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Relevant bibliographies by topics / Duplex casting

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Academic literature on the topic 'Duplex casting'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Duplex casting"

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Kalandyk, B. "Microstructure and Abrasive Wear Resistance of 18Cr-4Ni-2.5Mo Cast Steel." Archives of Foundry Engineering 12, no. 4 (December 1, 2012): 81–84. http://dx.doi.org/10.2478/v10266-012-0111-0.

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Abstract An influence of a decreased Cr content on the microstructure of the highly alloyed Cr-Ni cast steel, duplex type, melted under laboratory conditions, was characterized in the paper. The microstructure investigations were performed in the initial state and after the heat treatment (solution annealing) at 1060°C as well as the phase transformation kinetics at continuous cooling was measured. The wear resistance of the investigated cast steel was tested and compared with the 24%Cr-5%Ni-2.5%Mo cast steel. The Cr content decrease, in ferritic-austenitic cast steels (duplex), from 24-26%Cr to 18% leads to the changes of the castings microstructure and eliminating of a brittle σ phase. In dependence of the casting cooling rate, apart from ferrite and austenite, also fine martensite precipitates occur in the casting structure. It was shown that the investigated cast steel is characterised by a slightly lower wear resistance than the typical cast steel duplex grades.

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Abdulkadar, Sama. "RENAL CASTING OF A DUPLEX COLLECTING SYSTEM." International Journal of Advanced Research 7, no. 3 (March 31, 2019): 1087–89. http://dx.doi.org/10.21474/ijar01/8739.

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Niinomi, Mitsuo, Toshikazu Akahori, Tsutomu Takeuchi, and Shigeki Katsura. "Dental Precision Casting of Ti-29Nb-13Ta-4.6Zr Using Calcia Mold." Materials Science Forum 475-479 (January 2005): 2303–8. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2303.

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Duplex calcia coating method where firstly fine calcia was coated on wax pattern and then fine calcia reinforced silica fiber was coated on the fine calcia coated wax pattern, that is, duplex calcia coating method, was applied for making mold. The surface of Ti-29Nb-13Ta-4.6Zr cast using the duplex calcia coating method show very fine metallic lust. The thickness of alpha case formed on the surface of Ti-29Nb-13Ta-4.6Zr is much thinner comparing with the case where the commercial magnesia mold for casting conventional titanium and its alloys for dental applications is used. The duplex calcia coating method is highly expected to be put into practical use for dental precision casting of Ti-29Nb-13Ta-4.6Zr. The dental crown of Ti-29Nb-13Ta-4.6Zr is successfully fabricated using duplex calcia coating method.

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Ohmi, Tatsuya, Kazuhisa Takahashi, and Masayuki Kudoh. "Laser Surface Modification of Al-Cr Alloy Castings Produced by Centrifugal Duplex Casting." Journal of the Japan Institute of Metals 65, no. 11 (2001): 1038–44. http://dx.doi.org/10.2320/jinstmet1952.65.11_1038.

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Panjan, P., M. Čekada, R. Kirn, and M. Soković. "Improvement of die-casting tools with duplex treatment." Surface and Coatings Technology 180-181 (March 2004): 561–65. http://dx.doi.org/10.1016/j.surfcoat.2003.10.119.

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Lee, Sang Mok, S. Yang, S. T. Kim, Y. S. Park, and B. M. Moon. "Centrifugal Casting Practice and Microstructure and Mechanical Properties of a 2205 Duplex Stainless Steel." Materials Science Forum 475-479 (January 2005): 2527–32. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2527.

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Microstructural features, mechanical properties, and corrosion properties of a SAF2205 duplex stainless steel (DSS) were systematically investigated as functions of cooling rate during casting and heat treatment conditions. The choice of a duplex stainless steel was a SAF2205 alloy, of which composition is 0.03C, 21~23Cr, 4.5~6.5Ni, 2.5~3.5Mo, 0.08~0.2N, 1.0Si, and 2.0Mn with remaining Fe. A 5-stepped sand mold and the permanent Y-block mold were used to check the effect of cooling rate during solidification. The microstructural characteristics, such as grain size, the d/γ ratio, the existence of the carbides and σ phase has been noticed to greatly change with the variation of cooling rate during the casting procedure. Various heat treatment conditions were also examined to achieve the optimized mechanical properties of DSS. Based on the preliminary examination, the feasibility study of utilization of centrifugal casting has been carried out for the production of better quality DSS pipe components. Melting and casting practices of DSS during centrifugal casting in an air atmosphere were systematically investigated in order to obtain the optimized process parameters.

