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    Wyświetlanie 1-19 z 19
    Tytuł:
    Mechanical properties and microstructure of AlSi10Mg alloy obtained by casting and SLM technique
    Autorzy:
    Zyguła, Krystian
    Nosek, Bartłomiej
    Pasiowiec, Hubert
    Szysiak, Norbert
    Powiązania:
    https://bibliotekanauki.pl/articles/1177412.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    AlSi10Mg
    SLM - selective laser melting
    aluminium alloy
    heat treatment
    mechanical properties
    microstructure
    Opis:
    Selective laser melting (SLM) techniques are gaining popularity recently. Due to increasing requirements of the manufacturing industry regarding cost production reduction, methods based on additive manufacturing (AM) are more and more attractive. SLM method allows fabricating parts with minimum post-processing machining requirements. Considering the above, this technique is applied mainly in aviation, automotive industry and medicine. Manufacturing parts by SLM method demands strictly defined parameters in particular when using aluminium alloys, due to high risk of porosity. The aim of research was to evaluate the possibility of replacing traditional casting of small-lot details by novel SLM method in specified manufacturing conditions. This study contains comparison of chosen physical and mechanical properties of AlSi10Mg alloy obtained by SLM method and by casting. As-received as well as heat treated (T6 heat treatment) materials were examined. Both types of the billets were subjected to hardness, tensile and Charpy impact tests, before and after T6 heat treatment. For SLM material relative density was also specified. Microstructure of cast and SLM samples was analyzed using light microscopy. The results of the research lead to conclusion, that the key aspect is the appropriate selection of parameters of manufacturing of the parts by SLM method.
    Źródło:
    World Scientific News; 2018, 104; 456-466
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Residual Stresses of AlSi10Mg Fabricated by Selective Laser Melting (SLM)
    Autorzy:
    Karolus, M.
    Maszybrocka, J.
    Stwora, A.
    Skrabalak, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/351959.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AlSi10Mg alloy
    Selective Laser Melting
    SLM
    XRD
    residual stress–sin2ψ method
    texture
    Opis:
    The aim of the paper is the residual stress analysis of AlSi10Mg material fabricated by selective laser melting (SLM). The SLM technique allows to product of complex geometries based on three-dimensional model, in which stiffness and porosity can be precisely designed for specific uses. As the studied material, there were chosen solid samples built in two different directions: parallel (P-L) and perpendicular (P-R) to the tested surface and cellular lattice built in perpendicular direction, as well. In the paper, for the complex characterization of obtained materials, the phase analysis, residual stress and texture studies were performed. The classical non-destructive sin2ψ method was used to measure the residual stress measurements. The final products, both solid sample and cellular lattice, have a homogeneous phase composition and consist of solid solution Al(Si) (Fm-3m) type, Si (Fd-3m) and Mg2 Si (Pnma). The obtained values of the crystallite size are in a range of 1000 Å for Al(Si), 130-180 Å for Si phase. For Mg2 Si phase, the crystallite sizes depend on sintering process, they are 800 Å for solid samples and 107 Å for cellular lattice. The residual stress results have the compressive character and they are in a range from –5 to –15 MPa.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 1011-1016
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Failure Process of Maraging Steel Produced by Selective Laser Melting (SLM)
    Autorzy:
    Piekło, Jarosław
    Garbacz-Klempka, Aldona
    Powiązania:
    https://bibliotekanauki.pl/articles/2134112.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Selective Laser Melting
    maraging steel
    heat treatment
    metalography
    mechanical properties
    computer modelling
    Opis:
    An investigation of the failure process of maraging steel grade X3NiCoTi18-9-5 produced by the SLM method that is subjected to various three-dimensional stress-states has been carried out. In this paper, deformations and damage evolution are analysed experimentally and numerically. Three microstructures of the SLM steel were obtained after the appropriate heat treatment. Tensile tests of smooth specimens and axisymmetric notched specimens have been performed. Numerical models of the samples with ring notches were made in order to determine the stress state and displacement field in the notch area at the moment of the sample’s breakage as well as to compare the experimentally determined effective strain in the notch after the sample’s breakage with the deformation being calculated on the basis of the numerical solution. As a result of the research, it was found that the type of fracture of samples obtained from X3NiCoTi18-9-5 steel powder by the SLM method depends on the size of the ring notch’s radius. Based on the performed numerical calculations and experimental tests, it was found that, for each of the analysed variants of heat treatment, it was possible to indicate the approximate limit value of triaxiality factor Tf, above which there is a scrap of brittle X3NiCoTi18-9-5 steel produced by the SLM method. This value is determined by the characteristic bending of the function that determines the relationship between triaxiality factor Tf and effective strain eeff.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1107--1116
