Research on ultra-high speed laser cladding process of corrosion resistant layer of tungsten rod for molten salt electrolysis

2021 ◽  
Author(s):  
Mingyi Zhang ◽  
Ping Gao ◽  
Hao Wang ◽  
Xiaobin Jia ◽  
Hongrui Zhao ◽  
...  
Keyword(s):  
Molten Salt ◽  
Laser Cladding ◽  
High Speed ◽  
Molten Salt Electrolysis ◽  
Corrosion Resistant ◽  
Ultra High Speed ◽  
Laser Cladding Process ◽  
Resistant Layer

scholarly journals Enhanced Tribological Properties of LA43M Magnesium Alloy by Ni60 Coating via Ultra-High-Speed Laser Cladding

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 638 ◽  
Author(s):  
Osama Asghar ◽  
Lou Li-Yan ◽  
Muhammad Yasir ◽  
Li Chang-Jiu ◽  
Li Cheng-Xin
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Laser Cladding ◽  
Wear Mechanism ◽  
High Speed ◽  
Surface Engineering ◽  
Energy Dispersive Spectrometer ◽  
Wear Loss ◽  
Cross Sectional ◽  
Ultra High Speed

Laser modification techniques have been widely adopted in the field of surface engineering. Among these modified techniques, ultra-high-speed laser cladding is trending most nowadays to fabricate wear-resistant surfaces. The main purpose of this research is to provide a detailed insight of ultra-high-speed laser cladding of hard Ni60 alloy on LA43M magnesium alloy to enhance its surface mechanical properties. Multiple processing parameters were investigated to obtain the optimal result. The synthesized coating was studied microstructurally by field emission scanning electron microscopy (FESEM) equipped with an energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The microhardness and wear resistance of the Ni60 coating were analyzed under Vickers hardness and pin on disc tribometer respectively. The obtained results show that the dense Ni60 coating was fabricated with a thickness of 300 μm. No cracks and porosities were detected in cross-sectional morphology. The Ni60 coating was mainly composed of γ-Ni and hard phases (chromium carbides and borides). The average microhardness of coating was recorded as 948 HV0.3, which is approximately eight times higher than that of the substrate. Meanwhile, the Ni60 coating exhibited better wear resistance than the substrate, which was validated upon the wear loss and wear mechanism. The wear loss recorded for the substrate was 6.5 times higher than that of the coating. The main wear mechanism in the Ni60 coating was adhesive while the substrate showed abrasive characteristics.

scholarly journals Laser Cladding of Wear- and Corrosion-Resistant Layer on Carbon Steel.

1998 ◽  
Vol 64 (5) ◽  
pp. 763-767
Author(s):  
Hiromi Nagakura ◽  
Kazuhiro Nakata ◽  
Yosioki Honda ◽  
Shogo Tomida
Keyword(s):  
Carbon Steel ◽  
Laser Cladding ◽  
Corrosion Resistant ◽  
Wear And Corrosion ◽  
Resistant Layer

High-speed photography applied to the laser-cladding process

1997 ◽  
Author(s):  
Fabrice Meriaudeau ◽  
Frederic Truchetet ◽  
Christophe Dumont
Keyword(s):  
Laser Cladding ◽  
High Speed ◽  
High Speed Photography ◽  
Laser Cladding Process

Ultra-High-Speed Laser Cladding of Stellite® 6 Alloy on Mild Steel

JOM ◽  
2020 ◽  
Vol 72 (12) ◽  
pp. 4632-4638
Author(s):  
Zefeng Wu ◽  
Ma Qian ◽  
Milan Brandt ◽  
Neil Matthews
Keyword(s):  
Mild Steel ◽  
Laser Cladding ◽  
High Speed ◽  
Ultra High Speed

scholarly journals Laser Cladded Surface Hardening Coating With Gradient of Mechanical Properties

2020 ◽  
Author(s):  
◽  
Sergejs Ločs
Keyword(s):  
Mechanical Properties ◽  
Laser Cladding ◽  
Surface Hardening ◽  
High Speed ◽  
Base Material ◽  
High Speed Steel ◽  
Single Layer ◽  
Quality Characteristics ◽  
Laser Cladding Process ◽  
Steel Aisi