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Gebauer-Teichmann, Andreas, Klaus Klimek, and Kyong-Tschong Rie. "Multifunktionale Duplex-PACVD-Schichtsysteme im AluminiumdruckgussMultifunctional duplex PACVD layer systems for aluminium die casting." Vakuum in Forschung und Praxis 17, no. 5 (October 2005): 262–65. http://dx.doi.org/10.1002/vipr.200500268.

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Tkachenko, S. S., V. O. Yemelyanov, and K. V. Martynov. "Modern materials and technologies in the production of artificial casting." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 3 (September 10, 2021): 78–81. http://dx.doi.org/10.21122/1683-6065-2021-3-78-81.

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The publication highlights the production of artistic castings by investment casting using combined ceramic molds. The features of the application of a refractory coating, duplex curing of ceramic shells, cutting of molds, removal of the model composition, annealing of ceramic molds, pouring and separation of the gating‑feeding system under conditions of mass production are considered. Hydrolyzed ethyl silicate (ETS) and aqueous alkaline silica sol are used as a binder. The hydrolysis is carried out with an acidic catalyst. The strength of forms on an aqueous binder before calcination (bending strength σi) is from 1.5 to 2 MPa. The presented technology allows flexible coverage of the entire range of art products. Castings weighing from 5 to 10 kg can be produced in one batch, which significantly reduces the production cycle.

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Takeda, Tohru, and Kazumi Minagawa. "Slip casting of duplex phase stainless steel fine powders." Journal of the Japan Society of Powder and Powder Metallurgy 37, no. 2 (1990): 198–202. http://dx.doi.org/10.2497/jjspm.37.198.

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Klimek, K. S., H. Ahn, I. Seebach, M. Wang, and K. T. Rie. "Duplex process applied for die-casting and forging tools." Surface and Coatings Technology 174-175 (September 2003): 677–80. http://dx.doi.org/10.1016/s0257-8972(03)00365-7.

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Dissertations / Theses on the topic "Duplex casting"

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Ávila, Braz Thaís. "Shrinkage Calculation in the Continuous Casting of Duplex Stainless Steel." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76516.

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Björn, Linnéa. "Investigation of Hot Ductility Gradients in Duplex Stainless Steel in the Beginning of the Continuous Casting Proces." Thesis, KTH, Materialvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160892.

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The steel quality is deteriorated at a continuous casting start. Therefore, material from the first cast slab is cut off and re-melted in the melt shop. If too little is discarded, the inferior quality in the retained length can cause defects like edge cracks during subsequent hot rolling. This means that manufacturing resources are wasted on processing inferior material which has to be re-melted anyways at a later stage. On the other hand, if an excessive length of the first slab is re-melted, good material is wasted. In either case, optimizing the length of the start-scrap material is both economically and environmentally beneficial. Edge cracks are more common in the beginning of the first slab, even though a part is cut off. It is likely that the edge cracks arise due to reduced hot ductility in the first cast material. The purpose of this project is to optimize where the cut should be made in order to achieve the best yield. The hot ductility was investigated by performing hot tensile- and bending tests. The hot tensile tests indicate high hot ductility for the investigated specimens. The area reduction, which is correlated to the hot ductility, is above 70 % for all the investigated specimens. When considering the average area reduction while neglecting possible differences between the heats, the specimens from one meter tend to have a lower hot ductility compared to the other specimens. However, the differences are small. No difference can be seen between edge and middle specimens when only looking at the tensile tests. The bending tests did not crack without notches, even though the maximum load and a test temperature of 750 °C was used. That strongly indicates high hot ductility as well. By using notches, the bending tests cracked and it was shown that edge specimens and specimens from one meter cracked the most. No edge cracks were found, after hot rolling, on the first cast slabs from the investigated heats.
Vid en stränggjutstart är kvalitén på första slaben sämre. På grund av detta så skärs en bit, av det först gjutna slabet av och smälts om i stålverket. Om för lite material kapas av kan det leda till defekter, såsom kantbrakor, under den efterföljande varmvalsningen. Detta innebär att resurser används i onödan för att tillverka material av otillräcklig kvalitet som sedan ändå måste smältas om i ett senare steg. Skärs istället för mycket material bort så smälts prima material om i onödan. Att optimera startskrotlängden är följaktligen positivt både för miljön och rent ekonomiskt. Under varmvalsningen kan defekten kantbrakor, det vill säga sprickor vid kanterna, uppstå. Trots att en bit av det första gjutna slabet skärs av, så är det första slabet fortfarande mest utsatt för kantbrakor. Detta tros bero på nedsatt varmduktilitet i det första gjutna materialet. Syftet med detta projekt är att optimera längden på startskrotet för att spara så mycket användbart material som möjligt. Varmduktiliteten undersöktes genom drag- och bockprovning. Dragproven indikerar hög varmduktilitet för de undersökta proven. Areakontraktionen, som är ett mått på varmduktiliteten, är över 70 % för alla undersökta prov. Medelareakontraktionen, när man bortser från eventuella skillnader mellan chargerna, visar att prov från en meter generellt har något lägre varmduktilitet än de övriga proven. Det är endast små skillnader som uppfattas. Ingen skillnad kan ses mellan kant- och mittenprov när man enbart tittar på dragprovsresultaten. Bockproven sprack inte trots att maximal last användes och att testtemperaturen var 750 °C. Detta tyder också på hög varmduktilitet. Genom att skapa anvisningar kunde man få bockproven att spricka och det visade sig att kantprov och prov från en meter sprack mest. Inga kantbrakor hade uppstått på de första gjutna slabsen under varmvalsningen av försökschargerna.

