Suppression of the development of pores during laser-induced surface dispersion of TiC into aluminium, by means of a static magnetic field

Velde, O.; Techel, Anja; Grundmann, R.

doi:10.1016/s0257-8972(01)01531-6

Cited by 15 publications

(4 citation statements)

References 7 publications

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“…The gas bubbles formed in the vicinity of the liquid/solid interface and released to the molten pool, are subject to the motion imposed by the flow field of the molten pool and forces acting on the bubbles. The motion of gas bubbles, in liquids where temperature gradients occur, has been the subject of much research in the past, especially for applications requiring de‐gassing of melts 10–20 . In almost all the research, though, modeling of bubble motion has assumed heat transfer only by conduction or in combination with very weak convection (negligible or very small Marangoni number) and creeping flow, and negligible inertia (very small Reynolds number) and buoyancy effects.…”

Section: Introductionmentioning

confidence: 99%

“…The motion of gas bubbles, in liquids where temperature gradients occur, has been the subject of much research in the past, especially for applications requiring de-gassing of melts. [10][11][12][13][14][15][16][17][18][19][20] In almost all the research, though, modeling of bubble motion has assumed heat transfer only by conduction or in combination with very weak convection (negligible or very small Marangoni number) and creeping flow, and negligible inertia (very small Reynolds number) and buoyancy effects. The cases of finite Marangoni number conditions, even though more general, have received very little attention, mainly because of non-linearity in the governing equations, making the solution extremely difficult analytically and requiring the application of numerical solution techniques.…”

mentioning

confidence: 99%

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Modeling of Boundary Porosity Formation in Laser Melting and Re‐Solidification of Ceramics

Triantafyllidis¹,

Li²,

Stott³

2006

Journal of the American Ceramic Society

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Laser melting and re‐solidification has been used to densify and homogenize ceramic surfaces, leading to increased high‐temperature corrosion and erosion resistance. Although complete sealing of pores can be achieved on the surface, pores have been observed in the boundary between the laser‐treated zone and the untreated bulk. This paper investigates the mechanisms of pore formation and the various factors affecting it. A simple analytical model that predicts the maximum final pore diameter and location along the treated zone/untreated bulk boundary is derived, in terms of the materials properties and the processing parameters. Experimental investigations for a range of processing speeds and power densities have verified the model predictions, identifying the effects of processing speed and laser power density on the maximum pore diameter.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Modeling of Boundary Porosity Formation in Laser Melting and Re‐Solidification of Ceramics

Triantafyllidis¹,

Li²,

Stott³

2006

Journal of the American Ceramic Society

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“…While metallic hard materials (carbides, borides and nitrides of metals from the IVb, Vb and VIb group of the periodic table) are in general easily wettable by a metal melt, zirconium oxide can only be wetted by adding titanium powder. Tungsten carbide [6] and titanium carbide [7] have also been dispersed into aluminum alloys. However, most investigations for aluminum-based substrates focus on silicon carbide [8].…”

Section: Introductionmentioning

confidence: 99%

Wear Resistance of Hard Particle Reinforced Copper Alloys Generated by Laser Melt Injection

Warnecke

Seefeld

2020

DDF

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Highly conductive copper alloys are used for several tools in casting and welding technology. In order to improve the poor wear resistance of these alloys, metal matrix composite (MMC) layers were generated by laser melt injection (LMI). During LMI, a weld pool is induced on a substrate by a laser beam and a wear-resistant filler material is injected into this weld pool by a powder nozzle. In contrast to laser cladding, the filler material remains in the solid state and the substrate works as matrix material. Thereby, specific material properties of the substrate - e.g. a high thermal conductivity - can be provided not only in the core of the part but also within the coating. Fused tungsten carbide (FTC) was used as reinforcing material. It was shown that homogeneous MMC layers out of the copper alloy Hovadur® CNCS and FTC can be produced by laser melt injection. High process velocities of 8.75 m/min could be reached. For assessing the wear resistance, oscillating wear tests with counterparts made of steel were carried out and the wear height and the wear volume were determined. The particle reinforcement lead to a significant increase in wear resistance. Only one wear mechanism - abrasion - was identified.

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“…Usually, LMI works at welding speeds between 0.3 m/min and 0.8 m/min [4,5]. To reach a high economical efficiency, welding speeds up to 7.5 m/min, corresponding to a dispersing rate of 7500 mm²/min, were intended.…”

Section: Introductionmentioning

confidence: 99%

High-Speed Laser Melt Injection of Tungsten Carbide in Highly Conductive Copper Alloys

Warneke

Seefeld

2019

KEM

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For the first time, metal matrix composite (MMC) layers on parts made of highly conductive copper alloys have been generated by laser melt injection (LMI). In order to ensure a sufficient absorption efficiency, different kinds of surface modification were investigated. Welding speeds up to 7.5 m/min can be obtained. When increasing the dispersing rate, the process efficiency, which is the product of absorption efficiency and thermal efficiency, increases. At high dispersing rates, some spherical fused tungsten carbide (SFTC) particles are slightly deformed or partly fused together without decreasing the hardness.

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Suppression of the development of pores during laser-induced surface dispersion of TiC into aluminium, by means of a static magnetic field

Cited by 15 publications

References 7 publications

Modeling of Boundary Porosity Formation in Laser Melting and Re‐Solidification of Ceramics

Modeling of Boundary Porosity Formation in Laser Melting and Re‐Solidification of Ceramics

Wear Resistance of Hard Particle Reinforced Copper Alloys Generated by Laser Melt Injection

High-Speed Laser Melt Injection of Tungsten Carbide in Highly Conductive Copper Alloys

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