Thèses sur le sujet « Remelting process »
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Hernández-Morales, José Bernardo. « Electromagnetic stirring with alternating current during electroslag remelting ». Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28385.
Texte intégralApplied Science, Faculty of
Materials Engineering, Department of
Graduate
Wani, Nitin Yashwant. « Simulation of thermal stresses in vacuum arc remelting process ». Ohio : Ohio University, 1995. http://www.ohiolink.edu/etd/view.cgi?ohiou1178820121.
Texte intégralPolton, Richard. « Numerical grid generation and its application in the solution of a model of the Vacuum-Arc Remelting (VAR) process ». Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323918.
Texte intégralMUCSI, CRISTIANO S. « Estudo sobre o processo V.A.R. (Vacuum Arc Remelting) escala de laboratorio ». reponame:Repositório Institucional do IPEN, 1996. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10472.
Texte intégralMade available in DSpace on 2014-10-09T14:06:54Z (GMT). No. of bitstreams: 1 02949.pdf: 9168361 bytes, checksum: 474a2e1dcf103e26b6863b7d40ff33a1 (MD5)
Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Décultot, Léa. « Étude et modélisation du procédé de refusion par plasma d’arc en creuset froid (PAMCHR) d’alliages de titane pour des applications aéronautiques ». Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0031.
Texte intégralThe recycling of titanium scraps can be achieved using the Plasma Arc Melting Cold Hearth Refining (PAMCHR) process with the aim of producing aeronautical titanium alloy ingots. In this manuscript, the research work focuses on the refining stage of the process where the liquid is transported in a horizontal copper water-cooled crucible. This important step takes place downstream the melting of the charge and upstream the casting of liquid titanium into the ingot mold crucible. Plasma torches are used as heat source of PAMCHR process, which is conducted under an atmosphere of inert gas. A three-dimensional modeling of the thermo-hydrodynamic flow of the titanium alloy has been set up based on Ansys-Fluent CFD software. The purpose of this tool, named PAM3D, is to improve our understanding of the liquid titanium behavior within the refining crucible. A large number of user functions have been integrated into the model to describe, among other mechanisms, the thermal and momentum transferred from the plasma plume to the surface of the liquid bath. The analysis of these transfers is essential for modeling the process. They are obtained by a study coupling melting tests, carried out in a pilot PAMCHR furnace, and numerical modeling. Numerical results, obtained by this first version of PAM3D are compared to experimental measurements, and the agreement is satisfactory. However, the maximum value of the shear stress, due to the impact of the plasma plume on the bath surface, implemented in the model seems to be underestimated. Moreover, complementary simulations highlight the important role of hydrodynamic forces on the thermal behavior of the bath, and in particular of this shear stress
Souza, Edvaldo Roberto de. « Caracterizações microestruturais e avaliações das propriedades mecânicas das juntas em aço inoxidável AISI 301 L soldadas por MIG e submetidas ao reparo pelo processo TIG ». Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-22082016-143920/.
Texte intégralThe welding has great importance in manufacture of subway cars because it is used in the manufacture of structural components and finishing in passenger cars which are mostly stainless steel. Joints may show the presence of discontinuities. The discontinuities are interruptions that affect the mechanical and metallurgical properties of the weld. The presence of these discontinuities, depending on their size, nature or the combined effect may lead to failure of the weld either by reduction of mechanical properties or non-acceptance criteria established in standards. A structure that has a weld failed during its qualification or inspection by the presence of discontinuities can be retrieved through a rework to be done in this joint. The remelting of the weld using the TIG process without the use of additional material, rework is a technique that can be employed in particular the technical and economic feasibility of the process. This study analyzes the influence that the process of TIG welding rework has on mechanical behavior and microstructure of welded joints by means of: mechanical tests (tensile and Vickers hardness), non-destructive testing (visual inspection and liquid penetrant) and characterization microstructure of the weld. Results of tensile test specimens and fatigue indicated that the repair of the weld beads did not change the mechanical behavior of joints. The joints subjected to repair in which they were removed the ribs of the beads showed changes in the mechanical properties, but also had satisfactory results.
Hroš, Michal. « Optimalizace podmínek dvojitého přetavení elektronovým paprskem v procesu přípravy TBC povlaků ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400832.
Texte intégralAhn, Seokyoung Beaman Joseph J. « Modeling, estimation, and control of electroslag remelting process ». 2005. http://repositories.lib.utexas.edu/bitstream/handle/2152/1494/ahns17441.pdf.
Texte intégralAhn, Seokyoung. « Modeling, estimation, and control of electroslag remelting process ». Thesis, 2005. http://hdl.handle.net/2152/1494.
Texte intégralXIE, JUN-JIE, et 謝俊傑. « Study on die- casting die service life improvement by laser-remelting process ». Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2bpccz.
Texte intégral國立中央大學
機械工程學系在職專班
107
High pressure die-casting is one of the most widely used and important manufacturing method in modern industry, but the working environment is often dangerous, hard and dirty due to its high temperature and high noise. This is the reason why fewer people are willing to devote themselves to the job, and furthermore, most of researches about high pressure die-casting is academic study. One of the most important problem in the die-casting process is die service life improvement, and the problem affects not only capacity of production but also quality. In this paper, die- casting die service life improvement by laser-remelting process is investigated. In the view of microstructure, the main cause of thermal fatigue crack of die-casting die and inhibiting the propagation of the crack is discussed. Finally, finding the high-risk region where thermal fatigue crack occurs is worked out by the application of CAE(Computer Aided Engineering) technology.
