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Iskalni niz: "vrsta gradiva" (1) AND "polno besedilo" AND "organizacija" (Inštitut za kovinske materiale in tehnologije) .

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Influence of isothermal annealing in the 600 to 750 °C range on the degradation of SAF 2205 duplex stainless steel
Jaka Burja, Borut Žužek, Barbara Šetina, 2024, izvirni znanstveni članek

Povzetek: We studied the effect of isothermal annealing (600–750 °C, 1 to 1000 min) on the microstructure and mechanical properties of SAF 2205 duplex stainless steel. Impact toughness was found to be significantly more affected than hardness by annealing. Annealing at 750 °C for 1000 min resulted in a more than 90% decrease in impact toughness, while hardness only increased by 25%. Tensile strength increased up to 100 MPa, but elongation decreased by more than 50% under the same conditions. Sigma phase formation was minimal at lower temperatures (650 °C and below) but increased significantly at higher temperatures. At 750 °C and 1000 min of annealing, the ferrite content dropped from 50% to 16%. These findings suggest that annealing temperature and time need to be carefully controlled to avoid a reduction in impact toughness and ductility caused by sigma phase precipitation. The harmful effect of sigma phase precipitation on mechanical properties was directly shown.
Ključne besede: duplex stainless steel, sigma phase, precipitation kinetics, mechanical properties, isothermal annealing
Objavljeno v DiRROS: 24.07.2024; Ogledov: 3; Prenosov: 1
.pdf Celotno besedilo (20,91 MB)
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Harmonizing microstructures and enhancing mechanical resilience : novel powder metallurgy approach for Zn–Mg alloys
Anna Boukalová, Jiří Kubásek, David Nečas, Peter Minárik, Črtomir Donik, Drahomír Dvorský, Dalibor Vojtěch, Alena Michalcová, Matjaž Godec, Irena Paulin, 2024, izvirni znanstveni članek

Povzetek: Zinc alloys are recognised for their excellent biocompatibility and favourable corrosion rates, making them suitable for bioabsorbable implants. However, their mechanical properties necessitate improvement to fulfil the rigorous requirements of biomedical applications. This research focuses on engineering pseudo-harmonic structures within zinc alloys through a comprehensive method combining mechanical alloying, spark plasma sintering, and hot extrusion techniques. This fabrication process results in a composite material characterised by a soft core surrounded by a continuous, three-dimensional, ultrafine-grained hard shell. The experiment involved blending pure zinc with Zn–1Mg alloy powder, leading to the formation of both ductile zinc and fine-grained Zn–1Mg regions. While the Mg2Zn11 intermetallic phase was found to enhance the alloy's mechanical strength, the presence of oxide shells adversely affected the material's properties. The elimination of these shells via hot extrusion markedly improved the alloy's tensile strength, reaching an average value of tensile strength of 333 ± 7 MPa. This study provides significant insights into the material engineering of zinc-based alloys for biodegradable implant applications, demonstrating a viable approach to optimising their mechanical performance.
Ključne besede: zinc, magnesium, biodegradable, powder metallurgy, harmonic structure
Objavljeno v DiRROS: 23.07.2024; Ogledov: 23; Prenosov: 9
.pdf Celotno besedilo (14,29 MB)
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Exploring the microstructure, mechanical properties, and corrosion resistance of innovative bioabsorbable Zn-Mg-(Si) alloys fabricated via powder metallurgy techniques
David Nečas, Vojtěch Hybášek, Jan Pinc, Andrea Školáková, Ilona Voňavková, Klára Hosová, Martin Zlámal, Anna Boukalová, Jan Pokorný, Drahomír Dvorský, Črtomir Donik, Dalibor Vojtěch, Jiří Kubásek, 2024, izvirni znanstveni članek

