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Tytuł:
Effects of Y2O3 on Microstructure and Corrosion Properties of Laser Cladding Composite Coatings on 304 Stainless Steel Substrate
Autorzy:
Yu, Jinling
Zhentai, Zheng
Li, Shuai
Guo, Donghui
Chang, Liang
Powiązania:
https://bibliotekanauki.pl/articles/27313865.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
laser cladding
Ni-based coatings
electrochemical corrosion
Opis:
Ni625/WC composite coatings added with different amounts of Y2O3 were prepared on the surface of 304 stainless steels by laser cladding. This study focused on the microstructure characteristics, microhardness, and corrosion performances of Ni625/WC composite coatings. The results showed that Y2O3 can effectively improve the corrosion resistance of the composite coatings. The microstructure from the bottom to the surface of composite coatings consists of plane crystal, cellular crystal, columnar crystal and equiaxed crystal. The Y2O3 content of optimum composite coating was 1.0%. Its microhardness was three times that of matrix material. In addition, the corrosion current density of the composite coating was only 2% of Ni625/WC coating, which was attributed to the good properties of Y2O3 and appropriate Y2O3 refined microstructure.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 447--453
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Improvement of Surface Properties of Low Carbon Steel Using Laser Cladding
Autorzy:
Kim, Cheol-Woo
Yoo, Hyo-Sang
Jeon, Jae-Yeol
Cho, Kyun-Taek
Choi, Se-Weon
Powiązania:
https://bibliotekanauki.pl/articles/2048888.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser cladding
vickers hardness
microstructure
surface treatment
Opis:
Laser cladding is a method that can be applied to repair the crack and break on the mold and die surfaces, as well as generate new attributes on the surface to improve toughness, hardness, and corrosion resistance. It is used to extend the life of the mold. It also has the advantages of superior bonding strength and precision coating on a local area compared with the conventional thermal spraying technology. In this study, we investigated the effect of cladding on low carbon alloy steel using 18%Cr-2.5%Ni-Fe powder (Rockit404), which showed high hardness on the die surface. The process conditions were performed in an argon atmosphere using a diode laser source specialized for 900-1070 nm, and the output conditions were 5, 6, and 10 kW, respectively. After the cladding was completed, the surface coating layer’s shape, the hardness according to the cross-section’s thickness, and the microstructure were analyzed.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 1033-1036
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Behaviour of the exhaust valve cladding face under the service conditions
Autorzy:
Kończewicz, W.
Smoleńska, H.
Powiązania:
https://bibliotekanauki.pl/articles/244130.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
exhaust valve
laser cladding
cobalt alloy
service wear
Opis:
During the ship engine operation one of the key problems is the exhaust valve durability. A special interest is in valve head face because this narrow part of the valve is responsible for tightness. Cobalt base laser cladding layer on the exhaust valve head face have been investigate under real service condition using the laboratory two-stroke diesel engine L22 for two years. During this time the engine was fuelling with both ordinary light fuel and biodiesel fuel. After removing from the valve head from the cylinder head the face surface were fully inspected optically. There were no damages and the surface was shining in the great deal however some dark "spots " on it. The samples made of the used valve head underwent microstructural investigation and hardness measurements. There were no observed substantial microstructural changes neither in the surface of the layer nor in the bulk of the clad. The decrease of the hardness numbers was observed but still clad layer presented higher hardness than steel base. This type ofclad layer underwent intensive laboratory examinations which contained oxidation experiments at different temperatures and corrosion in exhaust gases and with the present service experiment this method of valve head hard facing is suitable for practical applications.
Źródło:
Journal of KONES; 2009, 16, 1; 265-271
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Improvement of Surface Properties of SKD61 Powder on S45C Using Laser Cladding
Autorzy:
Kim, Cheol-Woo
Yoo, Hyo-Sang
Powiązania:
https://bibliotekanauki.pl/articles/2174572.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser cladding
Micro Vickers hardness
microstructure
polarization curve
Opis:
In this study, we investigated the effect of cladding on structural carbon steel (S45C) using 5%Cr-1.5%Mo-Fe powder (SKD61), which is expected to show economically efficient production of die-casting parts. The process conditions were performed under argon atmosphere using a diode laser source with specialized wavelength of 900-1070 nm, and the output conditions were 3, 4, and 5 kW, respectively. After the cladding was completed, the surface coating layer’s shape and the microstructure were analyzed. The hardness test was carried out with Micro Vickers hardness tester under 500 gram-force along the normal line at the interval of 0.2 mm from the surface to core direction on the cross-sectional area. In addition, polarization curve test of the surface coating layer was performed to investigate the corrosion resistance characteristics.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1465--1468
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on structures and properties of the laser cladding exhaust valve after service
Autorzy:
Kończewicz, W.