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Al-Helal, Kawther. "New approaches to casting hypereutectic Al-Si alloys to achieve simultaneous refinement of primary silicon and modification of eutectic silicon." Thesis, Brunel University, 2013. http://bura.brunel.ac.uk/handle/2438/8167.

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Hypereutectic Al-Si alloys are of increasing interest for applications that require a combination of light weight and high wear resistance, such as pistons, liner-less engine blocks and pumps. The wear resistance of this class of alloys is due to the presence of hard primary Si particles formed during casting. The objective of this work was to develop one or more methods of refining primary silicon in cast hypereutectic Al-Si alloys to compete with the conventional process of adding phosphorous and to achieve the simultaneous modification of silicon in the Al-Si eutectic. A robust sampling/casting technique was developed to minimise macro-segregation of primary silicon during solidification of hypereutectic Al-Si alloys by using water cooled steel mould with cooling rate in excess of 15 K/s. The morphology of silicon phases was found to change with increasing melt temperature and cooling rate. The high cooling rate and superheat temperature produces a good distribution of polyhedral primary silicon particles in a refined lamellar eutectic matrix in solidification of commercial purity Al-Si alloys. Removing Ca by fluxing with K2SiF6 prior to casting can improve the refinement and modification effect of Mg and Sb respectively. Effects of various inoculants were studied. Microstructural analysis showed that Mg and ZnS refined primary Si whereas MgO, CaO and Na2S coarsened the primary Si together with a modification effect on the eutectic Si. Adding Zn had no effect on morphology of Si phases. Refinement of both primary and eutectic silicon phases was observed for the Al-15Si alloy with Mg content ≤ 0.3 wt%. P-doped γ-Al2O3 was found to be a potent substrate to nucleate primary silicon whilst good modification of the eutectic matrix is retained during solidification of hypereutectic Al-Si alloys. On using P-doped γ-Al2O3 could be a perfect and clean source of P without additional impurities. A new solid-liquid duplex casting process was devised to achieve simultaneous refinement and modification of Si phases in hypereutectic Al-Si alloys with improvement in mechanical properties. The static mechanical properties of Al-Si produced by the solid-liquid duplex casting process are significantly better than conventionally cast untreated Al-Si and slightly better than conventionally cast Al-Si treated with P and/or Sr. A novel Al-ZnS master alloy was developed by in situ reaction of Zn and Na2S in the Al melt. The results from this study leave little doubt that this novel Al-ZnS master alloy is a promising refiner in solidification of hypereutectic Al-Si alloys. It refines primary silicon to the same extent as that achieved by adding P via Cu-P following the same refinement mechanism.

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Lu, Yu-Chiao. "Design of Bridgman unidirectional solidification furnace." Thesis, KTH, Materialvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-261191.

