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 13 of 13 for “"Re-melting"”.
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Investigation into laser re-melting of inconel 625 HVOF coating blended with WC
… with WC particles onto steel (304) is considered and laser re-melting of the resulting coatings is examined. Laser re-melting process is modeled to determine the melt layer thickness while temperature increase is formulated using the Fourier heating law. The morphological and metallurgical …
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Improvement to the surface finish of additive laser manufactured parts made by selective laser melting
The Selective Laser Melting (SLM) process has been used since the end of last decade for different applications in the industrial sector. The priority of the technique is to produce fully dense and functional metallic parts of very complex design, but it is limited by a few issues such as quality …
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Designing two-stage recycling operations for increased usage of undervalued raw materials
Recycling provides a key strategy to move towards a more sustainable society by partially mitigating the impact of fast-growing material consumption. Recent advances in reprocessing technologies enable recyclers to incorporate low-quality secondary materials into higher quality finished products. …
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Behaviours of bifilms in A356 alloy during solidification: developing observation techniques with 3-D micro x-ray tomography
The reduction of mechanical properties by oxide films has been documented and studied for decades. Among these studies, Campbell proposed that tangled thin oxides created during the filling of a mould become flattened or acquire a spherical shape because of several processes: the penetration of …
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Effect of silicon carbide (SiC) on mechanical and physical properties of solid state recycled aluminium aa6061 by using hot extrusion method
In solid state recycling processes, there are two methods in recycling aluminium which are conventional and direct conversion methods. Direct conversion method is a current approach that excludes the metal chips re-melting process compared to the conventional recycling method. Direct conversion in …
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Understanding the Corrosion of Low-Voltage Al-Ga Anodes
… in seawater due to its low cost and high current capacity. Zinc is often used for its ability to readily corrode, but it has a low current capacity and it operates at very negative voltages, leading to hydrogen generation at the steel cathode, which may cause hydrogen embrittlement. Aluminum …
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Approximate solution of melt depth inside titanium during laser materials processing
The use of lasers has increased in areas of science, engineering and medicine. Their advantages over the traditional methods of thermal application are their ability to localize thermal treatments, ability to deliver high power density and to complete thermal processes in extremely short time …
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Dynamics of Melt-mediated Crystallization of Amorphous Silicon Films
This thesis reports on the new experimental findings and the corresponding conclusions that were made regarding the pulsed-laser-induced melting-and-solidification behavior of a-Si films. In particular, it focuses on investigating the melt-mediated crystallization details that are associated with …
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The archaeology and technology of metal production in the Late Iron Age of the Southern Waterberg, Limpopo Province, South Africa
… inception of metallurgy in southern Africa was relatively late, compared to other regions in Africa, and as a result, this part of the sub-continent was mistakenly thought to have been less innovative during the Iron Age. On the contrary, dedicated materials analyses are showing that starting …
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Copper contamination in end-of-life steel recycling, developing a new strategy from million-tonnes to milligrams
Increasing the share of scrap-based steel production is necessary to achieve CO2 emissions targets. However, the quality of recycled steel is compromised by contaminating elements, of which copper is the most pervasive. Copper from wiring and motors entangles with steel fragments during shredding …
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Uranium-series isotope constraints on magma generation and differentiation in the central Oregon Cascades
… British Columbia, Canada, is the surface expression of NE-directed subduction of the Juan de Fuca microplate beneath North America. Slow subduction of young, hot oceanic lithosphere creates an unusually warm subduction environment at depth. Fore-arc rotation and impingement of Basin and Range …
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New processes in aluminium alloys
L'abstract è presente nell'allegato / the abstract is in the attachment