The Experts below are selected from a list of 34377 Experts worldwide ranked by ideXlab platform
Neil Hopkinson - One of the best experts on this subject based on the ideXlab platform.
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top surface and side roughness of inconel 625 parts processed using selective Laser Melting
Rapid Prototyping Journal, 2009Co-Authors: Kamran Mumtaz, Neil HopkinsonAbstract:Purpose – Obtaining the required part top surface roughness and side roughness is critical in some applications. Each of these part properties can often be improved to the detriment of the other during selective Laser Melting (SLM). The purpose of this paper is to investigate the selective Laser Melting of Inconel 625 using an Nd:YAG pulsed Laser to produce thin wall parts with an emphasis on attaining parts with minimum top surface and side surface roughness.Design/methodology/approach – A full factorial approach was used to vary process parameters and identify a usable Inconel 625 processing region. The effects Laser process parameters had on the formation of part surface roughness for multi‐layer parts were examined. Processing parameters that specifically affected top surface and side roughness were identified.Findings – Higher peak powers tended to reduce top surface roughness and reduce side roughness as recoil pressures flatten out the melt pool and reduce balling formation by increasing wettabilit...
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high density selective Laser Melting of waspaloy
Journal of Materials Processing Technology, 2008Co-Authors: Kamran Mumtaz, Poonjolai Erasenthiran, Neil HopkinsonAbstract:Abstract In this work, high density Waspaloy ® specimens were produced using selective Laser Melting (SLM). SLM of Waspaloy ® powder was performed using a high power pulsed Nd:YAG Laser. The Laser parameters pulse energy (J), pulse width (ms), repetition rate (Hz) and scan speed (mm/min) were varied. Process parameter optimization was achieved using factorial analysis to investigate the relationship between specific processing parameters and the formation of Waspaloy ® specimens. The optimized processing parameters produced Waspaloy ® specimens that were 99.7% dense. The resultant Laser melted specimen's height, width and contact angles were measured. Specimens were also tested for the occurrence of porosity and observed for microstructure.
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high density selective Laser Melting of waspaloy
Journal of Materials Processing Technology, 2008Co-Authors: Kamran Mumtaz, Poonjolai Erasenthiran, Neil HopkinsonAbstract:In this work, high density Waspaloy® specimens were produced using specially assembled laboratory equipment by Selective Laser Melting (SLM). SLM of Waspaloy® powder was performed using a high power pulsed Nd:YAG Laser. The Laser parameters pulse energy (J), pulse width (ms), repetition rate (Hz) and scan speed (mm/min) were varied. Process parameter optimization was achieved using factorial analysis to investigate the relationship between specific processing parameters and the formation of Waspaloy® specimens. The optimized processing parameters produced Waspaloy® specimens that were 99.3 % dense. The resultant Laser melted specimen’s height, width and contact angles were measured. Specimens were also observed for the occurrence of porosity
Kamran Mumtaz - One of the best experts on this subject based on the ideXlab platform.
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top surface and side roughness of inconel 625 parts processed using selective Laser Melting
Rapid Prototyping Journal, 2009Co-Authors: Kamran Mumtaz, Neil HopkinsonAbstract:Purpose – Obtaining the required part top surface roughness and side roughness is critical in some applications. Each of these part properties can often be improved to the detriment of the other during selective Laser Melting (SLM). The purpose of this paper is to investigate the selective Laser Melting of Inconel 625 using an Nd:YAG pulsed Laser to produce thin wall parts with an emphasis on attaining parts with minimum top surface and side surface roughness.Design/methodology/approach – A full factorial approach was used to vary process parameters and identify a usable Inconel 625 processing region. The effects Laser process parameters had on the formation of part surface roughness for multi‐layer parts were examined. Processing parameters that specifically affected top surface and side roughness were identified.Findings – Higher peak powers tended to reduce top surface roughness and reduce side roughness as recoil pressures flatten out the melt pool and reduce balling formation by increasing wettabilit...