Krużycki, P.
Smoleńska, H.
Powiązania:
https://bibliotekanauki.pl/articles/244029.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
exhaust valve
laser cladding
cobalt alloy
service wear
Opis:
The cobalt base laser cladding layers which were built up on the exhaust valve head face of the heavy loaded marine diesel engine have been investigated. The valve head with cladded face were served successfully for 3000 hours in the engine of the Dar Młodzieży. After removing from the valve head from the cylinder head the face surface were fully inspected. The surface topography and roughness were evaluated. Microstructure on the cross section of the clad layer were analyzed using Scanning Electron Microscope (SEM) equipped with energy dispersive spectroscopy (EDS. Also microhardness of the clad layer was measured. The service conditions resulted with the formation of the scale which had different thickness and tended to cracking and spalling. The microstructure of the clad layers after service did not demonstrated serious degradation process. The decrease of the hardness numbers was observed but still clad layer presented higher hardness than steel base. This type of clad layer underwent intensive laboratory examinations which contained oxidation experiments at different temperatures and corrosion in exhaust gases, long time exposition in laboratory engine and in the end 3000 hours successfully service on the ship. After such experience laser cladding cobalt base layers may be recommended as a useful solutionfor both prolongs of the service life and a method of the regeneration of the slightly used valve heads is suitable for practical applications.
Źródło:
Journal of KONES; 2010, 17, 3; 211-216
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser Cladding of WC/T-800 Cermet: Fabrication, Microstructure and Wear Properties
Autorzy:
Kim, Kyoung-Wook
Kim, Young-Kyun
Park, Sun-Hong
Lee, Kee-Ahn
Powiązania:
https://bibliotekanauki.pl/articles/2049250.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CoMoCr alloy
WC
cermet
laser cladding
microstructure
wear properties
Opis:
This study fabricated a WC/T-800 cermet coating layer with Co-Mo-Cr (T-800) powder and WC powder using laser cladding, and analyzed its microstructure, hardness and wear properties. For comparison, casted bulk T-800 was used. Laser cladded WC/T-800 cermet coating layer showed circular WC phases in the Co matrix, and dendritic laves phases. The average laves phase size in the cermet coating layer and bulk T-800 measured as 7.9 µm and 60.6 µm, respectively, indicating that the cermet coating layer had a relatively finer laves phase. Upon conducting a wear test, the cermet coating layer added with WC showed better wear resistance. In the case of laser cladded WC/T-800 cermet coating layer, abrasion wear was observed; on the contrary, the bulk T-800 showed pulled out laves phases. Based on the above findings, the WC/T-800 cermet coating layer using laser cladding and the relationship between its microstructure and wear behavior were discussed.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 713-717
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Napawanie laserowe warstw kompozytowych na osnowie stopu Inconel 625
Laser cladding of Inconel 625-based composite coatings
Autorzy:
Janicki, D.
Górka, J.
Kotarska, A.
Powiązania:
https://bibliotekanauki.pl/articles/115093.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
napawanie laserowe
powłoka kompozytowa
Inconel 625
laser cladding
composite coating
Opis:
Artykuł prezentuje wyniki badań procesu napawania laserem diodowym warstw wierzchnich kompozytowych na osnowie stopu niklu Inconel 625 wzmacnianych cząstkami WC oraz Cr3C2. Określono wpływ energii linowej napawania oraz morfologii cząstek fazy umacniającej (FU) na stopień jej rozpuszczenia w osnowie warstwy. Ponadto, określono wpływ morfologii cząstek FU na odporność erozyjną warstw.
Inconel 625-based composite coatings reinforced by WC and Cr3C2 particles have been produced via a diode laser cladding process. The effect of heat input level and morphology of the reinforcing particles on the degree of their dissolution has been established. Additionally, the influence of the morphology of the reinforcing particles on the erosive wear behaviour of the coatings was studied.
Źródło:
Welding Technology Review; 2018, 90, 9; 6-12
0033-2364
2449-7959
Pojawia się w:
Welding Technology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid additive and subtractive manufacturing processes and systems: a review
Autorzy:
Grzesik, W.
