Laser-optic Measurements of Velocity of Particles in the Powder Stream at Coaxial Laser Cladding

Sergachev, D. V.; Mikhalchenko, A. A.; Ковалев, О. Б.; Кузьмин, В. С.; Grachev, G. N.; Pinaev, P. A.

doi:10.1016/j.phpro.2014.08.163

Cited by 12 publications

(1 citation statement)

References 13 publications

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“…The powder particles velocity was also influenced by the interaction between powders and the laser radiation. In fact, it was observed that when the laser was switched on, the particles were characterised by higher speed [55,56]. This acceleration was related to the light-propulsion caused by the reaction between the material-vapour recoil with the beamed part of the particle [57].…”

Section: Powder Flowmentioning

confidence: 99%

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: Powder Flowmentioning

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

Acceleration of metal drops in a laser beam

et al. 2020

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Different processes require the detachment of metal drops from a solid material using a laser beam as the heat source, for instance laser drop generation or cyclam. These techniques imply that the drops enter the laser beam, which might affect their trajectory. Also, many laser processes such as laser welding or additive manufacturing generate spatters that can be accelerated by the laser beam during flight and create defects on the material. This fundamental study aims at investigating the effects of a continuous power laser beam on the acceleration of intentionally detached drops and unintentionally detached spatters. Two materials were studied: 316L steel and AlSi5 aluminium alloy. High-speed imaging was used to measure the position of the drops and calculate their acceleration to compare it to theoretical models. Accelerations up to 11.2 g could be measured. The contributions of the vapor pressure, the recoil pressure, and the radiation pressure were investigated. The recoil pressure was found to be the main driving effect but other phenomena counteract this acceleration and reduce it by an order of magnitude of one to two. In addition, two different vaporization regimes were observed, resulting respectively in a vapor plume and in a vapor halo around the drop.

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The effects of laser irradiation on an aluminium powder stream in Directed Energy Deposition

Silva

Volpp

Kaplan

2021

Additive Manufacturing

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Laser-optic Measurements of Velocity of Particles in the Powder Stream at Coaxial Laser Cladding

Cited by 12 publications

References 13 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

Acceleration of metal drops in a laser beam

The effects of laser irradiation on an aluminium powder stream in Directed Energy Deposition

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