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Wyświetlanie 1-15 z 38
Tytuł:
Selective laser trabeculoplasty for open angle glaucoma
Autorzy:
Liput, Joanna
Tan, Weijen
Powiązania:
https://bibliotekanauki.pl/articles/1928202.pdf
Data publikacji:
2017
Wydawca:
Medical Education
Tematy:
efficacy
primary open glaucoma
safety
selective laser trabeculoplasty
Opis:
Selective laser trabeculoplasty (SLT) is an important treatment option in open angle glaucoma. It has been shown to be as effective as argon laser trabeculoplasty in primary open angle glaucoma while having an improved safety profile. Its use is also indicated for other subtypes of open angle glaucoma (OAG) such as pseudoexfoliation (PXE) and pigmentary glaucoma. In this review, we present the current literature on the role of SLT in treating OAG. The indications, duration of effect, repeatability, cost effectiveness and clinical effectiveness of SLT were reviewed. Available evidence comparing SLT with ALT and medical treatment are also presented. We also discuss the applicability of SLT for PXE, pigmentary glaucoma, normal tension glaucoma and advanced OAG. Lastly, the complications of SLT and areas of further research are discussed.
Źródło:
OphthaTherapy; 2017, 4, 4; 199-209
2353-7175
2543-9987
Pojawia się w:
OphthaTherapy
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:
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:
Additive Manufacturing of WC-Co by Indirect Selective Laser Sintering (SLS) using High Bulk Density Powders
Autorzy:
Gădălean, Rares Vasile
Jucan, Ovidiu-Darius
Chicinaş, Horea
Bâlc, Nicolae
Popa, Catalin O.
Powiązania:
https://bibliotekanauki.pl/articles/2106562.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
additive manufacturing
selective laser sintering
cemented carbide
polyamide 12
Opis:
Research in additive manufacturing of tungsten carbide-cobalt has intensified over the last few years due to the increasing need for products designed using topology optimisation and multiscale structures (lattice). These products result in complex shapes and contain inner structures that are challenging to produce through conventional techniques, thus involving high costs. The present work addresses this problem using a two-step approach to 3D print parts with complex shapes and internal structures by employing indirect selective laser sintering (SLS) and tungsten carbide-cobalt sintering. The paper takes further our research in this field [1] to improve the part density by using high bulk density tungsten carbide-cobalt powders. Mechanically mixing tungsten carbide-cobalt with the sacrificial binder, polyamide 12, results in a homogenous powder successfully used by the selective laser sintering process to produce green parts. By further processing, the green parts through a complete sintering cycle, an average final part density of 11.72 g/cm3 representing more than 80% of the theoretical density is achieved.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 577--585
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
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:
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:
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:
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:
Effect of Heat Treatment on Microstructure and Impact Toughness of Ti-6Al-4V Manufactured by Selective Laser Melting Process
Autorzy:
Lee, K.-A.
Kim, Y.-K.
Yu, J.-H.
Park, S.-H.
Kim, M.-C.
Powiązania:
https://bibliotekanauki.pl/articles/354570.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
selective laser melting
Ti-6Al-4V
microstructure
impact toughness
heat treatment
Opis:
This study manufactured Ti-6Al-4V alloy using one of the powder bed fusion 3D-printing processes, selective laser melting, and investigated the effect of heat treatment (650°C/3hrs) on microstructure and impact toughness of the material. Initial microstructural observation identified prior-β grain along the building direction before and after heat treatment. In addition, the material formed a fully martensite structure before heat treatment, and after heat treatment, α and β phase were formed simultaneously. Charpy impact tests were conducted. The average impact energy measured as 6.0 J before heat treatment, and after heat treatment, the average impact energy increased by approximately 20% to 7.3 J. Fracture surface observation after the impact test showed that both alloys had brittle characteristics on macro levels, but showed ductile fracture characteristics and dimples at micro levels.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1341-1346
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sintering and Microstructures of SUS 316L Powder Produced by 3D Printing Process
Autorzy:
Kim, W. J.
Nguyen, H.-H.
Kim, H. Y.
Nguyen, M.-T.