Lopez, Luis Felipe. « Implementation of a high-fidelity axisymmetric model in a Vacuum Arc Remelting process ». Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-05-2770.
Texte intégraltext
Chen, Chien-Kai, et 陳建凱. « Denitrification and Deodorization for Fly Ashes Produced from the Waste Aluminum Remelting Process ». Thesis, 2010. http://ndltd.ncl.edu.tw/handle/04540230457830833826.
Texte intégral國立高雄應用科技大學
化學工程與材料工程系
98
Fly ashes with high contents of N element (4.9%) collected from the flue gas for the waste aluminum remelting process are usually treated by landfill. In this study, a hydrolysis reaction using a high-temperature oven reactor for the denitrification of fly ashes was proposed. The effects of experimental parameters, including reaction temperature, the addition of water, and reaction time, on the denitrification efficiency and the N contents of fly ashes, were discussed. The content of N element was measured by an N, O-element analyzer. The results showed that at a high reaction temperature, a long reaction time, and the addition of much water condition, a higher denitrification efficiency could be achieved, while mixing strong acid or alkali at the room temperature, it was hard to remove N atoms. At a high temperature of 1400℃, the N contents could be reduced to 0.02%, however, the high-temperature process is difficult to be proceeded. A better operating condition is to remove N atoms of fly ash by wet pretreatment at final reaction temperature of 850℃ keeping 60 mins and passing through air and steam, the contents of N atoms in fly ashes was decreased to 0.11% with a denitrification efficiency of 97.8%. The removal of N atoms can avoid to the formation of odor NH3 when AlN in fly ash reacts with water. Moreover, from the XRD patterns, very weak intensity of AlN crystal phase with strong Al2O3 peaks were identified.
Lopez, Luis Felipe active 21st century. « Cyber-enabled manufacturing systems (CeMS) : model-based estimation and control of a solidification process ». Thesis, 2014. http://hdl.handle.net/2152/28082.
Texte intégraltext
Chien, Kuo-Ching, et 簡國清. « Removal of Dioxins by Thermal Treatment for Fly Ashes Produced from the Waste Aluminum Remelting Process ». Thesis, 2010. http://ndltd.ncl.edu.tw/handle/91063300802120569532.
Texte intégral國立高雄應用科技大學
化學工程與材料工程系
98
Fly ashes collected from the flue gas for the waste aluminum remelting process adsorbed toxic dioxins (1.675 ng I-TEQ/g) and usually treated by landfill. It will be far-reaching affect to the environment. In this study, a high-temperature oven reactor was used to remove dioxins by thermal desorption principle. The effects of different experimental parameters, including: wet pre-treatment, purge air, purge air/saturated water vapor, desorption temperature, and holding time after reaching the desorption temperature, on the removal efficiency of dioxin were discussed. The results showed that at without wet pre-treatment, without carrier gas (air and steam), and without holding time conditions, a higher removal efficiency of dioxins could be achieved. A better case was at desorption temperature = 400 ℃, the dioxin removal efficiency reached 99.95% (Total I-TEQ) or 99.17% (Total PCDD/Fs), much higher than that at 300 ℃ with a dioxin removal efficiency of 69.49% for Total I-TEQ or 78.81% for Total PCDD/Fs.
Liu, Su-Ling, et 劉素鈴. « Removal of Fluorine Ions from Waste Water by Reacting with Fly Ashes Produced from the Waste Aluminum Remelting Process ». Thesis, 2010. http://ndltd.ncl.edu.tw/handle/96837473813023022229.
Texte intégral國立高雄應用科技大學
化學工程與材料工程系
98
High concentration of fluorine-containing waste water is usually treated by adding excessive calcium-containing coagulants for removing fluorine ions. On the other hand, a large amount of heavy metals in the fly ashes produced form the waste aluminum remelting process need to be treated by solidification method. Both the two process will spend a lot of money. Hence, in this study, by adding fly ashes to react with fluorine ions for forming metal fluoride for reducing the cost was carried out. The effects of experimental parameters, including the waste water/fly ash weight ratio (LSR) and reaction time, on the removal efficiency of fluoride ions and the final concentration of fluoride ions were discussed. Moreover, the addition of anion polymer coagulants and the retention time for reducing the turbidity were also studied. The results showed that at LSR = 17 and reaction time = 30 mins, the concentration of fluoride ions was decreased from 6800 mg/L to 13 mg/L with a removal efficiency of 99.8%. In addition, after 10 mins when the polymer coagulants (0.1%, 1 ml) were added into the waste water, the turbidity was significant reduced from > 1000 NTU to 47 NTU with a concentration of suspended solid of only 3.2 mg/L. Finally, the contents of metals, such as Ca, Fe, Mn, Na, P, and Zn, in the solids collected by filtration decreased, as well as the concentration of metals in the liquid increased, indicating the metals were released from the fly ashes to the liquid (metal ions or nano metal fluoride).
Kumar, Arvind. « Role Of Solid Phase Movement And Remelting On Macrosegregation And Microstructure Formation In Solidificaiton Processing ». Thesis, 2008. https://etd.iisc.ac.in/handle/2005/841.
Texte intégralKumar, Arvind. « Role Of Solid Phase Movement And Remelting On Macrosegregation And Microstructure Formation In Solidificaiton Processing ». Thesis, 2008. http://hdl.handle.net/2005/841.
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