Advanced process strategy to realize microducts free of powder using selective electron beam melting

Pobel, Christoph R.; Reichel, Sabrina; Fu, Zongwen; Osmanlic, Fuad; Körner, Carolin

doi:10.1007/s00170-019-03615-3

Cited by 7 publications

(2 citation statements)

References 23 publications

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“…Another way to remove powder from cavities and from the surface of specimens is chemical etching, which is not within the scope of current work. [33,34] The efforts to seal prefabricated notches to generate internal cavities free of powder were reported by Pobel et al [35]…”

Section: Variation Of Cell Structure Geometrymentioning

confidence: 99%

Microstructural and Mechanical Characterization of Square‐Celled TRIP Steel Honeycomb Structures Produced by Electron Beam Melting

et al. 2020

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Material-and energy-saving lightweight constructions are of particular interest to the industry since decades, especially for vehicle and aircraft production. One of the ways of reducing the weight in components is to replace a solid matrix by periodically recurring cell or truss structure. Cellular materials such as metallic foams, truss, or honeycomb structures are characterized by high specific energy absorption and rigidness. Due to their high specific stiffness and compressive strength, square honeycomb structures are well suited for energy dissipating stiffeners, such as sandwich panels and bumpers. [1][2][3] However, the production of honeycomb structures using conventional manufacturing methods is very complex. Metallic square-celled honeycomb structures are often produced in two ways: either slotted metal strips are inserted into each other and joined together by soldering, or they are produced by metal extrusion using complex dies. [4,5] Another recently developed technology is the extrusion of powders with a binder and subsequent debinding and sintering. [6,7] In contrast, additive manufacturing (AM) allows producing most of the complex lightweight structures in a single manufacturing step. All of the AM methods are based on the computer-aided design (CAD), taking a model of a component and building it up layer by layer. One of the most advanced AM methods for the fabrication of metallic components is the electron beam powder-bed fusion (EB-PBF) technology, which is called electron beam melting (EBM) in the following. This process belongs to the group of powderbed AM technologies in which powder particles are fused layer by layer. [8,9] The EBM process is somewhat similar to the widely used selective laser melting (SLM) process, although there are principal differences between laser and electron beam. [10] The microstructure of EBM-manufactured materials is often characterized by columnar and epitaxial grain morphology. Continuous melt crystallization through the multiple layers results in the formation of a strong texture and anisotropy. [8,[11][12][13] This phenomenon can even be utilized to produce single crystalline superalloys by adapting EBM scanning strategy. [14,15] However, in case of materials which can undergo phase transformation in the solid state during cooling (Ti-6Al-4V, Ti-6Al-4V doped with Cu or La, titanium aluminide, and so on), the mentioned columnar and textured structure can be avoided.

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Section: Variation Of Cell Structure Geometrymentioning

confidence: 99%

Microstructural and Mechanical Characterization of Square‐Celled TRIP Steel Honeycomb Structures Produced by Electron Beam Melting

et al. 2020

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“…This approach is advantageous for preparing metal workpieces with complex geometries that are difficult for traditional methods. Specific techniques include selective laser sintering (SLS), ,, selective electron beam melting (SEBM), − and selective laser melting (SLM). Among these techniques, SLM has been employed to fabricate metal foams for medical and energy devices.…”

Section: Fabricationmentioning

confidence: 99%

Porous Flow Field for Next-Generation Proton Exchange Membrane Fuel Cells: Materials, Characterization, Design, and Challenges

Zhang

Tao

et al. 2022

Chem. Rev.

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Porous flow fields distribute fuel and oxygen for the electrochemical reactions of proton exchange membrane (PEM) fuel cells through their pore network instead of conventional flow channels. This type of flow fields has showed great promises in enhancing reactant supply, heat removal, and electrical conduction, reducing the concentration performance loss and improving operational stability for fuel cells. This review presents the research and development progress of porous flow fields with insights for next-generation PEM fuel cells of high power density (e.g., ∼9.0 kW L–1). Materials, fabrication methods, fundamentals, and fuel cell performance associated with porous flow fields are discussed in depth. Major challenges are described and explained, along with several future directions, including separated gas/liquid flow configurations, integrated porous structure, full morphology modeling, data-driven methods, and artificial intelligence-assisted design/optimization.

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Characterization of a direct metal printed injection mold with different conformal cooling channels

Kuo

Jiang

Yang

et al. 2020

Int J Adv Manuf Technol

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Advanced process strategy to realize microducts free of powder using selective electron beam melting

Cited by 7 publications

References 23 publications

Microstructural and Mechanical Characterization of Square‐Celled TRIP Steel Honeycomb Structures Produced by Electron Beam Melting

Microstructural and Mechanical Characterization of Square‐Celled TRIP Steel Honeycomb Structures Produced by Electron Beam Melting

Porous Flow Field for Next-Generation Proton Exchange Membrane Fuel Cells: Materials, Characterization, Design, and Challenges

Characterization of a direct metal printed injection mold with different conformal cooling channels

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