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Dissertations / Theses on the topic 'Remelting process'

Author: Grafiati
Published: 8 June 2024
Last updated: 31 July 2025

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1

Hernández-Morales, José Bernardo. "Electromagnetic stirring with alternating current during electroslag remelting." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28385.

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The electroslag remelting process combines both a chemical refining ability and a better control on solidification which produces materials of more uniform properties. In spite of the advantages of this process, segregation-prone alloys are still difficult to produce via ESR, particularly when large ingot diameters are involved. In this context the study of externally applied electromagnetic fields is of great interest. An AC operated stirring device was designed and laboratory-scale experiments were conducted. The solidification structures resulting from the stirring as well as the mixing co
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2

Wani, Nitin Yashwant. "Simulation of thermal stresses in vacuum arc remelting process." Ohio : Ohio University, 1995. http://www.ohiolink.edu/etd/view.cgi?ohiou1178820121.

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3

Polton, 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.

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4

MUCSI, 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.

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Made available in DSpace on 2014-10-09T12:40:50Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:06:54Z (GMT). No. of bitstreams: 1 02949.pdf: 9168361 bytes, checksum: 474a2e1dcf103e26b6863b7d40ff33a1 (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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5

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.

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Le procédé Plasma Arc Melting Cold Hearth Refining (PAMCHR) permet de recycler des chutes de titane afin d’élaborer des alliages de titane de qualité aéronautique. Les travaux de thèse présentés dans ce manuscrit se concentrent sur l’étape d’affinage du procédé. Elle correspond, après fusion de la matière et avant coulée en lingotière, au transport du métal liquide dans un creuset à fond plat en cuivre refroidi à l’eau. L’apport de chaleur du procédé se fait par des torches à plasma, dans un environnement de gaz inerte. Une modélisation tridimensionnelle de l’écoulement thermo-hydrodynamique d
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6

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/.

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A soldagem tem grande importância no setor metroferroviário, pois é empregada na fabricação de componentes estruturais e no acabamento de vagões de passageiros, que em sua maior parte são de aço inoxidável. As juntas soldadas podem apresentar descontinuidades que são interrupções que afetam as propriedades mecânicas e metalúrgicas da junta soldada. A presença destas descontinuidades, dependendo do seu tamanho, natureza ou efeito combinado, pode ocasionar a reprovação da junta soldada, quer pela redução de propriedades mecânicas ou pela não aceitação, segundo critérios estabelecidos em normas.
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7

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.

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Thermal barrier coatings (TBCs) are commonly used for thermal protection of components in modern gas turbine application and typically consisting of ceramic top coat and CoNiCrAlY bond coat (BC), both thermally sprayed. Nanostructured CoNiCrAlY bond coatings were deposited onto Ni-based alloy (Inconel 718) by both HVOF and CGDS spraying techniques. Subsequently the deposits were remelted by electron beam up to depth of about 100 m which resulted in removal of defects on the substrate to the bond coat interface. The primary objective of this thesis was to investigation of the influence of param
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8

Ahn, Seokyoung Beaman Joseph J. "Modeling, estimation, and control of electroslag remelting process." 2005. http://repositories.lib.utexas.edu/bitstream/handle/2152/1494/ahns17441.pdf.

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9

Ahn, Seokyoung. "Modeling, estimation, and control of electroslag remelting process." Thesis, 2005. http://hdl.handle.net/2152/1494.

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10

XIE, JUN-JIE, and 謝俊傑. "Study on die- casting die service life improvement by laser-remelting process." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2bpccz.

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碩士<br>國立中央大學<br>機械工程學系在職專班<br>107<br>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
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11

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.

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Vacuum Arc Remelting (VAR) is a secondary process used for homogenization of high-melting-point and oxygen-sensitive materials such as superalloys and titanium alloys. The VAR process is carried out with the aim of melting a large consumable electrode in such a way that the resulting ingot has improved homogeneity. The Specialty Metals Processing Consortium (SMPC) has spent the past 20 years developing technology to improve control over the final ingot remelting and solidification processes to alleviate conditions that lead to the formation of inclusions and segregation. Channel segregates ar
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12

Chen, Chien-Kai, and 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.

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碩士<br>國立高雄應用科技大學<br>化學工程與材料工程系<br>98<br>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
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13

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.

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Vacuum arc remelting is a secondary melting process used to produce a variety of segregation sensitive and reactive metal alloys. The present day VAR practice for superalloys involves, typically, melting electrodes of 17'' into ingots of 20'' in diameter. Even larger diameter forging stock is desirable. However, beyond 20'' ingots of superalloys are increasingly prone to segregation defects if solidification is not adequately controlled. In the past years a new generation of model-based controllers was developed to prevent segregation in VAR by controlling melt rate, or the total amount of pow
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14

Chien, Kuo-Ching, and 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.

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碩士<br>國立高雄應用科技大學<br>化學工程與材料工程系<br>98<br>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
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15

Liu, Su-Ling, and 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.

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碩士<br>國立高雄應用科技大學<br>化學工程與材料工程系<br>98<br>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 wa
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16

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.

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Melt convection and solid phase movement play an important role in solidification processes, which significantly influence the formation of grain structures and solute segregations. In general, the melt convection and grain movement are a result of buoyancy forces. The densities within melt are different due to the variation of temperature and concentration, leading to thermally and solutally driven melt convection. Similarly, the density differences between the grains and the bulk melt cause the grain movement, leading to solid sedimentation or grain floating, as the case may be. Free, unat
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17

Kumar, 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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Melt convection and solid phase movement play an important role in solidification processes, which significantly influence the formation of grain structures and solute segregations. In general, the melt convection and grain movement are a result of buoyancy forces. The densities within melt are different due to the variation of temperature and concentration, leading to thermally and solutally driven melt convection. Similarly, the density differences between the grains and the bulk melt cause the grain movement, leading to solid sedimentation or grain floating, as the case may be. Free, unatt
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