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of manufacturing method of the MAP21 magnesium alloy prepared by selective laser melting (SLM)
    Autorzy:
    Gruber, Konrad
    Mackiewicz, Adrianna
    Stopyra, Wojciech
    Dziedzic, Robert
    Kurzynowski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/306572.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    SLM
    Elektron 21
    mikrostruktura
    parametry procesowe
    MAP21
    microstructure
    processing parameters
    Opis:
    Magnesium alloys are well known for their biocompatibility and biodegradable properties [9], [27] owing to the fact that magnesium is a mineral crucial for human body, especially for bone tissue. There are studies [17] on using WE43 additively manufactured magnesium scaffolds for full bone and soft tissue regeneration. Moreover, magnesium implants in bones were investigated as having higher bone-implant interface strength than titanium ones [3]. In this paper, the results of the studies on MAP21 magnesium powder selective laser melting process optimization as a starting point for further bioapplications are presented. MAP21 magnesium alloy owing to its high mechanical properties, excellent vibration damping characteristic and good creep resistance is a promising material to be tested for scaffold structures. The study for the first time shows successful SLM manufacturing of dense samples made of MAP21 alloy. Using an algorithm based on design of experiment (DoE) method [21], the SLM process parameters were designated. The porosity was investigated as a SLM process optimization parameter. High density of produced sample, up to 99%, was achieved. Microstructure and oxidation level after selective laser melting (SLM) manufacturing were characterized. Fine grain microstructure and three kinds of precipitations were found Nd (Gd, Zr, Mg), Mg (Nd, Gd, Zr) and Mg (Zr, Nd, Gd, Zn)). In order to determine the mechanical properties of MAP21 alloy processed with SLM technology, static tensile tests and microhardness tests were conducted, resulting in mechanical properties (Rm = 167 MPa, E = 38.6 GPa, 63–74 HB) comparable with as-cast alloy. A discussion was held on further research opportunities for biomedical use of SLM-ed MAP21 alloy.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 4; 157-168
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Verification of geometrical accuracy of selective laser melting (SLM) built model
    Sprawdzanie dokładności modelu wytworzonego metodą selektywnego topienia laserem
    Autorzy:
    Królikowski, M.
    Filipowicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/176182.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SLM
    selective laser melting
    accuracy
    generative manufacturing
    rapid manufacturing
    selektywne topienie laserem
    dokładność
    wytwarzanie przyrostowe
    szybkie wytwarzanie
    Opis:
    The article presents individual approach discussion and results of measurements of accuracy of parts built using Selective Laser Melting (SLM) of metal powder. One of the reasons of research was checking the influence of distance from centre of base plate, as well as caused by this phenomena spot deviation on model accuracy. Deformation and deviations of geometry of thin walls was observed and reported. The aim of measurements was to find real accuracy of SLM generated thin walls in order to enable the further research on usage of this technology for production of thin wall elements and micro lattice constructions. Observed phenomena are discussed and used to prepare technological limitations of SLM manufacturing of thin-wall lattice structures.
    W pracy podjęto próbę określenia stopnia dokładności modelu wykonanego metodą selektywnego topienia laserem (SLM) proszku stali nierdzewnej. Ustalono wpływ odległości wiązki od środka płaszczyzny roboczej i wywołanego tym zjawiska zniekształcania wiązki na dokładność wytworzenia modelu. Stwierdzono jednocześnie odkształcenie elementów cienkościennych. Określono rzeczywistą dokładność odtworzenia elementów cienkościennych metodą SLM. Prowadzono analizę uzyskanych wyników w celu zastosowania tej technologii do wytwarzania elementów cienkościennych i konstrukcji mikrokratownicowych. Przedstawiono charakterystykę występujących zjawisk dla ustalenia ograniczeń technologicznych w wytwarzaniu konstrukcji mikrokratownicowych i cienkościennych.
