Investigation on the direct laser metallic powder deposition process via temperature measurement

Bi, Guijun; Gasser, Andrés; Wissenbach, Konrad; Drenker, Alexander; Poprawe, Reinhart

doi:10.1016/j.apsusc.2006.02.025

Cited by 53 publications

(14 citation statements)

References 5 publications

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“…In the LMD process, the process parameters, such as laser power, powder feed rate, z-increment, shielding gas flow and so on, govern the temperature field of molten pool then consequently affect the Marangoni flow and the surface quality [ 54 , 55 ]. Marangoni flow of the molten pool, which is closely related to the temperature gradient, would happen when the material absorbs the inputted laser energy and melt.…”

Section: Surface Qualitymentioning

confidence: 99%

A Review on Macroscopic and Microstructural Features of Metallic Coating Created by Pulsed Laser Material Deposition

2022

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Owing to the unparalleled advantages in repairing of high value-add component with big size, fabricating of functionally graded material, and cladding to enhance the surface properties of parts, the laser material deposition (LMD) is widely used. Compared to the continuous wave (CW) laser, the controllability of the laser energy would be improved and the temperature history would be different under the condition of pulse wave (PW) laser through changing the pulse parameters, such as duty cycle and pulse frequency. In this paper, the research status of temperature field simulation, surface quality, microstructural features, including microstructures, microhardness, residual stress, and cracking, as well as corrosion behavior of metallic coating created by pulsed laser material deposition have been reviewed. Furthermore, the existing knowledge and technology gaps are identified while the future research directions are also discussed.

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Section: Surface Qualitymentioning

confidence: 99%

A Review on Macroscopic and Microstructural Features of Metallic Coating Created by Pulsed Laser Material Deposition

2022

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“…The microstructure in the last layer is usually dendritic, whereas it can be cellular/dendritic structure in the other layers. 5,8,16,33,41,[62][63][64][65][66] The DAS is greatly affected by cooling rate and influences the mechanical properties of the laser-deposited parts. The relationship between DAS and cooling rate has been studied experimentally.…”

Section: Solidification Microstructure In Laser-deposited Materialsmentioning

confidence: 99%

Printed and Hybrid Electronics Enabled by Digital Additive Manufacturing Technologies

2015

Additive Manufacturing

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“…With respect to LMD, harsh environmental conditions of LMD and the resulting high temperature dictate the usage of non-contact height measuring techniques, thus optical techniques are considered the most suitable [13][14][15]. Various approaches for height monitoring systems in the DED processes have been reported in the literature: charged couple device (CCD) cameras [13][14][15][16][17][18][19][20][21][22], laser triangulation displacement sensors [23][24][25][26][27][28], stigmometer [29], structured light 3D imaging [30], and optical coherence tomography [31,32].…”

Section: Introductionmentioning

confidence: 99%

In-Line Height Measurement Technique for Directed Energy Deposition Processes

Borovkov

Yedra

Zurutuza

et al. 2021

JMMP

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Directed energy deposition (DED) is a family of additive manufacturing technologies. With these processes, metal parts are built layer by layer, introducing dynamics that propagate in time and layer-domains, which implies additional complexity and consequently, the resulting part quality is hard to predict. Control of the deposit layer thickness and height is a critical issue since it impacts on geometrical accuracy, process stability, and the overall quality of the product. Therefore, online feedback height control for DED processes with proper sensor strategies is required. This work presents a novel vision-based triangulation technique through an off-axis located CCD camera synchronized with a 640 nm wavelength pulsed illumination laser. Image processing and machine vision techniques allow in-line height measurement right after metal solidification. The linearity and the precision of the proposed setup are validated through off-and in-process trials in the laser metal deposition (LMD) process. Besides, the performance of the developed in-line inspection system has also been tested for the Arc based DED process and compared against experimental weld bead characterization data. In this last case, the system additionally allowed for the measurement of weld bead width and contact angles, which are critical in first runs of multilayer buildups.

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Investigation on the direct laser metallic powder deposition process via temperature measurement

Cited by 53 publications

References 5 publications

A Review on Macroscopic and Microstructural Features of Metallic Coating Created by Pulsed Laser Material Deposition

A Review on Macroscopic and Microstructural Features of Metallic Coating Created by Pulsed Laser Material Deposition

Printed and Hybrid Electronics Enabled by Digital Additive Manufacturing Technologies

In-Line Height Measurement Technique for Directed Energy Deposition Processes

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