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The thesis work consists of two parts. First, the development of two-dimensional numerical models of a Bridgman unidirectional solidification furnace, and second, the construction work of the furnace at KTH. The aim is to build a Bridgman furnace which is capable of close control over temperature gradient and growth rate such that the solidification structures of a duplex stainless steel (SAF2507) could be replicated at a laboratory scale for different cooling rates.Two numerical models of Bridgman furnace are created using COMSOL Multiphysics. The models are used as predictive tools to simulate the locations of solidification front and the temperature gradients at the solidification fronts, which are parameters difficult to access during experiments. Different hot zone temperatures of the furnace (1500~1550 °C) and different sample pulling rates (0.5~10 mm/s) are studied in simulations. The major finding from modeled results is that the temperature gradient of the sample at the solidification fronts range from 5 ~ 17 K/mm, which are lower than the furnace temperature gradient of ~50 K/mm. The corresponding steady-state cooling rates range between 5 ~ 85 K/s. The next step is to validate the models with experimental temperature profiles of the furnace, and decide whether the furnace design should be modified to achieve the cooling rates of interests.
Examensarbetet består av två delar. Först utvecklingen av tvådimensionella numeriska modeller av en Bridgman enkelriktad stelningsugn, och för det andra konstruktionsarbetet för ugnen vid KTH. Syftet är att bygga en Bridgman-ugn som har förmåga att kontrollera temperaturgradienten och tillväxthastigheten så att stelningsstrukturerna i ett duplex-rostfritt stål (SAF2507) skulle kunna replikeras i laboratorieskala för olika kylningshastigheter. Två numeriska modeller av Bridgman-ugnen skapas med COMSOL Multiphysics. Modellerna används som prediktiva verktyg för att simulera placeringen av stelningsfronten och temperaturgradienterna vid stelningsfronterna, vilket är parametrar som är svåra att komma åt under experiment. Olika varmzonstemperaturer i ugnen (1500~1550 °C) och olika provdragningshastigheter (0.5~10 mm/s) studeras i simuleringar. Det viktigaste fyndet från modellerade resultat är att provets temperaturgradient vid stelningsfronterna sträcker sig från 5 ~17 K/mm, vilket är lägre än ugns temperaturgradient på ~ 50 K/mm. Motsvarande stabilitetskylningshastigheter varierar mellan 5 ~ 85 K/s. Nästa steg är att validera modellerna med experimentella temperaturprofiler för ugnen och bestämma om ugnsutformningen ska modifieras för att uppnå intressens kylningshastigheter.

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Petzold, Lukas. "Gefüge-Eigenschaftsrelationen dünnwandig erstarrter Eisenlegierungen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2011. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-67668.

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Gegenstand der Arbeit ist die Untersuchung der Gefügebildung dünnwandig erstarrter Eisenlegierungen und deren Auswirkung auf die mechanischen Eigenschaften. Die Arbeit ist in zwei Teile untergliedert. Im experimentellen Teil wurden Stahlgusslegierungen unter Variation ihrer Zusammensetzung erschmolzen und in Quarzsandformen vergossen. Das erhaltene Probenmaterial wurde im Gusszustand sowie nach optional angewendeten Wärmebehandlungen untersucht. Die Abhängigkeiten zwischen chemischer Zusammensetzung, Gefügeausbildung und mechanischen Eigenschaften wurden quantitativ dargelegt. Der Modellierungsteil enthält die Ergebnisse der Simulation des Gieß- und Erstarrungsprozesses eines ausgewählten Stahlgusswerkstoffs. Zur Durchführung der Simulation kamen kommerziell verfügbare Softwarepakete zum Einsatz. Die Ergebnisse wurden mit experimentell ermittelten Daten verglichen und die Adäquatheit der Simulation beurteilt. Die Anwendbarkeit der genutzten Simulationsmethoden auf den Bereich dünnwandiger Stahlgussteile wurde aufgezeigt.

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Valenta, Pavel. "Vliv chemického složení oceli na strukturu a vlastnosti korozivzdorných ocelí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230532.

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The thesis is focused on high-alloy austenitic and austenitic-ferritic (duplex) steel. The theoretical part includes research about high-alloy steels and basic introduction to this issue. In the practical part of the test there were casted refractory austenitic steel 30CH3N17G2L, duplex stainless steel 1.4462, low carbon steel and high carbon steel. On the castings of austenitic steel were made mechanical and technological tests. There were evaluated the effects of different casting temperature and casting wall thickness to the microstructures and macrostructures of steel, tensile strength and charpy impact tests. The technological tests compared technological properties of these steels.