Powiązania:
https://bibliotekanauki.pl/articles/99525.pdf
Data publikacji:
2018
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
hybrid manufacturing
CNC machining
additive machining
laser cladding
repair technology
Opis:
This review paper highlights the hybrid manufacturing processes which integrate the additive and subtractive processes performing on one hybrid platform consisting of the LMD (laser metal deposition) unit and CNC machine tools. In particular, some important rules and advantages as well as technological potentials of the integration of different AM technique and finishing CNC machining operations are discussed and overviewed. Some representative examples such as formation of difficult features around the part periphery, deposition of functional layers and coatings and repair of high-value parts in aerospace industry are provided. Some conclusions and future trends in the implementation of hybrid processes are outlined.
Źródło:
Journal of Machine Engineering; 2018, 18, 4; 5-24
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural and Mechanical Study of Inconel 625 - Tungsten Carbide Composite Coatings Obtained by Powder Laser Cladding
Autorzy:
Huebner, J.
Rutkowski, P.
Kata, D.
Kusiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/355786.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser cladding
Inconel 625
tungsten carbide
metal matrix composites
rapid prototyping
Opis:
This study focuses on the investigation of fine (~0.54 μm) tungsten carbide particles effect on structural and mechanical properties of laser cladded Inconel 625-WC composite. Three powder mixtures with different Inconel 625 – WC weight ratio (10, 20 and 30 weight % of WC) were prepared. Coatings were made using following process parameters: laser beam diameter ø ≈ 500 μm, powder feeder rotation speed – 7 m/min, scanning velocity – 10 m/min, laser power – 220 W changed to 320 W, distance between tracks – 1 mm changed to 0.8 mm. Microstructure and hardness were investigated. Coatings produced by laser cladding were crack and pore free, chemically and structurally homogenous. High cooling rate during cladding process resulted in fine microstructure of material. Hardness improved with addition of WC from 396.3 ±10.5 HV for pure Inconel 625, to 469.9 ±24.9 HV for 30 weight % of WC. Tungsten carbide dissolved in Inconel 625 which allowed formation of intergranular eutectic that contains TCP phases.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 531-538
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Material Selection on Durability of Exhaust Valve Faces of a Ship Engine – A Case Study
Autorzy:
Smoleńska, Hanna
Kończewicz, Włodzimierz
Bazychowska, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/102904.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
cobalt alloy
laser cladding
exhaust valve
stop kobaltu
napawanie laserowe
zawór wydechowy
Opis:
Two alloys were used in order to extend the service life of marine engine exhaust valve head. Layers of cobalt base alloys were made of the powders with chemical composition as follow: the layer marked L12; C-1.55%; Si-1.21%; Cr-29.7%; W-9%; Ni-2%; Mo<0.01%; Fe-1.7%; Co-54.83% and the layer marked N; C-1.45%; Co-38.9%; Cr24.13%; Ni-10.43%; W-8.75%; Fe-7.64%; Mo-7.56%; Si-2.59%. Base metal was valve steel after heat treatment. It was consisted of: C-0,374%; Cr-9,34%; Mn-0.402%; Ni-0.344%; Si-2.46%; Mo-0.822%; P-0.0162%; S-0.001%. Layers on the valve faces were produced by laser cladding using the HPDL ROFIN DL020 laser. Grinding treatment is a very popular form of regeneration of seat and valve plug adhesions. Properly performed grinding operation ensures dimensional and shape accuracy of the surface from 7 to 5 accuracy class and surface roughness Ra not less than 0.16 μm, depending on the object and method of grinding. The 75H and 150S types are a significantly simplified form of valve plug face grinders. Finishing treatment was carried out with a Chris-Marine AB75H sander on a sanding stand equipped with a compressed air system - the stand was designed by the author. The sander has been set up to the surface of the valve stem so that the grinding angle of the valve faces is 30°+10°. A flat grinding wheel T1CRA54–K was used for machining. The plunge feed was 0.01 mm/rev. The thickness of the welded layer after grinding was 1.2 mm. Both valves were installed in the ship’s engine and were used in real life. After 2000 hours of operation, the valve marked N was damaged. The valve marked L12 showed no damage and was in operation for the next 1000 hours.
