A Numerical Study on Metallic Powder Flow in Coaxial Laser Cladding

Líu, Hao; Hao, Jingbin; Yu, Gang; Yang, Haifeng; Wang, Linwei; Han, Zhengtong

doi:10.18869/acadpub.jafm.68.236.25632

Cited by 14 publications

(6 citation statements)

References 11 publications

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“…Moreover, it was observed that an excessive shielding gas flow led to a powder flow defocusing and, as a consequence, a reduction of the process efficiency [60]. The peak of powder concentration could be increased by increasing the powder feed rate [59]. From Figure 11b, it is also possible to observe that the focal point axial distance was unaffected by the powder feed rate.…”

Section: Figure 10 Distribution Of Particles Velocities At a Distance...mentioning

confidence: 88%

“…Hence, it is clear the importance of defining the powder focus plane. The relationships between powder flow characteristics, such as powder concentration and powder focus plane distance, and process parameters were investigated by Liu, et al [59] using a numerical model based on the gas-solid flow. The peak of powder stream focal point and its position were significantly affected by the inner gas flow velocity.…”

Section: Figure 10 Distribution Of Particles Velocities At a Distance...mentioning

confidence: 99%

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An Overview of Physical Phenomena Involved in the Laser Powder Directed Energy Deposition Process

Piscopo¹,

Atzeni²,

Saboori³

et al. 2022

Preprint

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Laser Powder Directed Energy Deposition (LP-DED) is an Additive Manufacturing process in which a laser beam is used to generate a melt pool onto a substrate. The additional material, in form of powder material, is fed into the generated melt pool and a raised track is obtained. The LP-DED process is very powerful for different applications such as the repair operations and the production of functionally graded material, however the application is still limited and one of the main reasons is related to the lack of knowledge in the physics of the process mechanisms. The process is influenced by a huge number of parameters and three main mechanisms can be identi-fied. These mechanisms are the powder flow, the generation of the molten pool and the solidifica-tion process and for each of these mechanisms the process parameters have a different relevance. In this paper, a review of the main mechanisms and the relationship between the process parame-ters and the outcome of each step of the process is presented.

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Section: Figure 10 Distribution Of Particles Velocities At a Distance...mentioning

confidence: 88%

Section: Figure 10 Distribution Of Particles Velocities At a Distance...mentioning

confidence: 99%

An Overview of Physical Phenomena Involved in the Laser Powder Directed Energy Deposition Process

Piscopo¹,

Atzeni²,

Saboori³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…e laser beam intensity is uniformly distributed in the cross 2 Journal of Spectroscopy section perpendicular to the propagation direction. e powder flow transported by the coaxial nozzle converges to a Gaussian distribution on the substrate [18,19]. Each laser track was deposited in six layers.…”

Section: Experimental Designmentioning

confidence: 99%

“…e melt pool diameter increases with increasing laser power; therefore, the number of slag inclusions is decreased when the laser power is increased, which matched the experimental results. It could be inferred that the number of slag inclusions could be reduced by optimisation of the powder feeding process parameters or the rational design of the nozzle, which are both conducive to decreasing the diameter of the powder flow [19].…”

Section: Causes Of Defectsmentioning

confidence: 99%

Processing Window and Microstructure of NiCoCrAlY Coating Deposited on Cast Iron Using Multilayer Laser Cladding

Liu

Chen

et al. 2019

Journal of Spectroscopy

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Cast iron is an iron-carbon alloy widely used in mechanical engineering. Nickel-base or cobalt-base alloy coatings prepared by laser cladding can improve the surface properties of cast iron, thereby increasing the service life of the components; however, due to the poor weldability and high carbon content of cast iron, the use of laser cladding to prepare alloy coatings faces many difficulties. To reduce the brittleness of the bonded interface, laser cladding was applied to the surface of cast iron using a multilayer deposition strategy. Through testing of the single-track laser cladding, the causes of defects in the coating are analysed, including poor bonding, slag inclusions, and pores. An analytical model based on mass and heat conservation is developed, and a processing window of laser tracks without defects is determined thereby. NiCoCrAlY alloy coating prepared by overlapping laser tracks mainly consists of γ-(Fe, Ni) dendrites and interdendritic M7C3 and M23C6 carbides. Although there are no cracks in a single laser track, cracks are detected when laser tracks are overlapped under the same process parameters. The increase in laser power helps to reduce cracking susceptibility on this occasion. The morphology of the grain in NiCoCrAlY alloy coating is mainly epitaxially grown columnar crystals. The increase in microhardness of the coating is mainly attributed to ductile dendrites, precipitated carbides, and grain refinement.

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“…A detailed description of these approaches can be found in the comprehensive reviews by Enwald et al (1996), Gouesbet and Berlemont (1998) and Balachandar and Eaton (2010). Realized and sophisticated EulerianEulerian and Eulerian-Lagrangian models are used when detailed local flow parameters and variables are required at a microscopic level (see Tamayol et al 2008;Mehdizadeh et al 2008;ElBehery et al 2012ElBehery et al , 2013Jamaleddine and Ray 2011;Patro et al 2014;Liu et al 2016). However, many industrial applications such as on-line control and automation require a robust model capable of predicting macroscopic variables (Narimatsu et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Prediction of Pressure Drop in Vertical Pneumatic Conveyors

El-Behery

El-Haroun

Abuhegazy

2017

JAFM

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This paper presents a steady state one-dimensional two-fluid model for gas-solid two-phase flow in a vertical riser. The model is solved using conservative variable approach for the gas phase, and fourth order RungeKutta method is used for the solid phase. The model predictions for pressure drop are compared with available experimental data and with Eulerian-Lagrangian predictions, and a good agreement is obtained. The results indicate that the pressure drop increases as the solid mass flow rate, particle size, and particles density increase. In addition, the model predictions for minimum pressure drop velocity are compared with experimental data from literature and the mean percentage error. MPE for minimum pressure drop velocity is -9.89%. It is found that the minimum pressure drop velocity increases as the solid mass flow, particle size and particle density increase, and decreases as the system total pressure increases.

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A Numerical Study on Metallic Powder Flow in Coaxial Laser Cladding

Cited by 14 publications

References 11 publications

An Overview of Physical Phenomena Involved in the Laser Powder Directed Energy Deposition Process

An Overview of Physical Phenomena Involved in the Laser Powder Directed Energy Deposition Process

Processing Window and Microstructure of NiCoCrAlY Coating Deposited on Cast Iron Using Multilayer Laser Cladding

Prediction of Pressure Drop in Vertical Pneumatic Conveyors

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