The present dissertation “Laser Cladded Surface Hardening Coating with Gradient of Mechanical Properties” is devoted to the research of laser cladding process for obtaining high quality surface hardening coating, which can be used for hardening and refurbishment of both machine elements and pressure processing technological equipment. The aim of the research was to investigate the possibility of creating a laser cladded single layer surface hardening coating with a gradient of mechanical properties in the normal direction from the surface to the base material, which would allow increasing the crack resistance of the cladded coating and consequently extend the workability of product in manufacturing and refurbishment of machine elements and tools. The present dissertation contains an introduction, a literature analysis part, a description of research methods, a description of technical facilities and materials, and experimental-analytical parts. Chapter 1 covers literature analysis of laser cladding technologies and concepts for the development of advanced coatings with gradient of properties. The current situation in laser cladding of surface hardening and wear resistant coatings is analysed, including information on the parameters of the laser cladding process, as well as current information on achievable coating properties, coating quality characteristics and typical defects. Chapter 2 provides information on the research methodology, equipment, methods and materials. In this paper, metallography of laser cladded beads and coatings was investigated in detail, as well as the morphology, chemical composition, and mechanical and tribo-technical properties of coatings. Chapter 3 describes the experimental research on forming conditions of the laser cladded high-speed steel (AISI M2) single beads with a keyhole in penetration quality characteristics (shape geometry, porosity and amount of carbide-forming elements) in respect to the technological parameters (cladding speed and laser beam defocusing) of the process. In chapter 4 the experimental research of the influence of laser cladding process regimes on the quality characteristics (thickness, depth of penetration, amount of carbide forming elements in the facing layer), morphology and change in mechanical properties (microhardness) in coating-substrate system of high-speed steel (AISI M2) coatings with keyhole in penetration is reviewed. In chapter 5 experimental study of laser cladding process parameters (overlap ratio, cladding speed and laser beam defocusing direction) and anisotropic structure influence on surface properties (hardness and friction coefficient) of high-speed steel coatings after mechanical treatment is described. Chapter 6 describes the experimental study, in which comparative analysis of differently laser cladded high-speed steel coatings using conventional and the new laser cladding method is carried out. As a result of the research, regime frames of the new laser cladding method for deposition of a single bead and a coating with keyhole penetration in to substrate were determined. The results are summarized in figures, tables and graphs. On the basis of regression analysis empirical models of laser cladding process are obtained, which can be used to predict the values of the cladded bead and coating quality characteristics. In the dissertation a new laser cladding method was developed (Latvian patent application P–19–84, date of filing 30.12.2019.), which allows to create single-layer surface hardening coatings with improved properties in the coating and base material transition zone, which may have a positive influence on the residual stress redistribution, especially when using materials with different coefficients of thermal expansion. Thus, this method eliminates the need for interlayer application in the cladding of dissimilar steels. Consequently, it can contribute to increasing the fatigue resistance of items as well as to increasing the durability under thermocyclic conditions. Technological instruction for hardening and refurbishment of surfaces of pressure shaping equipment by laser cladding of coatings with keyhole in penetration was elaborated as the basis for the present dissertation. At the end of the dissertation information about the trial production of the refurbished parts with coatings obtained by new laser cladding method in Latvia and Belarus; and approbation of the results, as well as an insight regarding the development prospects of this method in further research is given.

Recent Advances in Ultra-High-Speed Waveguide Photodiodes for Optical Communication Systems

2009 ◽  
Vol E92-C (7) ◽  
pp. 922-928 ◽  
Author(s):  
Kikuo MAKITA ◽  
Kazuhiro SHIBA ◽  
Takeshi NAKATA ◽  
Emiko MIZUKI ◽  
Sawaki WATANABE
Keyword(s):  
Optical Communication ◽  
Communication Systems ◽  
High Speed ◽  
Recent Advances ◽  
Ultra High Speed ◽  
Optical Communication Systems
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