A simple but realistic model for laser cladding

Picasso, Marco; Marsden, C.; Wagnière, J.-D.; Frenk, A.; Rappaz, M.

doi:10.1007/bf02665211

Cited by 254 publications

(100 citation statements)

References 13 publications

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“…The early models were mostly based on a heat transfer model with a necessary consideration of phase transformations, i.e., melting and solidification, but few incorporated fluid flow calculations due to the involved complexity. Picasso et al 5 proposed a simple but realistic model for laser cladding, incorporating the attenuation of laser power due to the absorption of powder flows as well as the dependency of the workpiece absorptivity with respect to the clad geometry. The melt pool shape was simply computed using a threedimensional ͑3D͒ analytical solution, which assumed a predeposited layer of powder on the substrate.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of heat transfer and fluid flow in coaxial laser cladding process for direct metal deposition

Mazumder

2006

Journal of Applied Physics

291

105

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Articles you may be interested inThe coaxial laser cladding process is the heart of direct metal deposition ͑DMD͒. Rapid materials processing, such as DMD, is steadily becoming a tool for synthesis of materials, as well as rapid manufacturing. Mathematical models to develop the fundamental understanding of the physical phenomena associated with the coaxial laser cladding process are essential to further develop the science base. A three-dimensional transient model was developed for a coaxial powder injection laser cladding process. Physical phenomena including heat transfer, melting and solidification phase changes, mass addition, and fluid flow in the melt pool, were modeled in a self-consistent manner. Interactions between the laser beam and the coaxial powder flow, including the attenuation of beam intensity and temperature rise of powder particles before reaching the melt pool were modeled with a simple heat balance equation. The level-set method was implemented to track the free surface movement of the melt pool, in a continuous laser cladding process. The governing equations were discretized using the finite volume approach. Temperature and fluid velocity were solved for in a coupled manner. Simulation results such as the melt pool width and length, and the height of solidified cladding track were compared with experimental results and found to be reasonably matched.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of heat transfer and fluid flow in coaxial laser cladding process for direct metal deposition

Mazumder

2006

Journal of Applied Physics

291

105

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“…Laser surface cladding (LSC) is capable of producing a wide range of surface alloys and composites of required properties. Application of the laser beam cladding in the surface engineering allows to obtain the porosity and cracking free surface coatings containing uniformly distributed hard particles in the softer and tough matrix [71][72][73][74][75]. Laser cladding is the process whereby a new layer of material is deposited on a substrate by laser fusion of blown powders or pre-placed powder coatings.…”

Section: Laser Claddingmentioning

confidence: 99%

“…Schematic steps involved during the laser surface cladding after Refs. [72,75] The sample to be processed is moved under the beam in order to produce strips of hard material. The composite powder is transported by an inert gas stream and injected directly onto the moving substrate to the center of the laser beam spot.…”

Section: Laser Claddingmentioning

confidence: 99%

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Laser modification of the materials surface layer – a review paper

Kusiński¹,

Kąc²,

Kopia³

et al. 2012

Bulletin of the Polish Academy of Sciences: Technical Sciences

107

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Abstract. The state of laser processing in surface materials modification in Poland is reported, based on own experience, coworkers and coauthors results, as well the literature review. The curriculum concerning historical development of lasers and laser technology in Poland, laser-matter interaction, as well basis of different laser techniques applied in materials surface engineering (solid state hardening, melting, alloying, cladding, ablation, shot peening, cleaning and texturing) are reviewed, and compared with results of coauthors, as well with a wide range of Polish authors papers. Finally, it is concluded that overall state of research on laser application in surface engineering in Poland is well developed and still growing industrial application is observed.

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“…Typically, wear-resistant coatings [5] or corrosion-resistant coatings [6] are clad to enhance the surface characteristics. The process is complicated due to the interaction of many variables [7] including the laser power setting, the traversing speed, the amount of powder or wire being fed into the melt pool and the overlap distance between clad tracks.…”

Section: Introductionmentioning

confidence: 99%

Investigation into Heat Treatment and Residual Stress in Laser Clad AA7075 Powder on AA7075 Substrate

Cottam

Luzin

Liu

et al. 2013

Metallogr. Microstruct. Anal.

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The laser cladding of AA7075 powder onto a AA7075 substrate was conducted to evaluate the effect of heat treatment and to measure residual stress between the clad layer and substrate to better understand the effect of laser cladding. The microstructure formed in the clad region was characteristic of a high cooling rate, which is typical for laser cladding. The heat-affected zone (HAZ) showed coarser precipitates when compared with the substrate and was attributed to the heating from the laser. A solution heat treatment followed by aging was employed to restore the strength in the HAZ. Nanohardness traverses of the clad and substrate was performed and it was shown the hardness in the 7075 clad layer was lower than the substrate both pre-and post-heat treatment and was attributed to the vaporization of zinc and magnesium. Neutron diffraction was employed to measure the residual stress both before and after heat treatment. The residual stresses formed in the clad layer were tensile and about 50 MPa in magnitude; heat treatment increased the stress level to approximately 100 MPa.

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A simple but realistic model for laser cladding

Cited by 254 publications

References 13 publications

Numerical simulation of heat transfer and fluid flow in coaxial laser cladding process for direct metal deposition

Numerical simulation of heat transfer and fluid flow in coaxial laser cladding process for direct metal deposition

Laser modification of the materials surface layer – a review paper

Investigation into Heat Treatment and Residual Stress in Laser Clad AA7075 Powder on AA7075 Substrate

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