Powder Deposition Systems Used in Powder Bed-Based Multimetal Additive Manufacturing

Neirinck, Bram; Li, X.; Hick, Matthias

doi:10.1021/accountsmr.1c00030

Cited by 31 publications

(14 citation statements)

References 12 publications

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“…As known for example the powder morphology is directly related to the cooling rate during atomization that is affected by melting temperature of the metal or alloy, atomization pressure, free-fall distance, and gas to metal ratio. The angle of repose (AOR, α) can be calculated via (1) in which H is the height, D is the diameter of the formed powder cone as given in (Equation ( 1)):…”

Section: Cocrwmo Powders Characteristicsmentioning

confidence: 99%

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Spreadability of Metal Powders for Laser-Powder Bed Fusion via Simple Image Processing Steps

Vakifahmetoğlu

Hasdemir

2021

Preprint

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This paper investigates the spreadability of the spherical CoCrWMo powder for Laser- Powder Bed Fusion (PBF-LB) by using image processing algorithms coded in MATLAB. Besides, it also aims to examine the spreadability correlation with the other characteristics such as flow rate, apparent density, angle of repose. Powder blends in four different particle size distributions are prepared, characterized, and spreadability tests are performed with the PBF-LB. The results demonstrate that an increase in fine particle ratio by volume (below 10 µm) enhances the agglomeration and decreases the flowability, causing poor spreadability. These irregularities on the spread layers are quantified with simple illumination invariant analysis.

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Section: Cocrwmo Powders Characteristicsmentioning

confidence: 99%

“…The angle of repose (AOR, α) can be calculated via (1) in which H is the height, D is the diameter of the formed powder cone as given in (Equation ( 1)):…”

Section: Cocrwmo Powders Characteristicsmentioning

confidence: 99%

Spreadability of Metal Powders for Laser-Powder Bed Fusion via Simple Image Processing Steps

Vakifahmetoğlu

Hasdemir

2021

Preprint

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“…The authors of [20] investigated the possibility of using the L-PBF process to fabricate graded samples using In718 and Ti6Al4V powders utilizing intermediate layers of mixed powders with a different ratio. The first commercial multimaterial recoating system for the L-PBF machines was recently introduced by Aerosint [24,25] suggesting the importance of multimaterial AM development. It uses mechanical forces to hold the powder on the drum and can release it at the desired location, generating a 2D single material image in a line-by-line manner.…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of Ti/Ti64 Graded Material Manufactured by Laser Powder Bed Fusion

et al. 2021

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Multimaterial additive manufacturing is an attractive way of producing parts with improved functional properties by combining materials with different properties within a single part. Pure Ti provides a high ductility and an improved corrosion resistance, while the Ti64 alloy has a higher strength. The combination of these alloys within a single part using additive manufacturing can be used to produce advanced multimaterial components. This work explores the multimaterial Laser Powder Bed Fusion (L-PBF) of Ti/Ti64 graded material. The microstructure and mechanical properties of Ti/Ti64-graded samples fabricated by L-PBF with different geometries of the graded zones, as well as different effects of heat treatment and hot isostatic pressing on the microstructure of the bimetallic Ti/Ti64 samples, were investigated. The transition zone microstructure has a distinct character and does not undergo significant changes during heat treatment and hot isostatic pressing. The tensile tests of Ti/Ti64 samples showed that when the Ti64 zones were located along the sample, the ratio of cross-sections has a greater influence on the mechanical properties than their shape and location. The presented results of the investigation of the graded Ti/Ti64 samples allow tailoring properties for the possible applications of multimaterial parts.

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“…This motivates the consideration of alternative powder feeding technologies that could accommodate a broader range of feed materials. Early work in additive manufacturing explored a variety of different powder delivery strategies (see, e.g., [8] for an early review and [26] for a review on multi-material solutions). Many of the explored techniques took inspiration from mature industries (e.g., pharmaceuticals, food, and automotive) where the delivery of granular materials is a vital step in manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Vibratory Powder Feeding for Powder Bed Additive Manufacturing Using Water and Gas Atomized Metal Powders

Sinclair

Edinger²,

Sparling

et al. 2021

Materials

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Commercial powder bed fusion additive manufacturing systems use re-coaters for the layer-by-layer distribution of powder. Despite the known limitations of re-coaters, there has been relatively little work presented on the possible benefits of alternative powder delivery systems. Here, we reveal a feeding technology that uses vibration to control flow for powder bed additive manufacturing. The capabilities of this approach are illustrated experimentally using two very different powders; a ‘conventional’ gas atomized Ti-6Al-4V powder designed for electron beam additive manufacturing and a water atomized Fe-4 wt.% Ni alloy used in powder metallurgy. Single layer melt trials are shown for the water atomized powder to illustrate the fidelity of the melt tracks in this material. Discrete element modelling is next used to reveal the mechanisms that underpin the observed dependence of feed rate on feeder process parameters and to investigate the potential strengths and limitations of this feeding methodology.

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Powder Deposition Systems Used in Powder Bed-Based Multimetal Additive Manufacturing

Cited by 31 publications

References 12 publications

Spreadability of Metal Powders for Laser-Powder Bed Fusion via Simple Image Processing Steps

Spreadability of Metal Powders for Laser-Powder Bed Fusion via Simple Image Processing Steps

Structure and Properties of Ti/Ti64 Graded Material Manufactured by Laser Powder Bed Fusion

Vibratory Powder Feeding for Powder Bed Additive Manufacturing Using Water and Gas Atomized Metal Powders

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