1. Tribological performance of heat-treated Al6061 hybrid metal-matrix compositesA. D. Pradeep, K. Kannakumar, Vignesh Kumar S., S. Manojkumar, V. D. Tamilarasan, 2026, izvirni znanstveni članek Ključne besede: hybrid metal-matrix composites, heat treatment, dry-sliding wear, tungsten carbide nanoparticle
Objavljeno v DiRROS: 22.06.2026; Ogledov: 295; Prenosov: 221
 Celotno besedilo (1,95 MB)
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3. Influence of carbide morphology and matrix hardness on the sliding wear behaviour of tool steelsMarko Sedlaček, Božo Skela, Bojan Podgornik, 2026, izvirni znanstveni članek Povzetek: When using tool steels with martensitic microstructure, the hardness is regarded as one of the main criteria defining its wear properties. The premise is that the harder the material, the greater the sliding wear resistance. This is especially common when using tool steels, as the highest possible hardness is pursued, but the influence of the microstructure is often neglected. Presence of different carbides in terms of fraction, type and size (morphology) in martensitic matrix has different effects on wear, especially if matrix hardness changes. The objective of this study was to establish a correlation between the fraction and morphology of V and Cr-rich carbides in tool steel with its microstructure, fracture toughness, and overall influence on material sliding wear resistance. To achieve this, commercially available tool steels (Mat. No. 1.2379 cold work tool steel and modified Mat. No. 1.2367 hot work tool steel) were selected, exhibiting notably diverse microstructures, particularly in terms of carbide fraction and morphology. To enable a direct comparison, both steels underwent heat treatment to attain three distinct hardness levels: 45 + /-1 HRC, 49 + /-1 HRC, and 54 + /-1 HRC. Sliding wear resistance and behavior under various contact conditions were correlated with microstructure, specifically focusing on hard carbides. Additionally, the study examined the effect of wear particles being trapped within or removed from the tribological contact. It was observed that the sliding wear behavior is significantly influenced when the microstructure comprises a martensitic matrix with a higher fraction of carbides, particularly coarse eutectic M7C3 carbides, especially if the matrix hardness is insufficient. Matrix hardness plays a crucial role in preventing carbide detachment from the matrix. Plastic deformation of the tempered martensite matrix, along with carbide cracking and detachment from the matrix, was identified as contributing factors intensifying wear during the wear process.
Ključne besede: tool steel, hardness, sliding wear, carbide fraction, fracture toughness, reciprocating sliding, third-body abrasion
Objavljeno v DiRROS: 30.03.2026; Ogledov: 411; Prenosov: 352
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4. Deep learning-based prediction and experimental evaluation of mechanical properties in basalt-fiber-SiC-reinforced hybrid epoxy compositesSM Ravikumar, JM Prabhudass, A Adinaryanan, N. Yuvaraj, S. Dinesh, Elakkiya Azhagar, 2026, izvirni znanstveni članek Ključne besede: basalt fiber, silicon carbide filler, mechanical properties, deep neural network, hybrid composite for structural applications
Objavljeno v DiRROS: 26.02.2026; Ogledov: 666; Prenosov: 330
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5. Anisotropic microstructural evolution of (001), (110) and (111) planes in SRR99 single-crystal superalloyXiaoli Zhang, Kuan Lei, Tingzhen Xin, Yishan Wu, Guiqun Liu, 2025, izvirni znanstveni članek Ključne besede: single-crystal superalloy, γ phase, γ' phase, dendrite morphology, eutectic, carbide
Objavljeno v DiRROS: 08.01.2026; Ogledov: 913; Prenosov: 382
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6. Deuterium retention in tungsten, tungsten carbide and tungsten-ditungsten carbide compositesPetra Jenuš, Anže Abram, Saša Novak, Mitja Kelemen, Matic Pečovnik, Thomas Schwarz-Selinger, Sabina Markelj, 2023, izvirni znanstveni članek Povzetek: The selection of the most suitable material for the EU DEMO divertor is still underway. Current research focuses on the development of tungsten-based materials for plasma-facing applications. In addition to other requirements, the candidate material must also exhibit low intrinsic hydrogen isotope retention. To verify the suitability of the tungsten carbide-containing materials, we examined the effect of carbon in the form of carbide or free carbon on deuterium (D) retention. The samples were consolidated by Field Assisted Sintering (FAST) and examined in terms of phase composition and microstructure before the d-retention studies. The Nuclear Reaction Analysis (NRA) technique was used to determine the depth distribution of D after the exposure to D plasma (fluence of 1.3 × 1024 D/m2 and 1.3 × 1025 D/m2 and an exposure temperature of 370 K and 523 K, respectively). Thermal Desorption Spectroscopy (TDS) was used to measure the D desorption spectra. The surfaces of samples exposed to D plasma were also examined in terms of microstructure by scanning electron microscopy. The study has shown that apart from the d-fluence and exposure temperature, the materials’ composition plays a vital role in d-retention, accompanied by blisters and pillar formation. The lowest d-retention was observed for tungsten and the highest in the W-W2C composite. The blisters and pillars were formed in these two materials but not in the WC, which also contains free carbon. At higher D fluence, approximately 15 to 20-times more blisters and pillars were formed in the W-W2C composite than in the tungsten prepared by the same method. The results suggest that the number of defects causing higher d-retention is the highest in W-W2C. On the other hand, the absence of surface irregularities in the WC-C sample after D retention studies indicates that the cause for higher D retention does not lie in the carbides, but, presumably, the microstructural and crystal lattice defects govern the D retention in tungsten-tungsten carbide systems.
Ključne besede: tungsten, (di)tungsten carbide, deuterium, nuclear reaction analysis, thermal desorption spectroscopy
Objavljeno v DiRROS: 03.09.2025; Ogledov: 931; Prenosov: 526
Celotno besedilo (5,58 MB)
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7. Fracture analysis of cemented-carbide inserts for the dry cutting of repen limestoneJože Kortnik, Boštjan Markoli, Matej Zupančič, Adam Zaky, Iztok Naglič, 2025, izvirni znanstveni članek Ključne besede: cemented carbide, fracture analysis, stone cutting inserts, chainsaw machine
Objavljeno v DiRROS: 11.04.2025; Ogledov: 1170; Prenosov: 653
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9. Insights into microstructural evolution of tungsten-tungsten carbide plasma facing composite materials prepared by field assisted sintering techniqueAljaž Iveković, Matej Kocen, Petra Jenuš, Anže Abram, Črtomir Donik, Saša Novak, 2023, izvirni znanstveni članek Ključne besede: tungsten, tungsten carbide, interface, microstructure, fusion energy
Objavljeno v DiRROS: 07.02.2024; Ogledov: 1773; Prenosov: 1627
Celotno besedilo (14,95 MB)
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