The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Carolin Körner - One of the best experts on this subject based on the ideXlab platform.
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Nanoscaled eutectic NiAl-(Cr,Mo) composites with exceptional mechanical properties processed by Electron Beam Melting.
Scientific Reports, 2020Co-Authors: Andreas Förner, Carolin Körner, Sven Giese, C Arnold, Peter Felfer, Steffen Neumeier, Matthias GökenAbstract:Eutectic NiAl-(Cr,Mo) composites are promising high temperature materials due to their high Melting point, excellent oxidation behavior and low density. To enhance the strength, hardness and fracture toughness, high cooling rates are beneficial to obtain a fine cellular-lamellar microstructure. This can be provided by the additive process of selective Electron Beam Melting. The very high temperature gradient achieved in this process leads to the formation of the finest microstructure that has ever been reported for NiAl-(Cr,Mo) in-situ composites. A very high hardness and fracture toughening mechanisms were observed. This represents a feasibility study towards additive manufacturing of eutectic NiAl-(Cr,Mo) in-situ composites by selective Electron Beam Melting.
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Selective Electron Beam Melting of an aluminum bronze: Microstructure and mechanical properties
Materials Letters, 2019Co-Authors: Torsten Wolf, Zongwen Fu, Carolin KörnerAbstract:Abstract In this work, periodic macro-cellular structures with dense struts are successfully fabricated from an aluminum brass by selective Electron Beam Melting (SEBM). The process window for the SEBM of the Cu–Al alloy is developed. The microstructure and the mechanical properties of the Cu–Al samples are studied.
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Selective Electron Beam Melting of a copper-chrome powder mixture
Materials Letters, 2018Co-Authors: Soroush Momeni, Ralf Guschlbauer, Fuad Osmanlic, Carolin KörnerAbstract:Additive manufacturing by selective Electron Beam Melting (SEBM) was used to process a powder mixture consisting of elemental copper and chromium powders (nominal composition: Cu-25Cr). The Melting temperatures of copper and chromium are largely different. As a result, the copper particles start Melting while the chromium ones are still solid. Eventually, also the chromium particles get molten since the local temperatures during SEBM are rather high. The microstructure was analyzed by scanning Electron microscopy (SEM) and focused ion Beam (FIB)-SEM. It was observed that ultra-fine Cr particles are formed and distributed in the Cu matrix due to the fast cooling rate and subsequent spinodal decomposition.
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Macroscopic simulation and experimental measurement of melt pool characteristics in selective Electron Beam Melting of Ti-6Al-4V
International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Daniel Riedlbauer, Thorsten Scharowsky, Robert Friedrich Singer, Paul Steinmann, Carolin Körner, Julia MergheimAbstract:Selective Electron Beam Melting of Ti-6Al-4V is a promising additive manufacturing process to produce complex parts layer-by-layer additively. The quality and dimensional accuracy of the produced parts depend on various process parameters and their interactions. In the present contribution, the lifetime, width and depth of the pools of molten powder material are analyzed for different Beam powers, scan speeds and line energies in experiments and simulations. In the experiments, thin-walled structures are built with an ARCAM AB A2 selective Electron Beam Melting machine and for the simulations a thermal finite element simulation tool is used, which is developed by the authors to simulate the temperature distribution in the selective Electron Beam Melting process. The experimental and numerical results are compared and a good agreement is observed. The lifetime of the melt pool increases linearly with the line energy, whereby the melt pool dimensions show a nonlinear relation with the line energy.
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Fabrication and characterisation of a fully auxetic 3D lattice structure via selective Electron Beam Melting
Smart Materials and Structures, 2017Co-Authors: Franziska Warmuth, Matthias A. Lodes, Lucas Adler, Fuad Osmanlic, Carolin KörnerAbstract:A three-dimensional fully auxetic cellular structure with negative Poisson’s ratio is presented. Samples are fabricated from Ti6Al4V powder via selective Electron Beam Melting. The influence of the strut thickness and the amplitude of the strut on the mechanical properties and the deformation behaviour of cellular structures is studied.