Źródło:
Advances in Science and Technology. Research Journal; 2020, 14, 3; 165-174
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Macroscopic Properties of Filler Metal (BCuP-5) on Cu-plate using Laser Cladding Process
Autorzy:
Lee, Kee-Ahn
Park, Joo Hyun
Joo, Yeun Ah
Powiązania:
https://bibliotekanauki.pl/articles/352063.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser cladding
BCuP-5(Cu-15Ag-5P)
microstructure
switching device
multi-layer
Opis:
This study stacked a thin, dense BCuP-5 (Cu-Ag-P based filler metal) on a Cu-plate using the laser cladding (L.C) process to develop a method to manufacture Ag reducing multilayer clad electrical contact material with an Ag-M(O)/Ag/Cu/BCuP-5 structure. Then, the microstructure and macroscopic properties of the manufactured BCuP-5 coating layer were analyzed. The thickness of the manufactured coating layer was approximately 1.7 mm (maximum). Microstructural observation of the coating layer identified Cu, Ag and Cu-Ag-Cu3P ternary eutectic phases like those in the initial BcuP-5 powder. To evaluate the properties of the manufactured coating layer, hardness and adhesion strength tests were performed. The average hardness of the laser cladded coating layer was 183.2 Hv, which is 2.6 times greater than conventional brazed BcuP-5. The average pull-off strength measured using the stud pull test was 341.6 kg/cm2. Cross-sectional observation of the pulled-off material confirmed that the coating layer and substrate maintained a firm adhesion after pull-off. Thus, the actual adhesion strength of Cu/BcuP-5 was inferred to be greater than 341.6 kg/cm2. Based on the above findings, it was confirmed that it is possible to manufacture a sound Ag reducing multilayer clad electrical contact material using the laser cladding process.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 559-563
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morfologia napawanych warstw na bazie kobaltu po utlenianiu i korozji w gazach spalinowych
Morphology of the clad layers after oxidation and corrosion in exhaust gases
Autorzy:
Smoleńska, H.
Powiązania:
https://bibliotekanauki.pl/articles/257944.pdf
Data publikacji:
2006
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
napawanie laserowe
napawanie PTA
stop kobaltu
zawór
korozja gazowa
clad layer
oxidation
corrosion
exhaust gas
PTA cladding
laser cladding
Opis:
Przedmiotem badań były warstwy wytworzone z proszku na bazie kobaltu, napawane laserowo i plazmowo na przylgnie zaworów wylotowych silników Diesla. Dla wszystkich warstw stwierdzono dobrą jakość, brak pęknięć i jednorodność struktury na powierzchni. Badania degradacji wykonano w specjalnie wykonanej komorze w gazach spalinowych silnika okrętowego. Badania napoin przeprowadzono po 2 miesiącach ekspozycji w podwyższonej temperaturze w zakresie 600-800°C lub po utlenianiu w powietrzu w temperaturze 650°C przez 100 godzin.
Cobalt base cladding layers on the exhaust valve head face, produced by laser and PTA cladding have been investigated. For the all sort of layers good quality, lack of cracks and proper microstructure for the top part of clad was obtained. The investigations on the degradation process run on the special chamber in the exhaust gases of the ship diesel engine. The layers were exposed for two month for the exhaust gases at elevated temperature 600-800°C and after oxidation in air at temperature 650°C for 100 hours. The chemical and phase composition of the scale were determined.
Źródło:
Problemy Eksploatacji; 2006, 1; 115-121
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utrwalanie warstw barwnych na podłożach szklanych za pomocą promieniowania laserowego
Fusing of colour layers on glass substrates using laser radiation
Autorzy:
Sarzyński, A.
Chmielewska, D.
Marczak, J.
Olszyna, A.
Strzelec, M.
Gebel, R.
Powiązania:
https://bibliotekanauki.pl/articles/159164.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
obróbka laserowa
laserowe barwienie szkła
farba ceramiczna
pigment mineralny
laser processing
laser cladding
ceramic paint
mineral pigment
ceramics
Opis:
W Instytucie Ceramiki i Materiałów Budowlanych, we współpracy z Instytutem Optoelektroniki WAT, realizowane są prace nad dekoracją wyrobów szklanych metodą platerowania laserowego. W tej metodzie na powierzchnię szkła nanoszony jest sproszkowany materiał barwny, który po przetopieniu przez promieniowanie laserowe, trwale wiąże się z podłożem. Komputerowe sterowanie przebiegiem procesu obróbki laserowej umożliwia wytwarzanie dowolnych wzorów zdobniczych na powierzchni wyrobu. W artykule opisano niektóre zjawiska fizyczne występujące w procesie obróbki i ich wpływ na spajanie materiału barwnego z podłożem. Opisano obecny stan realizacji pracy oraz przedsięwzięcia zmierzające do zmniejszenia chropowatości nanoszonych warstw. Zamieszczono przykłady wytworzonych wzorów.
A work on application of a laser cladding method to decoration of ceramic products was undertaken in the Institute of Ceramics and Building Materials in cooperation with the Institute of Optoelectronic MUT. The method utilizes application of the powdered colour material on the product surface, and its following fusing and solidification using the laser beam. A modern technique allows the computer control of a laser treatment process as well as creation of free-form decoration templates on the product surface. The paper presents the description and influence of main process physical phenomena on the fusing of colourants with substrates. Examples of decorations are also shown.