Park, H. S.
Kim, J.-C.
Powiązania:
https://bibliotekanauki.pl/articles/356018.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stainless steel
3D printing
selective laser sintering
SUS 316L
flake powder
Opis:
Selective laser sintering (SLS) is a type of laminating sintering technique, using CO2 laser with (metal, polymer, and ceramic) powders. In this result, the flake SUS 316L was used to achieve a high porous product, and compare to spherical type. After SLS, the porosity of flake-type sample with 34% was quite higher than that of the spherical-type one that had only 11%. The surface roughness of the flake SLS sample were also investigated in both inner and surface parts. The results show that the deviation of the roughness of the surface part is about 64.40μm, while that of the internal one was about 117.65μm, which presents the containing of high porosity in the uneven surfaces. With the process using spherical powder, the sample was quite dense, however, some initial particles still remained as a result of less energy received at the beneath of the processing layer.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1215-1218
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Temperature Oxidation Property of Ni Based Superalloy CM247LC Produced Via Selective Laser Melting Process
Autorzy:
Lee, Jung-Uk
Kim, Young-Kyun
Seo, Seong-Moon
Lee, Kee-Ahn
Powiązania:
https://bibliotekanauki.pl/articles/2203720.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ni-based superalloy
selective laser melting
directional solidification
microstructure
high temperature oxidation property
Opis:
CM247LC alloy was manufactured by using selective laser melting (SLM) process, one of the laser powder bed fusion (L-PBF) methods. The hot isostatic pressing (HIP) process was additionally conducted on the SLM-built CM247LC to control its microstructures and defects. The high temperature oxidation property was investigated, and it was compared with conventional DS247LC sample (reference) prepared via the directional solidification process. The L-PBF HIP sample showed blocky-type MC carbides generated along the grain boundary with average size of about 200 nm. A semi-spherical primary γ' phase of size 0.4-1.0 μm was also observed inside the grains. Moreover, the DS247LC sample displayed a coarse eutectic γ' phase and many script-type MC carbides. Furthermore, cuboidal-type γ' with an average size of about 0.5 μm was detected. High-temperature oxidation tests were conducted at 1000°C and 1100°C for 24 hours. The results at 1100°C oxidation temperature showed that the measured oxidation weight gains for HIP and DS247LC were 1.96 mg/cm2 and 2.26 mg/cm2, respectively, indicating the superior high-temperature oxidation resistance of the L-PBF HIP sample. Based on the above results, a high-temperature oxidation mechanism of the CM247LC alloys manufactured by the SLM process and the directional solidification process has been proposed.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 107--112
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling, manufacturability and compression properties of the CpTi grade 2 cellular lattice with radial gradient TPMS architecture
Autorzy:
Maszybrocka, J.
Gapiński, B.
Dworak, M.
Skrabalak, G.
Stwora, A.
Powiązania:
https://bibliotekanauki.pl/articles/201748.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
selective laser sintering
additive manufacturing
cellular lattice
triply periodic minimal surfaces
mechanical properties
Opis:
In the present study, a titanium cellular lattice structure with a mathematical designed porosity gradient was successfully fabricated using the selective laser melting method. The samples with smooth gradient transition of porosity of between 60% and 80% were received for different elementary cell geometries. Elementary cells belong to the triply periodic minimal surfaces family (G, D, I2Y, IWP). Each sample was subjected to a comprehensive analysis including: dimensional metrology and assessment of material defects (X-ray micro-tomography), surface morphology tests (scanning electron microscopy) and mechanical properties (universal testing machine). It has been shown that a cellular lattice with high dimensional accuracy (+ 0.16/– 0.08 mm) and full dense struts can be obtained. According to the assumption, the gradient increases the strength of the cellular lattice samples. The highest increase in plateau stress between the samples with and without gradient was found for the I2Y series (about 185%). Furthermore, it was found that the stress-strain response of the samples depends not only on total porosity, but also on the 3D geometry of the cellular lattice. The stress-strain curves for G, IWP and I2Y samples are smooth and exhibit three characteristic regions: linear elasticity, plateau region and densification region. The size of regions depends on the geometric features of the cellular lattice. For series D, in the plateau region, the fluctuations in stress value are clearly visible. The smoothest stress-strain curve can be noted for the G series, which combined with good mechanical properties (the plateau stress and energy absorbed, at respectively 25.5 and 43.2 MPa, and 46.3J and 59.5J for Gyr_80 and Gyr_6080, which corresponds to a strain of almost 65% and 50%) positively affects the applicability of cellular structures with such geometry.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 4; 719-727
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
An overview of selective laser sintering technologies
Przegląd technologii selektywnego spiekania laserowego
Autorzy:
Przestacki, D.