    Źródło:
    Advances in Manufacturing Science and Technology; 2013, 37, 3; 85-91
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of Selective Laser Melting (SLM) as a Replacement for Pressure Die Casting Technology for the Production of Automotive Casting
    Autorzy:
    Piekło, J.
    Garbacz-Klempka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837724.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    additive manufacturing
    selective laser melting
    automotive casting
    mechanical properties
    microstructure
    produkcja dodatkowa
    selektywne topienie laserowe
    odlewy samochodowe
    właściwości mechaniczne
    mikrostruktura
    Opis:
    Selective laser melting is one of the additive manufacturing technologies that is used to produce complex-shaped components for applications in the automotive industry. The purpose of the changes in the design, technology, and material tests was to make a steering gear housing using the SLM method. The steering gear housing was produced by the pressure casting method using an AlSi9Cu3(Fe) alloy. The construction of this housing is adapted to the specifics of left-hand traffic. The change in technology was related to the change of the position of the steering system from right-hand to left-hand and the demand for a limited number of gear housings. It was necessary to make a virtual model of the housing on the basis of the part that was removed from the vehicle. In SLM technology, the AlSi10Mg aluminum alloy was used as a raw material in the form of CL 32Al gas-atomized powder. After the SLM process was completed, the housings were subjected to heat treatment. The AlSi10Mg alloy fabricated by the SLM method after heat treatment is characterized by good plasticity and an average value of tensile strength. The last stage was to check the geometry of the SLM housing with a 3D scanner. As a result, a map of the dimensional deviations from the nominal values was obtained. This data was used to modify the CAD model before the next fabrication process. The use of 3D printing technology allowed for the quick production of elements. The time to develop the technology and the production of the first two gear housings based on a 3D model was seven days.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 2; 9-16
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic Behaviour of Selective Laser Melted 316L Steel : Mechanical Properties and Microstructure Changes
    Dynamiczne zachowanie próbek ze stali 316L wytworzonych za pomocą metody SLM : właściwości mechaniczne i zmiany mikrostruktury
    Autorzy:
    Białobrzewski, Paweł
    Sienkiewicz, Judyta
    Janiszewski, Jacek
    Kluczyński, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/27314959.pdf
    Data publikacji:
    2023
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    microstructure
    stainless steel
    selective laser melting
    additive manufacturing
    split Hopkinson pressure bar
    mikrostruktura
    metoda addytowa
    SLM
    stal nierdzewna
    test dzielonego pręta Hopkinsona
    Opis:
    316L steel specimens with three different shear zones made by SLM (Selective Laser Melting) were subjected to dynamic tests using the Split Hopkinson Pressure Bar method. The effect of high-speed deformation on changes in microstructure was analyzed. In addition, the stress-strain relationship was determined from the SHPB results. To visualize the deformation process of the specimens during the tests, a camera with a high frame rate was used. It was shown that as the plastic deformation increases, the hardness of the material increases. Microstructural analysis of dynamically loaded areas revealed numerous defects. Twinning was found to be the main deformation mechanism. Large plastic deformation and many other microstructural changes such as shear bands, cracks and martensite nucleation were also observed.