Źródło:
Prace Instytutu Elektrotechniki; 2014, 266; 127-144
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laserowe nanoszenie mineralnych warstw barwnych na podłoża ceramiczne
Laser applying of color mineral pigments on ceramic substrates
Autorzy:
Sarzyński, A.
Chmielewska, D.
Gebel, J.
Marczak, J.
Olszyna, A.
Strzelec, M.
Traczyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/160128.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
obróbka laserowa
platerowanie laserowe
farba ceramiczna
pigment mineralny
ceramika
laser processing
laser cladding
ceramic paint
mineral pigment
ceramics
Opis:
W Instytucie Ceramiki i Materiałów Budowlanych, we współpracy z Instytutem Optoelektroniki WAT, podjęto prace dotyczące dekoracji wyrobów ceramicznych metodą platerowania laserowego. W metodzie tej na powierzchnię wyrobu nanoszony jest sproszkowany materiał barwny, który po przetopieniu przez promieniowanie laserowe trwale wiąże się z podłożem. Współczesna technika umożliwia komputerowe sterowanie przebiegiem procesu obróbki laserowej i wytwarzanie dowolnych wzorów zdobniczych na powierzchni wyrobu. W artykule przedstawiono opis i wpływ zjawisk fizycznych występujących w procesie obróbki na spajanie materiału barwnego z podłożem. Zamieszczono przykłady zdobienia ceramiki.
Laser applying of color mineral pigments on ceramic substrates Work on application of laser cladding method to decoration of ceramic products was undertaken in the Institute of Ceramics and Building Materials in cooperation with the Institute of Optoelectronic MUT. Method utilizes application of powdered colour material on the product surface, and its following fusing and solidification Rusing laser beam. Modern technique allows the computer control of a laser treatment process as well as creation of the free-form decoration templates on the product surface. Paper presents the description and influence of main process physical phenomena on the fusing of colourants with substrates. Examples of decorations are also shown.
Źródło:
Prace Instytutu Elektrotechniki; 2012, 256; 319-338
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser cladding of Co-based metallic powder at cryogenic conditions
Autorzy:
Lisiecki, A.
Ślizak, D.
Kukofka, A.
Powiązania:
https://bibliotekanauki.pl/articles/367880.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
laser cladding
cobalt-based powder
cryogenic conditions
forced cooling
napawanie laserowe
proszek na bazie kobaltu
warunki kriogeniczne
chłodzenie
Opis:
Purpose: of this paper was demonstration a novel technique of laser cladding by experimentally composed Co-based metallic powder and forced cooling of the substrate by liquid nitrogen under cryogenic conditions, at the temperature -190°C, for producing clad layers with enhanced microstructure characteristic and properties. Design/methodology/approach: Technological tests of laser cladding were conducted by means of a high power fibre laser HPFL with maximum output power 3.0 kW, and six-axis robot. The experimental Co-based powder was composed for providing high abrasive wear resistance, high resistance for impact load, and also for corrosion resistance at elevated temperature. The unique and novel technique of forced cooling of the substrate was provided by immersing the specimens in the liquid nitrogen bath. The three coaxial nozzle head was designed and custom made to provide precise deposition of the powder delivered into the laser beam irradiation region. The scope of the study included tests of conventional laser cladding at free cooling in ambient air in a wide range of processing parameters, and also trials of laser cladding under cryogenic conditions. The test clad layers produced by conventional laser cladding and by the novel technique of laser powder deposition under cryogenic conditions were investigated and compared. Findings: The obtained results indicate that the novel technique of forced cooling the substrate by liquid nitrogen bath provides lower penetration depth, as well as low dilution of the clad, and also provides higher hardness of the clads. Additionally, it is possible shaping the geometry of the individual bead, providing high reinforcement and low width. Research limitations/implications: The presented results are based just on preliminary test of the novel technique of laser cladding under cryogenic conditions. Therefore, further study and detailed analyse of the influence of the cooling rate on the quality, microstructure, and properties of the deposited coatings are required. Practical implications: The study is focused on practical application of the novel technique for manufacturing of wear resistance coatings characterised with enhanced performance compared to conventional range of application of the laser cladding. Originality/value: Novel technique of laser cladding at forced cooling under cryogenic conditions was demonstrated. The powder used for cladding trials was experimentally composed (not commercially available). The experimental stand custom made was used with custom made powder feeding rate, and also with custom made coaxial nozzle head.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2019, 95, 1; 20-31
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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