Laser Cladding
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Characterization of Phase Transformations and Microstructural Changes in an API 5CT L80 Steel Grade During Ni Alloy Laser Cladding
The superficial coatings in micro-alloyed steel pipes has been a pointed way to decrease the corrosion problems in oil and gas industry. However, little emphasis has been given to the substrate. The effects of the deposition method on the steel microstructure and properties are still not well described. In this context, this work studied the effect of Ni sup
Mat. Res.. Publicado em: 26/07/2018
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2. Laser Cladding of Fe-based Metallic Glass/MoS2 Self-lubricating Composites: Effect of Power and Scanning Speed
MoS2 powder has been used to form "self-lubricating" composite coatings, which are very useful to increase the lifetime of machines where liquid lubricants cannot be used. In this work, amorphous overspray powder of Fe60Cr8Nb8B24 (at%) alloy was mixed with 5wt.% MoS2 powder and it was used to produce single tracks on AISI 1020 steel substrates by laser cladd
Mat. Res.. Publicado em: 01/02/2018
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3. Microstructural Evolution and Phase Transformation in Laser Cladding of Cr and Mo Powder on Grey Cast Iron: Mixture Design of Experiment (DOE)
Laser cladding on grey cast iron at high power processing was investigated for microstructural evolution and phase transformation to enhance surface properties. Cladding was designed using a mixture of DOE with peak power (Pp) and pulse repetition frequency (PRF), and a mixture component of Cr and Mo ratio as factors. Microstructural findings indicated absol
Mat. Res.. Publicado em: 21/11/2017
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4. Metallic Glass Formation Upon Rapid Solidification of Fe60Cr8Nb8B24 (at%) Alloy through LASER Cladding and Remelting
Fe60Cr8Nb8B24 (at%) amorphous powder and ingot were submitted to LASER cladding and remelting process, respectively. Fe-based coatings were produced using different LASER processing parameters and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Vickers microhardness. All coatings obtained by LASER cladding (LC) and layers obt
Mat. Res.. Publicado em: 17/11/2017
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5. Synthesis of Vanadium Interface for HFCVD Diamond Deposition on Steel Surface
Laser cladding of vanadium carbide powder developed an interlayer on AISI D6 steel as a diffusional barrier and to relief thermal residual stress. Laser cladding experiments varied resolution (DPI) and scanning speed (mm/s). CVD diamond deposition on this interface went on by HFCVD technique. The coatings were characterized by X-ray diffraction analysis (XRD
Mat. Res.. Publicado em: 06/07/2017
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6. Evaluation of hydrogen-Induced cracking resistance of the In625 laser coating system on a C-Mn steel substrate
Abstract The corrosion of C-Mn steels in the presence of hydrogen sulfide (H2S) represents a significant challenge to oil production and natural gas treatment facilities. The failure mechanism induced by hydrogen-induced cracking (HIC) in a Inconel 625 coating / C-Mn steel has not been extensively investigated in the past. In the present work, an API 5CT ste
REM, Int. Eng. J.. Publicado em: 2017-06
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7. Diamond Films on Stainless Steel Substrates with an Interlayer Applied by Laser Cladding
The objective of this work is the Hot Filament Chemical Vapor Deposition (HFCVD) of diamond films on stainless steel substrates using a new technique for intermediate barrier forming, made by laser cladding process. In this technique, a powder layer is irradiated by a laser beam to melt the powder layer and the substrate surface layer to create the interlaye
Mat. Res.. Publicado em: 06/03/2017
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8. Liga NiCrSiBC: Microestrutura e Dureza de Revestimentos Processados a Arco e a Laser
A técnica de processamento é determinante sobre características de um revestimento. Isso porque o aporte térmico, que depende da técnica e dos parâmetros, tem influência sobre a diluição e a taxa de solidificação. Em ligas com baixa complexidade metalúrgica, o impacto do processamento com técnicas de deposição que impõem maior taxa de resfria
Soldag. insp.. Publicado em: 2015-03
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9. Sistemas de sensores ópticos baseados em fibra óptica de perfil-W dopada com Érbio / Optical sensing systems based on Erbium-doped W-fiber
Depressed-cladding (often referred to as dual-clad or "W"- fiber) fibers with fundamental-mode cutoffs provide high distributed losses at long wavelengths and low losses at short wavelengths. The magnitude of the abrupt transition between low-loss at short wavelengths and high-loss at long wavelengths exceeds 200 dB/km and is found to be extremely sensitive
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/07/2012
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10. Detecçăo e estudo da microvazăo de líquidos em fibras de cristal fotônico usando difraçăo na microestrutura
In this work, we introduce photonic crystal fibers and the study of liquid flow within those, by observing changes in the diffraction pattern generated in a a laser beam laterally incident in the fiber. By launching the laser beam perpendicularly onto the side of the photonic crystal fiber, a characteristic diffractive pattern is created by the cladding micr
Publicado em: 2010
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11. Fabricação e caracterização de Guia de Onda Polimerica a base de PMMA modificado por plasma de CHF3 / Polymeric optical waveguides fabricated by plasma fluorination process
Polymeric optical devices have been studied in communication and interconnection optics due to the intrinsic versatility of polymers molecular structure, that allows advantageous refractive index modeling for core and cladding, and also to their easy fabrication process or patterning capability. PMMA, polymethylmetacrylate, shows the best optical properties
Publicado em: 2007
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12. Laser alloying of AINi alloy on an AI substrate / Produção de uma liga AlNi por refusão com laser
O laser atualmente é uma eficiente ferramenta para tratamentos de superficie, atingindo uma área restrita, ou seja, alterando propriedades das regiões superficiais sem alterar o material como um todo. Dentre os tratamentos superficiais com laser pode citar-se a Formação de ligas de Superficie (Alloying) e o Formação de Ligas de Camadas Superficiais (C
Publicado em: 2001