    Próbki ze stali 316L z trzema różnymi strefami ścinania wykonane metodą SLM (Selective Laser Melting) poddano testom dynamicznym wykorzystując do tego metodę dzielonego pręta Hopkinsona (Split Hopkinson Pressure Bar). Przeanalizowano wpływ odkształceń o dużej szybkości na zmiany w mikrostrukturze. Ponadto na podstawie wyników badań SHPB wyznaczono zależność naprężenie- odkształcenie. W celu zobrazowania procesu odkształcania próbek podczas badań zastosowano kamerę o dużej częstości klatkowania. Wykazano, że wraz ze wzrostem odkształcenia plastycznego wzrasta twardość materiału. Analiza mikrostrukturalna obszarów obciążonych dynamicznie ujawniła liczne defekty. Stwierdzono, że głównym mechanizmem deformacji jest bliźniakowanie. Zaobserwowano również duże odkształcenia plastyczne i wiele innych zmian mikrostruktury, takich jak pasma ścinania, pęknięcia i zarodkowanie martenzytu.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2023, 14, 2(52); 51--72
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Vacuum Sintered and Selective Laser Melted Steel AISI 316L
    Autorzy:
    Brytan, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/351485.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    austenitic stainless steel
    316L
    selective laser melting
    SLM
    Opis:
    The paper presents the results of the basic mechanical properties determined in the static tensile test, impact un-notched Charpy test and hardness of austenitic stainless steel type 316L produced by two techniques: classical pressing and sintering in a vacuum with rapid cooling and selective laser melting (SLM). In this work fracture surface of Charpy test, samples were studied. The results indicate that application of selective laser melting (SLM) makes it possible to double increase the strength properties of components manufactured from austenitic stainless steel type 316L compared to sintering in a vacuum. Resulted in mechanical properties strongly depend on porosity characteristic and the presence of superficial oxides in the case of sintered steel and the character of observed microstructural defects deriving from non-fully melted powder particles and the formation of voids between subsequently melted pool tracks during the SLM.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2125-2131
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prototype of innovating bone tissue preserving THRA endoprosthesis with multi-spiked connecting scaffold manufactured in selective laser melting technology
    Autorzy:
    Uklejewski, R.
    Rogala, P.
    Winiecki, M.
    Mielniczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/284792.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    tkanka kostna
    endoproteza THRA
    SLM
    bone tissue
    THRA endoprosthesis
    selective laser melting
    Opis:
    The paper presents the prototype of innovating bone tissue preserving THRA endoprosthesis with multi-spiked connecting scaffold - the main result of our research project: "Experimental investigation and design of the constructional properties of bone-porous implants fixations" (4T07C05629, Polish Ministry of Science, finished in February 2008) presented also as plenary lecture at the 18th International Conference "Biomaterials in Medicine and Veterinary Medicine" in Rytro (Poland), 2008. Three-dimensional selective laser melting (SLM), a direct metal manufacturing (DMM) technology from rapid prototyping/rapid manufacturing (PR/RM) group, was successfully applied to manufacture these prototypes of Ti6AI7Nb powder. We share our observations and remarks on the prototypes manufacturing in SLM laser additive technology.
    Źródło:
    Engineering of Biomaterials; 2009, 12, 87; 2-6
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of post-process operations on the mechanical properties of titanium alloy Ti-6Al-7Nb, produced by selective laser melting
    Autorzy:
    Karoluk, M.
    Chlebus, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1190025.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    selektywne spiekanie laserowe
    SLM
    stop tytanu
    Ti-6Al-7Nb
    selective laser melting
    post-process operations
    titanium alloy
    Opis:
    Even though selective laser melting (SLM) has been available for more than a decade, during few last years the interest in this technology has grown extremely. SLM technology allows to fabricate fully functional and complex metal objects, layer by layer, via selective melting of material using laser beam. However, producing object by melting thin layers of material causes conditions of fast heat removal. This phenomenon leads to equilibrium microstructures, accompanied by the residual stresses which cause the decrease of mechanical properties. The following paper presents the result of research in the field of the influence of the post-process operations, such as machining and heat treatment, on the mechanical properties of alloy Ti-6Al-7Nb build by SLM.
