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Showing 1 to 20 of 39 for “"melt pool"”.
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Modeling of melt pool thermal behavior in laser material
… changes and the Marangoni effect. Since the melt pool dynamics is primarily driven by the interfacial forces, which in turn rely considerably on the melt pool geometry, a free surface tracking method associated with the numerical implementation scheme is proposed. The dissertation …
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Mathematical modeling of the melt pool during a physical vapor deposition process
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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Melt Pool Feature Extraction, A State-Space Model and Spatial Layer-to-Layer Control for Powder Bed Fusion
… tool to monitor a surface temperature field and melt pool morphology in PBF. With melt pool features from camera videos, manufacturing researchers use spatial feature maps to visualize defect locations and control researchers use layer-to-layer control to achieve more uniform melt pools and less …
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Numerical Analysis of the Melt Pool Kinetics in Selective Laser Melting Based Additive Manufacturing of M g2Si Thermoelectric Powders
… sustainable development. Selective Laser Melting (SLM) based additive manufacturing process is a scalable and flexible method that has shown promising results in manufacturing high ZT Bi2T e3 material and is possible to be extended to other material classes such as M g2Si. The physical …
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Inline Coherent Imaging of Laser Additive Manufacturing
… manufacturing techniques such as selective laser melting offer unique capabilities in the manufacture of geometrically complex metal components. The ability of these techniques to fabricate unique part designs of high-strength metals is of great interest to advanced engineering sectors such as …
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Characterization of the Surface Roughness of Overhangs manufactured by Laser Powder Bed Fusion Process using Design of Experiments
… is proposed. First, simulations of the melt pool were performed to understand the impact of primary process parameters on the dimensions of the melt pool. Then, tools to model the melt pool were tested and used in combination with analytical equations to identify an acceptable processing …
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Laser Powder Bed Fusion Process Characterization: Design of Experiments for Dimensionally Accurate Thin Walls
… is proposed. First, simulations of the melt pool were performed to understand the impact of primary process parameters on the dimensions of the melt pool. Then, tools to model the melt pool were tested and used in combination with analytical equations to identify an acceptable processing …
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Framework to Accelerate Parameter Development for Laser Powder Bed Fusion
… is proposed. First, simulations of the melt pool were performed to understand the impact of primary process parameters on the dimensions of the melt pool. Then, tools to model the melt pool were tested and used in combination with analytical equations to identify an acceptable processing …
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Strategies for the Characterization and Virtual Testing of SLM 316L Stainless Steel
The selective laser melting (SLM) process allows for the control of unique part form and function characteristics not achievable with conventional manufacturing methods and has thus gained interest in several industries such as the aerospace and biomedical fields. The fabrication processing …
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Multi-physics modeling of plasma discharge and material removal in micro electro-discharge machining process
… plasma, and the process of formation of melt-pool and material removal at the workpiece. Initially, a model of micro-EDM plasma has been developed using a ’Global Model’ approach in which the plasma is assumed to be spatially uniform, and equations of mass and energy conservation are …
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Thermal and thermomechanical studies of beam-based powder-bed additive manufacturing processes
… manufacturing (EBAM) and selective laser melting (SLM) has a potential to offer innovative solutions to many challenges faced in the manufacturing industry. However, due to complex heat transport and thermomechanical interactions, the physical process of powder-bed AM has not been fully …
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Thermocapillary convection in laser melted pools during materials processing
… encountered during laser welding of metals. Melting and resolidification of the material occurs when the metal undergoes intense, non-uniform irradiation from a concentrated energy source, such a laser. Motion of the liquid metal in the molten region is induced by buoyancy and surface tension …
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Impact and melting dynamics of micron-sized particles on a liquid pool
<p>A detailed understanding of powder-melt pool interactions and powder melting is of great importance for predicting and controlling the workpiece quality during direct energy deposition, a form of metal additive manufacturing. In this work, an organic transparent model system was designed, in …
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Laser surface modification of biomedical alloys
… Surface topology, microstructure and melt pool depth were characterised using the scanning electron microscope. White light interferometry and stylus profilometry were used to determine the surface roughness. X-ray diffractometry was used to investigate the crystallinity and phase …
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Fundamental study of magnetic field-assisted micro-EDM for non-magnetic materials
… through the use of Lorentz forces induced in the melt pool. Single-discharge events were carried out on non-magnetic Grade 5 titanium workpieces to investigate the mechanics of material removal and evaluate the effectiveness of these two techniques. Discharge crater area analysis, high-speed …
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Multi-Physics Sensing and Real-time Quality Control in Metal Additive Manufacturing
… the lack of understanding of multi-physical melt pool dynamics fundamentally impedes the research progress. The scarcity of a customizable laser powder bed platform further restricts the possibility of testing the improvement strategies. Additionally, most state-of-the-art quality inspection …
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Numerical modeling of laser-induced melting and drilling of bulk and powder metals using combined smoothed particle hydrodynamics and ray tracing method
… SPH method is further developed to account for melting and solidification of the target material based on the enthalpy formulation and major interfacial effects, including surface tension force, Marangoni stresses, recoil force due to vapor pressure, mass removal, and evaporative cooling and is …
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Selective laser melting of Ti-35NB alloy: Processing, microstructure and properties
… and tailored properties. The selective laser melting (SLM) is one of the most popular AM techniques, which has the ability to manufacture a wide range of metallic powders in a layer-wise manner and fabricate complex shapes without compromising dimensional accuracy. The toxicity, …
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Computational-Experimental Process Development for Laser Powder Bed Fusion Additive Manufacturing
… commonly used in LPBF, but promise more stable melting conditions during laser melting and potentially allow for finer geometrical resolution. Various spreading strategies are explored using an integrated discrete element-finite element (DEM-FEM) framework and a schematic process window for …
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