Lars‐erik Rännar - One of the best experts on this subject based on the ideXlab platform.
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Additive Manufacturing of a Cold‐Work Tool Steel using Electron Beam Melting
Steel Research International, 2019Co-Authors: Carlos Botero, Lars‐erik Rännar, Markus Ramsperger, Andrey Koptyug, Aydin Selte, Kenneth Åsvik, Per Skoglund, Stefan Roos, Mikael BäckströmAbstract:Metal additive manufacturing (AM) is on its way to industrialization. One of the most promising techniques within this field, Electron Beam Melting (EBM), is nowadays used mostly for the fabricatio ...
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Investigation of the heterogeneous structure and its effect on mechanical properties of Electron Beam Melting fabricated 316L stainless steel
2019Co-Authors: Jon Olsén, Zhijian Shen, Yuan Zhong, Lars‐erik RännarAbstract:316L stainless steel samples were prepared with Electron Beam Melting. Samples were produced to investigate what parameters and conditions govern the microstructural evolution during the process, a ...
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Micro- and macro-structural heterogeneities in 316L stainless steel prepared by Electron-Beam Melting
Materials Characterization, 2018Co-Authors: Jon Olsén, Andrey Koptyug, Leifeng Liu, Zhijian Shen, Lars‐erik RännarAbstract:Abstract This is a study of the micro- and macrostructural variations in samples of stainless steel with the overall composition of the grade 316L, produced using Electron Beam Melting. Electron Beam Melting is one of the processing methods under consideration for manufacturing some of the International Thermo- Nuclear Experimental Reactor In-Vessel components. Therefore further studies of the homogeneity of the material were conducted. Electron Beam Melting results in a complicated thermal history of the manufactured part giving a significant impact on the microstructure. A cellular structure that is often observed in samples prepared by selective laser Melting was found in the top layers of the specimens. Further down, the structure changed until the cellular structure was almost non-existing, and the grain boundaries had become more pronounced. This revelation of a heterogeneous structure throughout the entire part is crucial for large-scale industrial applications like the Thermo- Nuclear Experimental Reactor to make sure that it is understood that the properties of the material might not be the same at every point, as well as to assure that the correct post-treatment is done. It is also exposed that a significant part of this change is due to molybdenum redistribution inside the sample when it diffuses from the cell boundaries into the cells, and into bigger agglomerates in the grain boundaries. This diffusion seems not to affect the microhardness of the samples.
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Fatigue properties of electrochemical polished and hot isostatic pressed Ti6A14V manufactured by Electron Beam Melting
2018Co-Authors: Rebecca Klingvall Ek, Mikael Bäckström, Lars‐erik RännarAbstract:Fatigue properties of electrochemical polished and hot isostatic pressed Ti6A14V manufactured by Electron Beam Melting
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Fabrication of multiple-layered gradient cellular metal scaffold via Electron Beam Melting for segmental bone reconstruction
Materials & Design, 2017Co-Authors: Maria A. Surmeneva, E Chudinova, Andrei Koptioug, Mikhail S. Tkachev, Svetlana Gorodzha, Roman A. Surmenev, Lars‐erik RännarAbstract:The triple-and double-layered mesh Ti-based alloy scaffolds were successfully fabricated using Electron Beam Melting (EBM). In this study Ti-based alloy cylindrical scaffolds with different 3D arch ...
Joakim Karlsson - One of the best experts on this subject based on the ideXlab platform.
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Thickness dependency of mechanical properties for thin-walled titanium parts manufactured by Electron Beam Melting (EBM®)
2014Co-Authors: Joakim Karlsson, Jukka Lausmaa, Anders Snis, Ronald Aman, Timothy Horn, Harvey West, Håkan Engqvist, Ola L A HarryssonAbstract:Metal powder bed additive manufacturing technologies, such as the Electron Beam Melting process, facilitate a high degree of geometric flexibility and have been demonstrated as useful production te ...
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Optimization of Electron Beam Melting for Production of Small Components in Biocompatible Titanium Grades
2014Co-Authors: Joakim KarlssonAbstract:Additive manufacturing (AM), also called 3D-printing, are technologies where parts are formed from the bottom up by adding material layer-by-layer on top of each other. Electron Beam Melting (EBM) ...
