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Iskalni niz: "avtor" (Bojan Podgornik) .

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Dry-sliding wear resistance of AISI H11-type hot-work tool steel
Gašper Puš, Borut Žužek, Agnieszka Guštin, Bojan Podgornik, 2023, izvirni znanstveni članek

Ključne besede: hot-work tool steel, friction, sliding wear, mechanical properties
Objavljeno v DiRROS: 08.03.2024; Ogledov: 63; Prenosov: 37
.pdf Celotno besedilo (2,04 MB)
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Advanced materials and research for the green future
Bojan Podgornik, 2023, izvirni znanstveni članek

Ključne besede: environment, pollution, advanced materials, surface engineering, research
Objavljeno v DiRROS: 08.03.2024; Ogledov: 55; Prenosov: 34
.pdf Celotno besedilo (3,78 MB)
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Calculation of deformation-related quantities in a hot-rolling process
Franci Vode, Simon Malej, Franc Tehovnik, Boštjan Arh, Bojan Podgornik, 2023, izvirni znanstveni članek

Objavljeno v DiRROS: 02.02.2024; Ogledov: 115; Prenosov: 46
.pdf Celotno besedilo (1,39 MB)
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Tribological evaluation of vegetable ▫$oil/MoS_2$▫ nanotube-based lubrication of laser-textured stainless steel
Marjetka 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: 100; Prenosov: 56
.pdf Celotno besedilo (4,56 MB)
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Influence of oil viscosity on the tribological behavior of a laser-textured Ti6Al4V alloy
Marjetka Conradi, Aleksandra Kocijan, Bojan Podgornik, 2023, izvirni znanstveni članek

Povzetek: Laser texturing with a dimple pattern was applied to modify a Ti6Al4V alloy at the micro level, aiming to improve its friction and wear resistance in combination with oil lubrication to optimize the performance in demanding industrial environments. The tribological analysis was performed on four different dimple-textured surfaces with varying dimple size and dimple-to-dimple distance and under lubrication with three different oils, i.e., T9, VG46, and VG100, to reflect the oil viscosity’s influence on the friction/wear of the laser-textured Ti6Al4V alloy. The results show that the surfaces with the highest texture density showed the most significant COF reduction of around 10% in a low-viscosity oil (T9). However, in high-viscosity oils (VG46 and VG100), the influence of the laser texturing on the COF was less pronounced. A wear analysis revealed that the laser texturing intensified the abrasive wear, especially on surfaces with a higher texture density. For low-texturing-density surfaces, less wear was observed for low- and medium-viscosity oils (T9 and VG46). For medium-to-high-texturing densities, the high-viscosity oil (VG100) provided the best contact conditions and wear results. Overall, reduced wear, even below the non-texturing case, was observed for sample 50–200 in VG100 lubrication, indicating the combined effect of oil reservoirs and increased oil-film thickness within the dimples due to the high viscosity.
Ključne besede: oil lubrication, surface modification, Ti-based alloy, tribology
Objavljeno v DiRROS: 01.02.2024; Ogledov: 130; Prenosov: 45
.pdf Celotno besedilo (4,00 MB)
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