Laser casting and laser clad-casting: New processes for rapid prototyping and production

Powell, John; Gedda, Hans; Kaplan, Alexander

doi:10.2351/1.5066171

Cited by 3 publications

(2 citation statements)

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“…Laser casting was developed at the Luleå University of Technology [7] and involves the deposition of a laser-melted metal into a mold ( Figure 2). The process parameters are deliberately chosen to prevent the "clad" deposit forming a bond with the substrate, and thus, cast objects can be produced.…”

Section: Introductionmentioning

confidence: 99%

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Melt-solid interactions in laser cladding and laser casting

Gedda

Kaplan

Powell

2005

Metall Mater Trans B

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Experimental data in conjunction with mathematical models are used to explain various aspects of laser casting and laser cladding by the preplaced powder method. For increasing speed, the data can be distinguished between substrate melting, dilution-free clad bonding, bond-free casting, and poor contact breaking the melt track into spheres. Results include a thermodynamic explanation of the wide range of process parameters over which dilution-free clad deposits can be produced, as the process switches from heating of the insulating powder to additional cooling when the melt front reaches the substrate. Also, the interaction of the melt pool with the powder bed is analyzed to identify why laser castings have microscopically uneven surfaces and do not bind with the substrate. The advancement of the melt front through the powder layer is governed by heating, melting, and incorporation of each individual grain. Although most powder grains are in the small size range for the case studied, the few particles up to a factor 3 larger delay and therefore govern the front advancement due to much slower melting and surface tension driven incorporation, depending on the particle size in a nonlinear manner.

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Section: Introductionmentioning

confidence: 99%

“…Starting from a basic solution for a simpler case, continuity liquid mass flow in a cylindrical coordinate system with the radial coordinate r is determined by the flow potential field: [13,15] [6] Spatial derivation yields the velocity field [7] Note that the mass flow rate implicitly results from the calculation.…”

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confidence: 99%