    Źródło:
    Interdisciplinary Journal of Engineering Sciences; 2015, 3, 1; 16--19
    2300-5874
    Pojawia się w:
    Interdisciplinary Journal of Engineering Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Post-Heat Treatment on the Wear Properties of AlSi10Mg Alloy Manufactured by Selective Laser Melting
    Autorzy:
    Park, Tae-Hyun
    Baek, Min-Seok
    Sohn, Yongho
    Lee, Kee-Ahn
    Powiązania:
    https://bibliotekanauki.pl/articles/352450.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    selective laser melting
    SLM
    AlSi10Mg
    heat treatment
    microstructure
    wear
    Opis:
    Microstructure and wear property of AlSi10Mg alloy manufactured by selective laser melting (SLM) were investigated. Also, the effect of post heat treatment on the mechanical and wear properties was examined. Two kinds of heat treatments (direct aging (DA) and T6) were separately conducted to SLM AlSi10Mg alloy. As-built alloy had a cellular structure formed inside the moltenpool. Eutectic Si was also observed at the cellular boundary in as-built alloy. After DA heat treatment, the cellular structure still remained, and a large amount of nano-size Si particles were newly formed inside the cell structure. Both molten pool and cellular structure disappeared, and the size of Si increased in T6 alloy. The values of Vickers hardness measured as 139.4 HV (DA alloy), 128.0 HV (As-built alloy) and 85.1 HV (T6 alloy), respectively. However, concerning to wear property, T6 alloy showed better wear resistance than other alloys. The correlation between microstructure and wear mechanism of SLM AlSi10Mg alloy was also discussed.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1073-1080
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The ability of S.aureus to form biofilm on the Ti-6Al-7Nb scaffolds produced by Selective Laser Melting and subjected to the different types of surface modifications
    Autorzy:
    Szymczyk, P.
    Junka, A.
    Ziółkowski, G.
    Smutnicka, D.
    Bartoszewicz, M.
    Chlebus, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/306293.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    SLM
    micro-CT
    scaffolds
    Ti-6Al-7Nb alloy
    orthopedics
    S.aureus
    ortopedia
    Opis:
    The Gram-positive coccus, Staphylococcus aureus, is the leading etiologic agent of limb and life-threatening biofilm-related infections in the patients following the orthopaedic implantations. The aim of the present paper is to estimate the ability of S. aureus to form biofilm on titanium alloy (Ti-6Al-7Nb) scaffolds produced by Selective Laser Melting (SLM) and subjected to the different types of surface modifications, including ultrasonic cleaning and chemical polishing. The results obtained indicate significantly the decreased ability of S.aureus to form biofilm on the surface of scaffolds subjected to the chemical polishing in comparison to the scaffolds cleaned ultrasonically. The data provided can be useful for future applications of the SLM technology in production of Ti-6Al-7Nb medical implants.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 1; 69-76
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface quality research for selective laser melting of Ti-6Al-4V alloy
    Autorzy:
    Król, M.
    Tański, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/351176.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    additive manufacturing
    SLM process
    surface quality
    roughness
    Opis:
    One of the innovative technology of producing the components is Selective Laser Melting (SLM) belongs to additive manufacturing techniques. SLM technology has already been successfully applied in the automotive, aerospace and medical industries. Despite progress in material flexibility and mechanical performances, relatively poor surface finish still presents a significant weakness in the SLM process. The scope of the present article is the study the influence of selective laser melting parameters such as laser power, scanning speed, exposure time and hatch spacing through additive manufacturing as well as the orientation of the model corresponding to the laser beam on the surface characteristic of the components made from Ti-6A1-4V alloy. By using optimized process parameters, a low surface roughness can be obtained. In research, the machine for the selective laser melting of metal powders Renishaw AM 125 device was used. Based on experiment plan, 32 models were produced, which were examined to define the surface roughness and thus represent an influence of process parameters and the orientation on the model surface quality. The article discusses the fundamental factors determining the roughness that gives invaluable knowledge to improve the surface quality of SLM parts.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1291-1296
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Operating Window in Selective Laser Melting Processes
    Autorzy:
    Kozak, Jerzy
    Zakrzewski, Tomasz
    Witt, Marta
    Dębowska-Wąsak, Martyna
    Powiązania:
    https://bibliotekanauki.pl/articles/36833418.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    selective laser melting
    SLM
    thermal limitation
    mathematical modeling
    simulation
    Opis:
    Selective laser melting (SLM) is one of the most effective methods of additive manufacturing (AM). It is used to manufacture products with very complex geometries using a wide range of materials. Practical process conditions are limited by the occurrence of undesirable melting instabilities that degrade the surface quality and lead to product defects. These disadvantages are related to the thermal limitations of the SLM process. The lower thermal limit is due to the need to completely melt the powder layer and partially remelt the underlying layer again to ensure proper bonding between the layers. Exceeding the upper thermal limit in the molten metal pool may cause extensive evaporation, boiling and ejection of molten metal droplets outside the melting area. The article presents an approach and methodology that enable the determination of thermal limits and the operating window of SLM/selective laser sintering (SLS) processes in a relatively simple way. The studies have been performed using various settings of SLM process parameters. The usefulness of the preliminary determination of thermal limitations and approximate prediction of operating window of SLM has been confirmed experimentally and by more accurate computer simulation.
