Annular laser beam based direct metal deposition

Govekar, Edvard; Jeromen, Andrej; Kuznetsov, Alexander; Kotar, Matjaž; Kondo, Masaki

doi:10.1016/j.procir.2018.08.099

Cited by 26 publications

(8 citation statements)

References 12 publications

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“…For instance, Hofmeister, et al [79] showed that during the deposition of a 316L thin wall, the molten pool temperature reached the value of about 2000 K, which is 25% higher than the melting temperature of 316L. Melt pool shape and dimensions depend on the laser beam intensity distribution [80], on the resulting temperature distribution and on the maximum temperature reached into the material. So, it is evident that the temperature value and its distribution are key parameters that significantly affect the melt pool.…”

Section: Thermal Behaviourmentioning

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: Thermal Behaviourmentioning

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

“…The annular laser spot is then transferred coaxially along the axis of the material delivery tube and onto the focusing device, where it is focused onto the workpiece surface by the mirror. By and large, employing an annular laser beam with an axially fed material increases the symmetry of the deposition process, which benefits its stability and robustness [30]. SS 316 coatings utilising a ring-shaped laser spot and discovered that when a ring-shaped beam was used rather of a Gaussian beam, the microstructure was clearly finer.…”

Section: Shape Of Laser Beammentioning

confidence: 99%

Review on surface characteristics of components produced by direct metal deposition process

Kumar

Anand

et al. 2022

JMES

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Direct metal deposition (DMD) is a metal additive manufacturing (AM) process that builds objects layer by layer. The surface properties of DMD components are discussed in this study. The fluctuation of surface attributes such as roughness, finish, texture, and so on as a function of operation parameters has been investigated for a number of materials. This research assists in identifying the optimal process parameters for the material chosen, such as material feed rate, gas flow rate, and laser power, in order to generate the best surface characteristics. The results show that wire feed deposition surpasses powder feed deposition. The laser power and scanning speed of the laser were found to be the most influential process parameters. The study results reveal that the optimum process parameter combinations are material specific and is the keyfactor for obtaining better products with reduced surface roughness and waviness. The microstructural study also explores the material specfic effect in processs parameter combinations. This research could be used to determine or predict the best process parameters for a wide range of industrial materials.

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“…The SLM can not only smoothen the beam for various output energies, but it also allows amplification of nonordinary beam shapes that could open up new application opportunities for the Bivoj laser system; for example, in material processing applications or as an optical parametric chirped pulse amplification (OPCPA) pump source where the frequency doubled [ 24 ] circular flat-top beam is needed. The annular intensity distribution might be interesting in applications where temperature is the key parameter, for example laser heat treatment or laser hardening [ 25 ] , or it can be used to improve deposition process symmetry in direct annular laser beam based metal deposition [ 26 ] .…”

Section: Introductionmentioning

confidence: 99%

Beam shaping in the high-energy kW-class laser system Bivoj at the HiLASE facility

Paliesek,

Navrátil,

Pilař

et al. 2023

High Pow Laser Sci Eng

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A fully automatic fail-safe beam shaping system based on a liquid crystal on a silicon spatial light modulator has been implemented in the high-energy kilowatt-average-power nanosecond laser system Bivoj. The shaping system corrects for gain nonuniformity and wavefront aberrations of the front-end of the system. The beam intensity profile and the wavefront at the output of the front-end were successfully improved by shaping. The beam homogeneity defined by the beam quality parameters was improved two to three times. The root-mean-square value of the wavefront was improved more than 10 times. Consequently, the shaped beam from the second preamplifier led to improvement of the beam profile at the output of the first main cryo-amplifier. The shaping system is also capable of creating nonordinary beam shapes, imprinting cross-references into the beam, or masking certain parts of the beam.

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Annular laser beam based direct metal deposition

Cited by 26 publications

References 12 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

Review on surface characteristics of components produced by direct metal deposition process

Beam shaping in the high-energy kW-class laser system Bivoj at the HiLASE facility

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