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characterization and comparison of materials produced by Electron Beam Melting ebm of two different ti 6al 4v powder fractions
Journal of Materials Processing Technology, 2013Co-Authors: Joakim Karlsson, Anders Snis, Håkan Engqvist, Jukka LausmaaAbstract:Electron Beam Melting (EBM) has been recognized as a revolutionary technique to produce mass-customized parts to near-net-shape from various metallic materials. The technique produces parts with un ...
Alberto Molinari - One of the best experts on this subject based on the ideXlab platform.
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Microstructure and mechanical properties of Ti‐6Al‐4V produced by Electron Beam Melting of pre‐alloyed powders
Rapid Prototyping Journal, 2009Co-Authors: Luca Facchini, Emanuele Magalini, Pierfrancesco Robotti, Alberto MolinariAbstract:Purpose – The purpose of this paper is the microstructural and mechanical characterization of a biomedical Ti‐6Al‐4V alloy produced by Electron Beam Melting, and the study of the stability of the as‐built microstructure upon heat treatment.Design/methodology/approach – Ti‐6Al‐4V alloy produced by Electron Beam Melting has been mechanically characterized through tensile and fatigue testing. Its microstructure has been investigated by optical observation after etching and by X‐ray diffractometry analysis. The stability of the microstructure of the as‐built material has been deepened carrying out suitable heat treatments, after an analysis by dilatometry test.Findings – The microstructure of a Ti‐6Al‐4V alloy produced by Electron Beam Melting has a very fine and acicular morphology, because of the intrinsically high‐solidification rate of the process. This microstructure is very stable, and the traditional thermal treatments cannot modify it; the microstructure changes significantly only when an amount of st...
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microstructure and mechanical properties of ti 6al 4v produced by Electron Beam Melting of pre alloyed powders
Rapid Prototyping Journal, 2009Co-Authors: Luca Facchini, Emanuele Magalini, Pierfrancesco Robotti, Alberto MolinariAbstract:Purpose – The purpose of this paper is the microstructural and mechanical characterization of a biomedical Ti‐6Al‐4V alloy produced by Electron Beam Melting, and the study of the stability of the as‐built microstructure upon heat treatment.Design/methodology/approach – Ti‐6Al‐4V alloy produced by Electron Beam Melting has been mechanically characterized through tensile and fatigue testing. Its microstructure has been investigated by optical observation after etching and by X‐ray diffractometry analysis. The stability of the microstructure of the as‐built material has been deepened carrying out suitable heat treatments, after an analysis by dilatometry test.Findings – The microstructure of a Ti‐6Al‐4V alloy produced by Electron Beam Melting has a very fine and acicular morphology, because of the intrinsically high‐solidification rate of the process. This microstructure is very stable, and the traditional thermal treatments cannot modify it; the microstructure changes significantly only when an amount of st...
Harvey West - One of the best experts on this subject based on the ideXlab platform.
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Thickness dependency of mechanical properties for thin-walled titanium parts manufactured by Electron Beam Melting (EBM®)
2014Co-Authors: Joakim Karlsson, Jukka Lausmaa, Anders Snis, Ronald Aman, Timothy Horn, Harvey West, Håkan Engqvist, Ola L A HarryssonAbstract:Metal powder bed additive manufacturing technologies, such as the Electron Beam Melting process, facilitate a high degree of geometric flexibility and have been demonstrated as useful production te ...
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Characterization of H13 steel produced via Electron Beam Melting
Rapid Prototyping Journal, 2004Co-Authors: Denis R. Cormier, Ola L A Harrysson, Harvey WestAbstract:Electron Beam Melting (EBM) is a direct-metal freeform fabrication technique in which a 4 kW Electron Beam is used to melt metal powder in a layer-wise fashion. As this process is relatively new, there have not yet been any independently published studies on the H13 steel microstructural properties. This paper describes the EBM process and presents results of microstructural analyses on H13 tool steel processed via EBM.