    Źródło:
    Transactions on Aerospace Research; 2023, 4 (273); 18-32
    0509-6669
    2545-2835
    Pojawia się w:
    Transactions on Aerospace Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Dental Prostheses Cast and Sintered by SLM from Co-Cr-Mo-W Alloy
    Autorzy:
    Myszka, D.
    Skrodzki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380544.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microstructure
    dental prosthesis
    precision investment casting
    selective laser melting
    dimensional accuracy
    proteza zębowa
    odlewnictwo precyzyjne
    przetapianie laserowe selektywne
    dokładność wymiarowa
    Opis:
    The article presents the results of a comparative analysis of the metal substructure for dental prosthesis made from a Co-Cr-Mo-W alloy by two techniques, i.e. precision investment casting and selective laser melting (SLM). It was found that the roughness of the raw surface of the SLM sinter is higher than the roughness of the cast surface, which is compensated by the process of blast cleaning during metal preparation for the application of a layer of porcelain. Castings have a dendritic structure, while SLM sinters are characterized by a compact, fine-grain microstructure of the hardness higher by about 100 HV units. High performance and high costs of implementation the SLM technology are the cause to use it for the purpose of many dental manufacturers under outsourcing rules. The result is a reduction in manufacturing costs of the product associated with dental work time necessary to scan, designing and treatment of sinter compared with the time needed to develop a substructure in wax, absorption in the refractory mass, casting, sand blasting and finishing. As a result of market competition and low cost of materials, sinter costs decrease which brings the total costs related to the construction unit making using the traditional method of casting, at far less commitment of time and greater predictability and consistent sinter quality.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 201-207
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technological restrictions of lightweight lattice structures manufactured by selective laser melting of metals
    Ograniczenia technologiczne w wytwarzaniu konstrukcji ultralekkich metodą selektywnego stapiania laserowego metali
    Autorzy:
    Królikowski, M.
    Grzesiak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/175662.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SLM
    rapid manufacturing
    selective laser melting
    lightweight lattice structures
    szybkie wytwarzanie
    selektywne topienie laserem
    ażurowe konstrukcje ultralekkie
    Opis:
    Selective Laser Melting technique is one of the additive manufacturing methods. The paper presents the summary of technological problems and restrictions resulting in the production of lightweight lattice structures by this technique. All the cases applies to the device SLM Realizer II 250 running the software Controler for Realizer SLM/STL.
    Selektywne topienie metali wiązką lasera należy do metod obróbki przyrostowej. W pracy przedstawiono analizę problemów technologicznych oraz ograniczenia w procesie wytwarzania metodą selektywnego topienia lekkich konstrukcji ażurowych. Badania doświadczalne prowadzono za pomocą urządzenia SLM Realizer II 250. Stosowano oprogramowanie sterujące Controler for Realizer SLM/STL.
    Źródło:
    Advances in Manufacturing Science and Technology; 2014, 38, 2; 75-82
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena zdolności tworzenia biofilmu P. Aeruginosa na próbkach stopu AZ31 uzyskanego w technologii SLM
    Ability of clinical P. Aeruginosa strains to form biofilm on the SLM-produced AZ31 specimens
    Autorzy:
    Pawlak, A.
    Szymczyk, P.
    Chlebus, E.
    Junka, A.
    Secewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/99015.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    selective laser melting
    AZ31
    P.aeruginosa
    technologie przyrostowe
    Opis:
    W pracy przedstawiono wyniki badań nad oceną zdolności tworzenia biofilmu szczepu bakterii P. Aeruginosa, na powierzchni próbek wyprodukowanych z lekkiego stopu magnezu - AZ31 w technologii SLM. Ilość kolonii bakteryjnych wyhodowanych w biofilnie, jest nawet 700x wyższa, w odniesieniu do skafoldów ze stopu Ti-6Al-7Nb, wyprodukowanych w tej samej technologii.