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high density selective Laser Melting of waspaloy
Journal of Materials Processing Technology, 2008Co-Authors: Kamran Mumtaz, Poonjolai Erasenthiran, Neil HopkinsonAbstract:Abstract In this work, high density Waspaloy ® specimens were produced using selective Laser Melting (SLM). SLM of Waspaloy ® powder was performed using a high power pulsed Nd:YAG Laser. The Laser parameters pulse energy (J), pulse width (ms), repetition rate (Hz) and scan speed (mm/min) were varied. Process parameter optimization was achieved using factorial analysis to investigate the relationship between specific processing parameters and the formation of Waspaloy ® specimens. The optimized processing parameters produced Waspaloy ® specimens that were 99.7% dense. The resultant Laser melted specimen's height, width and contact angles were measured. Specimens were also tested for the occurrence of porosity and observed for microstructure.
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high density selective Laser Melting of waspaloy
Journal of Materials Processing Technology, 2008Co-Authors: Kamran Mumtaz, Poonjolai Erasenthiran, Neil HopkinsonAbstract:In this work, high density Waspaloy® specimens were produced using specially assembled laboratory equipment by Selective Laser Melting (SLM). SLM of Waspaloy® powder was performed using a high power pulsed Nd:YAG Laser. The Laser parameters pulse energy (J), pulse width (ms), repetition rate (Hz) and scan speed (mm/min) were varied. Process parameter optimization was achieved using factorial analysis to investigate the relationship between specific processing parameters and the formation of Waspaloy® specimens. The optimized processing parameters produced Waspaloy® specimens that were 99.3 % dense. The resultant Laser melted specimen’s height, width and contact angles were measured. Specimens were also observed for the occurrence of porosity
Jürgen Eckert - One of the best experts on this subject based on the ideXlab platform.
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Additive manufacturing processes: Selective Laser Melting, electron beam Melting and binder jetting-selection guidelines
Materials, 2017Co-Authors: Prashanth Konda Gokuldoss, Sri Kolla, Juergen Eckert, Jürgen EckertAbstract:Additive manufacturing (AM), also known as 3D printing or rapid prototyping, is gaining increasing attention due to its ability to produce parts with added functionality and increased complexities in geometrical design, on top of the fact that it is theoretically possible to produce any shape without limitations. However, most of the research on additive manufacturing techniques are focused on the development of materials/process parameters/products design with different additive manufacturing processes such as selective Laser Melting, electron beam Melting, or binder jetting. However, we do not have any guidelines that discuss the selection of the most suitable additive manufacturing process, depending on the material to be processed, the complexity of the parts to be produced, or the design considerations. Considering the very fact that no reports deal with this process selection, the present manuscript aims to discuss the different selection criteria that are to be considered, in order to select the best AM process (binder jetting/selective Laser Melting/electron beam Melting) for fabricating a specific component with a defined set of material properties.
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Selective Laser Melting of a beta-solidifying TNM-B1 titanium aluminide alloy
Journal of Materials Processing Technology, 2014Co-Authors: Lukas Löber, Florian Pyczak, Uta Kühn, Frank Peter Schimansky, Jürgen EckertAbstract:Abstract The interest for a wider range of useable materials for the technology of selective Laser Melting is growing. In this work we describe a new way to optimize the process parameters for selective Laser Melting of a beta solidifying titanium aluminide. This kind of material has so far not been processed successfully by this method. The new approach is easy to conduct and well transferable to other materials. It is based on the fact that the parts generated from selective Laser Melting can be described by an addition of multiple single tracks. Multiple types of single track experiments are performed and in combination with knowledge from Laser welding tests optimized parameter combinations are derived. Compact samples are built with the optimized process parameters and characterized in terms of microstructure, phase composition and mechanical properties. With this technique the generation of a TNMB1 titanium aluminide alloy sample with a density greater than 99% could be achieved. The mechanical properties are comparable with material produced by conventional techniques.
