powder stream and yet remains largely disputed. Certain numerical studies highlighted a possible influence of powder particle size on the velocity condition at the nozzle exit, yet no experimental studies confirmed this effect. The experimental campaign described in this paper quantifies this relation between powder particle size and velocity distribution at the nozzle outlet and a strong decrease of particle speed with particle size is observed. Moreover, smaller particles are observed to travel at speeds higher than the mean carrier gas speed suggesting powder particle segregation within the nozzle as one of the mechanisms driving speed differences at the nozzle outlet.
Ključne besede: directed energy deposition, powder stream, boundary conditions, particle velocity distribution
Objavljeno v DiRROS: 19.09.2025; Ogledov: 727; Prenosov: 460
Celotno besedilo (3,42 MB)
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4. A coupled fluid-granular approach to modelling powder stream in directed energy depositionTijan Mede, Michael Mallon, Bruno Chareyre, Matjaž Godec, 2024, objavljeni znanstveni prispevek na konferenci Ključne besede: Directed Energy Deposition, powder stream, DEM, CFD, coupled simulation
Objavljeno v DiRROS: 22.08.2025; Ogledov: 994; Prenosov: 768
Celotno besedilo (744,85 KB)
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5. Composition, microstructure and corrosion resistance of DED-LB additively manufactured Ti–6Al–4V alloy : comparison with wrought alloyIngrid Milošev, Peter Rodič, Barbara Kapun, Denis Sačer, Anish Nair, Davorin Kramar, Andrej Jeromen, Edvard Govekar, 2025, izvirni znanstveni članek Ključne besede: titanium alloys, directed-energy deposition by laser beam, simulated physiological solution
Objavljeno v DiRROS: 03.06.2025; Ogledov: 892; Prenosov: 719
Celotno besedilo (30,07 MB)
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6. Additive manufacturing multi-material components of SAF 2507 duplex steel and 15-5 PH martensitic stainless steelMartina Koukolíková, Pavel Podaný, Sylwia Rzepa, Michal Brázda, Aleksandra Kocijan, 2023, izvirni znanstveni članek Povzetek: The study reports the successful deposition of 15–5 precipitation-hardened (PH) martensitic steel on SAF 2507 duplex stainless steel (and vice versa) to form functionally graded materials (FGMs) using powder-based, directed-energy-deposition (DED) technology. The evolution of the microstructure and the mechanical properties of the 15–5 PH/SAF 2507 functionally graded material in the as-built state were investigated systematically. The results proved that the microstructural transition zone (MTZ) is formed above the fusion line due to the dilution effect of both steels. The phase composition of the MTZ consists of ferrite and, in comparison to the base materials, an increased amount of austenite. The interface has the lowest hardness owing to the formation of a significant proportion of the austenitic phase. However, the tensile mechanical properties were not affected by the interface as failure occurred in both SAF 2507 and at the interface regions. The research presents a promising application of FGMs in a horizontal configuration to form a high - quality, metallurgical joint between heterogeneous materials. This study introduces a novel approach by additive manufacturing (AM) of heterogeneous multi-materials, merging the favorable properties of duplex SAF 2507 and martensitic 15-5 PH stainless steels through superior metallurgical bonding. The combination of SAF 2507 and 15-5 PH in a functionally graded material has not been previously explored, as the existing studies deal with the duplex stainless steels SAF 2507 and either martensitic stainless-steel 15-5 PH deposited separately by laser powder-bed-fusion (L-PBF) or DED methods. This research pioneers the investigation of these materials in tandem, paving the way for the development of novel FGMs with optimized properties for specific applications. The resulting FGM exhibits exceptional corrosion resistance and high strength, making it highly versatile for applications in diverse industries such as offshore oil and gas production, aerospace, aviation, and chemical processing equipment.
Ključne besede: directed energy deposition, functionally graded materials, miniaturized specimen testing methods, SAF 2507, 15-5 PH
Objavljeno v DiRROS: 04.04.2024; Ogledov: 2254; Prenosov: 686
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