    In this work, results of research on ability to form biofilm by P. Aeruginosa strains on AZ31 specimens manufactured in SLM technology are reported. The number of cells forming biofilm on specimens is even 700 times higher than on scaffolds manufactured from Ti-6Al-7Nb alloy by SLM technique.
    Źródło:
    Aktualne Problemy Biomechaniki; 2015, 9; 89-92
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New lumbar disc endoprosthesis applied to the patient’s anatomic features
    Autorzy:
    Mróz, A.
    Skalski, K.
    Walczyk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/307179.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    analiza MES
    obrazowanie medyczne
    SLM
    badania tarciowo-zużyciowe
    finite element analysis
    medical imaging
    total disc replacement
    selective laser melting
    friction and wear tests
    Opis:
    Purpose: The paper describes the process of designing, manufacturing and design verification of the intervertebral of a new structure of lumbar disc endoprosthesis – INOP/LSP.1101. Methods: Modern and noninvasive medical imagining techniques, make it possible to record results of tests in a digital form, which creates opportunities for further processing. Mimics Innovation Suite software generates three-dimensional virtual models reflecting the real shape and measurements of components of L4-L5 spinal motion segment. With the use of 3D Print technique, physical models of bone structures of the mobile segment of the spine as well as the INOP/LSP.1101 endoprosthesis model were generated. A simplified FEA analysis of stresses in the endoprosthesis was performed to evaluate the designed geometries and materials of the new structure. Results: The endoprosthesis prototype was made of Co28Cr6Mo alloy with the use of selective laser technology. The prototypes were subject to tribological verification with the use of the SBT-03.1 spine simulator. Conclusions: The structure of the endoprosthesis ensures a full reflection of its kinematics, full range of mobility of the motion segment in all anatomical planes as well as restoration of a normal height of the intervertebral space and curvature of the lordosis. The results of the tribological tests confirmed that SLM technology has the potential for production of the human bone and jointendoprostheses.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 2; 25-34
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The chemical digestion of Ti6Al7Nb scaffolds produced by Selective Laser Melting reduces significantly ability of Pseudomonas aeruginosa to form biofilm
    Autorzy:
    Junka, A. F.
    Szymczyk, P.
    Secewicz, A.
    Pawlak, A.
    Smutnicka, D.
    Ziółkowski, G.
    Bartoszewicz, M.
    Chlebus, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/307092.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    technologia SLM
    Pseudomonas aeruginosa
    skafoldy
    modyfikacja powierzchni
    Ti-6Al-7Nb
    SLM technology
    scaffolds
    surface modification
    Opis:
    In our previous work we reported the impact of hydrofluoric and nitric acid used for chemical polishing of Ti-6Al-7Nb scaffolds on decrease of the number of Staphylococcus aureus biofilm forming cells. Herein, we tested impact of the aforementioned substances on biofilm of Gram-negative microorganism, Pseudomonas aeruginosa, dangerous pathogen responsible for plethora of implant-related infections. The Ti-6Al-7Nb scaffolds were manufactured using Selective Laser Melting method. Scaffolds were subjected to chemical polishing using a mixture of nitric acid and fluoride or left intact (control group). Pseudomonal biofilm was allowed to form on scaffolds for 24 hours and was removed by mechanical vortex shaking. The number of pseudomonal cells was estimated by means of quantitative culture and Scanning Electron Microscopy. The presence of nitric acid and fluoride on scaffold surfaces was assessed by means of IR and rentgen spetorscopy. Quantitative data were analysed using the Mann–Whitney test (P ≤ 0.05). Our results indicate that application of chemical polishing correlates with significant drop of biofilm-forming pseudomonal cells on the manufactured Ti-6Al-7Nb scaffolds ( p = 0.0133, Mann–Whitney test) compared to the number of biofilm-forming cells on non-polished scaffolds. As X-ray photoelectron spectroscopy revealed the presence of fluoride and nitrogen on the surface of scaffold, we speculate that drop of biofilm forming cells may be caused by biofilm-supressing activity of these two elements.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 1; 115-120
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-19 z 19

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