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Processing metallic glasses by selective Laser Melting
Materials Today, 2013Co-Authors: Simon Pauly, Romy Petters, Lukas Löber, Juergen Eckert, Mihai Stoica, Uta Kühn, Sergio Scudino, Jürgen EckertAbstract:Metallic glasses and their descendants, the so-called bulk metallic glasses (BMGs), can be regarded as frozen liquids with a high resistance to crystallization. The lack of a conventional structure turns them into a material exhibiting near-theoretical strength, low Young's modulus and large elasticity. These unique mechanical properties can be only obtained when the metallic melts are rapidly cooled to bypass the nucleation and growth of crystals. Most of the commonly known and used processing routes, such as casting, melt spinning or gas atomization, have intrinsic limitations regarding the complexity and dimensions of the geometries. Here, it is shown that selective Laser Melting (SLM), which is usually used to process conventional metallic alloys and polymers, can be applied to implement complex geometries and components from an Fe-base metallic glass. This approach is in principle viable for a large variety of metallic alloys and paves the way for the novel synthesis of materials and the development of parts with advanced functional and structural properties without limitations in size and intricacy.
Neil Hopkinso - One of the best experts on this subject based on the ideXlab platform.
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top surface and side roughness of inconel 625 parts processed using selective Laser Melting
Rapid Prototyping Journal, 2009Co-Authors: Kamra Mumtaz, Neil HopkinsoAbstract:Purpose – Obtaining the required part top surface roughness and side roughness is critical in some applications. Each of these part properties can often be improved to the detriment of the other during selective Laser Melting (SLM). The purpose of this paper is to investigate the selective Laser Melting of Inconel 625 using an Nd:YAG pulsed Laser to produce thin wall parts with an emphasis on attaining parts with minimum top surface and side surface roughness.Design/methodology/approach – A full factorial approach was used to vary process parameters and identify a usable Inconel 625 processing region. The effects Laser process parameters had on the formation of part surface roughness for multi‐layer parts were examined. Processing parameters that specifically affected top surface and side roughness were identified.Findings – Higher peak powers tended to reduce top surface roughness and reduce side roughness as recoil pressures flatten out the melt pool and reduce balling formation by increasing wettabilit...
Lukas Löber - One of the best experts on this subject based on the ideXlab platform.
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Selective Laser Melting of a beta-solidifying TNM-B1 titanium aluminide alloy
Journal of Materials Processing Technology, 2014Co-Authors: Lukas Löber, Florian Pyczak, Uta Kühn, Frank Peter Schimansky, Jürgen EckertAbstract:Abstract The interest for a wider range of useable materials for the technology of selective Laser Melting is growing. In this work we describe a new way to optimize the process parameters for selective Laser Melting of a beta solidifying titanium aluminide. This kind of material has so far not been processed successfully by this method. The new approach is easy to conduct and well transferable to other materials. It is based on the fact that the parts generated from selective Laser Melting can be described by an addition of multiple single tracks. Multiple types of single track experiments are performed and in combination with knowledge from Laser welding tests optimized parameter combinations are derived. Compact samples are built with the optimized process parameters and characterized in terms of microstructure, phase composition and mechanical properties. With this technique the generation of a TNMB1 titanium aluminide alloy sample with a density greater than 99% could be achieved. The mechanical properties are comparable with material produced by conventional techniques.
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Processing metallic glasses by selective Laser Melting
Materials Today, 2013Co-Authors: Simon Pauly, Romy Petters, Lukas Löber, Juergen Eckert, Mihai Stoica, Uta Kühn, Sergio Scudino, Jürgen EckertAbstract:Metallic glasses and their descendants, the so-called bulk metallic glasses (BMGs), can be regarded as frozen liquids with a high resistance to crystallization. The lack of a conventional structure turns them into a material exhibiting near-theoretical strength, low Young's modulus and large elasticity. These unique mechanical properties can be only obtained when the metallic melts are rapidly cooled to bypass the nucleation and growth of crystals. Most of the commonly known and used processing routes, such as casting, melt spinning or gas atomization, have intrinsic limitations regarding the complexity and dimensions of the geometries. Here, it is shown that selective Laser Melting (SLM), which is usually used to process conventional metallic alloys and polymers, can be applied to implement complex geometries and components from an Fe-base metallic glass. This approach is in principle viable for a large variety of metallic alloys and paves the way for the novel synthesis of materials and the development of parts with advanced functional and structural properties without limitations in size and intricacy.