Povzetek: Zinc alloys belong to the widely studied materials for applications like medical devices, however, they often encounter an inappropriate combination of mechanical/corrosion/biological properties. In this respect, we produced the Zn–1Mg and Zn–1Mg–1Si containing biologically friendly elements with potential strengthening effects on zinc matrix by powder metallurgy methods including mechanical alloying, spark plasma sintering, and extrusion further enabling the formation of materials with unique extremely fine-grained microstructures. The systematic study of these materials showed the possibility of reaching homogeneous nano-grain microstructure and high strength values exceeding 450 MPa in tension. Selected chemical composition and processing methods led also to slightly decreased wear and corrosion rates and rather uniform corrosion.
Ključne besede: zinc, mechanical alloying, biodegradable metals, composite, spark plasma sintering, extrusion, powder metallurgy
Objavljeno v DiRROS: 23.07.2024; Ogledov: 21; Prenosov: 6
.pdf Celotno besedilo (21,50 MB)
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Characterization of micro-threaded stem taper surface of cementless hip endoprostheses
Drago Dolinar, Boštjan Kocjančič, Klemen Avsec, Barbara Šetina, Aleksandra Kocijan, Matjaž Godec, Marko Sedlaček, Mojca Debeljak, John T. Grant, Timon Zupanc, Monika Jenko, 2024, izvirni znanstveni članek

Povzetek: We investigated micro-threaded stem taper surface and its impact on premature failures, aseptic loosening, and infection in cementless hip endoprostheses. Our study focused on the fretting, and crevice corrosion of micro-threaded tapers, as well as the characterization of the microstructure and surface properties of two new and three retrieved Zweymüller stem tapers. The retrieved samples were selected and examined based on the head–stem taper interface being the sole source of modularity with a metallic component, specifically between the Ti alloy taper stem and the ceramic head. To determine the surface chemistry and microstructures of both new and retrieved hip endoprostheses stem taper titanium alloy, scanning -electron microscopy (SEM) was employed for morphological and microstructural analyses. Energy dispersive spectroscopy (EDS) was utilized for characterizing chemical element distribution, and electron backscattered diffraction (EBSD) was used for phase analysis. The roughness of the micro-threated stem tapers from different manufacturers was investigated using an optical profilometer, with standard roughness parameters Ra (average surface roughness) and Rz (mean peak to valley height of the roughness profile) being measured. Electrochemical studies revealed no fretting corrosion in retrieved stem tapers with ceramic heads. Consequently, three retrieved tapers and two new ones for comparison underwent potentiodynamic measurements in Hank’s solution to determine the corrosion rate of new and retrieved stem taper surfaces. The results showed a low corrosion rate for both new and prematurely failed retrieved samples due to aseptic loosening. However, the corrosion rate was higher in infected and low-grade infected tapers. In conclusion, our study suggests that using ceramic heads reduces taper corrosion and subsequently decreases the incidence of premature failures in total hip arthroplasty.
Ključne besede: total hip arthroplasty, stem micro-threaded taper, taper surface morphology, microstructure, corrosion, Ti implant alloy
Objavljeno v DiRROS: 06.06.2024; Ogledov: 166; Prenosov: 139
.pdf Celotno besedilo (8,47 MB)
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In vitro degradation behaviour of biodegradable magnesium alloys
Julia Nachtsheim, Jaka Burja, Songyun Ma, Bernd A. Markert, 2023, objavljeni znanstveni prispevek na konferenci

Ključne besede: biodegradable magnesium alloy, in vitro corrosion behaviour
Objavljeno v DiRROS: 20.05.2024; Ogledov: 196; Prenosov: 537
.pdf Celotno besedilo (1,73 MB)
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Influence of casting defects on damage evolution and potential failures in hot rolling simulation system
Umut Hanoglu, Božidar Šarler, 2023, izvirni znanstveni članek

Ključne besede: simulation, rolling, steel, slice model, meshless, radial basis functions, damage
Objavljeno v DiRROS: 18.04.2024; Ogledov: 252; Prenosov: 132
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Corrosion behaviour of additively manufactured metallic materials
Aleksandra Kocijan, 2024, pregledni znanstveni članek

Ključne besede: additive manufacturing, corrosion, steel, Inconel 625, FeMn alloy
Objavljeno v DiRROS: 09.04.2024; Ogledov: 395; Prenosov: 152
.pdf Celotno besedilo (579,23 KB)
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The comparison of conventional and additive manufacturing technologies for manufacturing of Ti6Al4V structures in the aerospace industry
Marjetka Conradi, 2023, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje)

Objavljeno v DiRROS: 04.04.2024; Ogledov: 251; Prenosov: 104
.pdf Celotno besedilo (71,68 KB)
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