Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"near net shape"”.
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An application protocol for near net shape technologies implementation
The adoption of innovative Near Net Shape (NNS) manufacturing technologies can dramatically reduce costs and lead times in established manufacturing processes. However identifying candidate NNS processes and optimizing their implementation is frequently done in an adhoc manner without the benefits …
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Digital twin volume registration for Voxel-based closed-loop machining systems
… the application of registering and machining near-net-shape structures and rough castings. Through the implementation of a Euclidean distance transform and variance calculation, an intensity-based similarity metric is demonstrated over a discrete voxel domain driven by a metaheuristic …
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Grain boundary engineering in additively manufactured polycrystalline materials
… freedom, and the capability to produce complex near-net-shape components with minimal material waste. Grain boundary engineering (GBE) is a well-established approach for enhancing mechanical properties and reducing corrosion susceptibility in polycrystalline materials by increasing the fraction …
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Titanium alloy powder production from waste metal
… of potentially lower cost methods such as near-net shape powder metallurgy techniques. One approach, which has the potential of producing the lowest cost powder available, involves converting titanium waste machine turnings to powder using the hydride-dehydride (HDH) process. The focus of …
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Advancing additive friction stir deposition as a repair technology through smooth particle hydrodynamic simulations.
… manufacturing (AM) process capable of generating near net shape components though layer by layer depositions. AFSD leverages frictional and plastic heat generation to plasticize material inside of a hollow, rotating tool. In addition to the manufacture of near net shape components similar to other …
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Discrete mechanical metamaterials
… of the leading methods for rapid prototyping and near net shape part production. Extension to full scale structures and systems, however, remains a challenge, as cost, speed and performance present orthogonal objectives that are inherently coupled to limited material options, stochastic process …
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Development and evaluation of interfacial structures for hybrid manufacturing
… machine tool. Such a system can be used for near net shape manufacturing and component repair using either similar or dissimilar materials. This dissertation investigates methodologies for laser wire-fed hybrid manufacturing processing for commercially available systems and demonstrates how …
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Development Of Thermally Processed Nanocomposites With Controlled Surfaces
… tool for multifunctional coatings and near-net-shape manufacturing. Further, the theoretical and experimental results are combined in order to explain the mechanisms behind nanostructure retention and enhanced properties. Proper design of experiments, an appropriate material selection …
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Testbeds for quality and porosity control in metal additive manufacturing by selective laser melting
… process that can achieve high local density and near-net shape geometric accuracy. The dynamics of the meltpool and stability of the melt track upon cooling are critical to the microstructure, porosity, and final properties of the solidified material. Recent studies are replete with optimization …
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The effects of deposit thermal history on microstructure produced by uniform droplet spray forming
… spray forming is a process aimed at producing near-net-shape parts directly from the liquid melt by spraying micron-sized droplets onto a movable target. In spray forming, the solidification rate of the deposited material is a key parameter that influences its microstructure formation and …
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Build strategy investigation of TI-6AL-4V produced via a hybrid additive manufacturing process
… (LMD) has been developed with the capability of near-net shape high-performance metal parts fabrication, especially complicated titanium alloys, nickel alloys, and aluminum alloys. However, LMD processed parts usually do not meet end-use requirements without post treatments. In-process part …
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Investigation of Novel Precursor Routes for Incorporation of Titanium Alloys and Nano-Sized Features into Ceramic-Metallic Composites Formed via the TCON Process
… for the creation ofalumina/aluminum interpenetrating phase composites via a reactive metal penetrationprocess. TCON composites are created by immersing silica based ceramic precursors intoa reactive molten aluminum or aluminum alloyed melt. The molten aluminum metalreacts with the precursor …
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Characterization of high cycle fatigue and laser-aided machining and polishing of additively manufactured materials
… sectors. The AM process can manufacture near-net-shape parts with complex geometries. Meanwhile, the LAMP process integrated with an AM system offers a high processing rate, minimum heat-affected zone, and easily adjustable process parameters during machining and polishing. In mechanical …
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Mechanical properties of laser welded semi-solid metal cast A356 alloy
… production rate, and ability to produce complex shaped components. However, HPDC is prone to porosity making it difficult to heat treat and weld. Semi solid metal (SSM) forming has the potential to produce near-net-shape components with high integrity. Due to laminar filling characteristics of …
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Aligned Continuous Cylindrical Pores Derived from Electrospun Polymer Fibers in Titanium Diboride
… particles with the size of ~0.3 - 1 μm. TiB2 near-net-shaped parts with the multi-scale porosities (~50 to 70%) were successfully cast and sintered. The multi-scale porous structure produced from electrospun fibers was characterized both thermally and mechanically, at room temperature. The …
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Performance evaluation of alsi10mg mould insert material fabricated by selective laser melting process
… technique revealed the potential of producing near net shape parts. Only 0.5mm offset was added in the normal direction during the fabrication of PIM tool inserts for post-processing purpose. The total time reduction in fabricating the PIM tool inserts using the combination of SLM and high …
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Fracture mechanics based fatigue and fracture toughness evaluation of SLM Ti-6Al-4V
… for the manufacture of complex designs in its net or near net shape form, which is not possible with conventional manufacturing techniques. There are minimal amounts of material wastage and it potentially eliminates post manufacture machining and processing costs. Ti- 6Al-4V is used in many …
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Carbide formation in a nickel-based superalloy during electron beam solid freeform fabrication
… involves the use of an electron beam to make near-net-shape metal parts without the need for tooling. Material in wire form is fed into a melt pool maintained on the surface of the part by the electron beam and a positioning system causes the deposition to occur in a line-by-line, …
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Investigation of the Processing History during Additive Friction Stir Deposition using In-process Monitoring Techniques
… that uses deformation bonding to create near-net shape 3D components. As a developing technology, a deeper understanding of the processing science is necessary to establish the process-structure relationships and enable improved control of the as-printed microstructure and material …
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Cryomilling and Spark Plasma Sintering of 2024 Aluminium Alloy
… deformation, with the advantage of obtaining near-net shape parts, within the limits of the Powder Metallurgy (PM) route. Even in the case of the part cannot be obtained directly a preform can be produced by Powder Metallurgy and finished by hot working. In this case, Powder Metallurgy is used …
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