Sieniawski, J.
Stambolov, G.
Lisiak, P.
Powiązania:
https://bibliotekanauki.pl/articles/94134.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
selective laser sintering
scanning strategies
densification
shrinkage
selektywne spiekanie laserowe
strategie spiekania laserowego
zagęszczenie
skurcz
Opis:
This paper presents an overview of the selective laser sintering (SLS) process of various materials. The influence of distinct scanning patterns and SLS process input parameters (e.g.: scanning rate, laser power, hatching distance) on the sintered materials’ physical and technological properties was investigated. The classifications of SLS processes and scanning patterns were also presented. The literature survey revealed that sintered materials’ density, shrinkage and dimensional accuracy are significantly affected by the scanning strategy, as well as selection of hatching distance and line energy. The research results presented in this work can be also applied to the appropriate selection of the SLS process strategy, enabling the improvement of sintered materials’ physical and technological properties.
W pracy dokonano przeglądu literaturowego, dotyczącego technologii selektywnego spiekania laserowego. Zaprezentowano wyniki badań dotyczące wpływu strategii oraz parametrów wejściowych procesu (np.: prędkości wiązki lasera, mocy lasera, odległości pomiędzy ścieżkami wiązki) na właściwości fizyczne i technologiczne otrzymanych spieków. Dokonano również klasyfikacji procesów SLS i niezbędnych do ich realizacji strategii. Przegląd literatury ukazał, że gęstość, skurcz oraz dokładność geometryczna spieków w istotnym stopniu zależą od doboru strategii, odległości pomiędzy ścieżkami wiązki lasera i energii liniowej. Wyniki badań zaprezentowane w pracy mogą również stanowić punkt wyjścia do dalszych badań, dotyczących poprawy właściwości fizycznych i technologicznych wytwarzanych spieków.
Źródło:
Archives of Mechanical Technology and Materials; 2015, 35; 23-32
2450-9469
Pojawia się w:
Archives of Mechanical Technology and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dual Speed Laser Remelting for High Densification in H13 Tool Steel Metal 3D Printing
Autorzy:
Jung, Im Doo
Choe, Jungho
Yun, Jaecheol
Yang, Sangsun
Yang, Dong-Yeol
Kim, Yong-Jin
Yu, Ji-Hun
Powiązania:
https://bibliotekanauki.pl/articles/353737.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal 3d printing
powder bed fusion
selective laser melting
H13 tool steel
remelting
Opis:
The densification behavior of H13 tool steel powder by dual speed laser scanning strategy have been characterized for selective laser melting process, one of powder bed fusion based metal 3d printing. Under limited given laser power, the laser re-melting increases the relative density and hardness of H13 tool steel with closing pores. The single melt-pool analysis shows that the pores are located on top area of melt pool when the scanning speed is over 400 mm/s while the low scanning speed of 200 mm/s generates pores beneath the melt pool in the form of keyhole mode with the high energy input from the laser. With the second laser scanning, the pores on top area of melt pools are efficiently closed with proper dual combination of scan speed. However pores located beneath the melt pools could not be removed by second laser scanning. When each layer of 3d printing are re-melted, the relative density and hardness are improved for most dual combination of scanning. Among the scan speed combination, the 600 mm/s by 400 mm/s leads to the highest relative density, 99.94% with hardness of 53.5 HRC. This densification characterization with H13 tool steel laser re-melting can be efficiently applied for tool steel component manufacturing via metal 3d printing.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 571-578
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 38

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