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Kaněra, Miloš. "Výroba odlitků z austeniticko-feritických hyperduplexních korozivzdorných ocelích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445174.

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The thesis deals with hyper duplex stainless austenitic-ferritic steels and their mechanical and castability properties. The evaluation of resistance to pitting corrosion is divided by PRE values. Steels with a PRE value higher than 48 belong to the group of hyper duplex steels. The theoretical part contains an introduction to the chemical composition, structure and properties of these steels. The practical part is focused on the conditions of tendency to crack castings during solidification and cooling. Furthermore, there is evaluated influence of intermetallic phases on mechanical properties.

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Mestrallet, Aurore. "Thermodynamique de nouvelles solutions d'aciers de 3ème génération à structure duplex." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI075/document.

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Le développement d’une troisième génération d’aciers Fe-Mn-Al-C à structure duplex, pour des teneurs en Mn et Al inférieures à 8 %mass, pourrait être une réponse prometteuse aux objectifs d’allègement de 20% des véhicules automobiles, tout en garantissant des propriétés de haute résistance mécanique et haute formabilité.Le choix des nuances et l’optimisation des conditions d’élaboration nécessitent de prévoir en particulier les compositions et proportions des phases existantes en fonction de la route métallurgique. Une base de données thermodynamiques fiable et précise est donc requise. Cependant les données de la littérature sur le système quaternaire Fe-Mn-Al-C, dans les domaines de composition envisagés, sont limitées.Ce mémoire est consacré à l’établissement des équilibres de phases ferrite-α, austénite-γ et carbure-κ (Fe,Mn)3AlC entre 700 et 1000°C par une approche couplée d’expériences ciblées et de modélisation thermodynamique. Pour appuyer l’évolution expérimentale des fractions de phases et des compositions, une modélisation cinétique (DICTRA) est proposée. La cinétique de formation de l’austénite en fonction de la composition de l’alliage et de la température de maintien dans le domaine intercritique a été caractérisée. Les phases en équilibre, caractérisées par DRX, MEB, microsonde, sont représentées sous forme de conodes α/γ, γ/κ, α/γ/κ, ce qui permet de définir les domaines de stabilité de l’austénite et du carbure κ. Ces données expérimentales sont utilisées pour affiner la description thermodynamique du système quaternaire mais il est nécessaire de réviser la modélisation du carbure κ
A third generation of Fe-Mn-Al-C steels with a duplex structure, for Mn and Al contents less than 8%mass, could be a promising response to the 20% weight lightening of automotive vehicles, by keeping a high strength and a high formability.The knowledge of the corresponding quaternary phase diagram serves as a roadmap for the choice of compositions and the optimization of elaboration conditions. A reliable and precise thermodynamic database is therefore required. However, the literature data on the Fe-Mn-Al-C quaternary system in the targeted domains are limited.This study is devoted to the establishment of phase equilibria involving ferrite-α, austenite-γ and carbide-κ (Fe,Mn)3AlC between 700 and 1000°C by a coupled approach of experiments and thermodynamic modeling. A kinetic model (DICTRA) is proposed to support the experimental evolution of phase fraction and composition. The kinetics of austenite formation as a function of the alloy composition and of the maintaining temperature in the intercritical domain have been calculated. The phases in equilibrium, characterized by XRD, SEM, EPMA, are represented as α/γ, γ/κ, α/γ/κ tie-lines in order to specify the stability fields of γ and κ. These data are used to refine the thermodynamic description of the quaternary system but it is necessary to revise the modeling of κ carbide

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Santos, Josemar dos. "Controle de nível em um processo de lingotamento contínuo de tiras-rolos duplos." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-08062017-101230/.

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O presente trabalho tem como objetivo explorar o uso de técnicas de controle avançado na indústria metalúrgica. O nível de aço é uma das variáveis mais críticas para a produção de chapas ou tiras de alta qualidade no processo de lingotamento contínuo de tiras baseados em rolos duplos. Para melhorar a qualidade da espessura das tiras utiliza-se em tanque intermediário submerso na piscina formada entre os rolos duplos. São propostas três técnicas e controle de \"fuzzy\" via modelos Mamdani e Takagi-Sugeno. O modelo Mamdani é desenvolvido com base no conhecimento experimental do processo. O modelo Takagi-Sugeno utiliza uma abordagem mais sistêmica para a resolução do problema, utilizando modelos locais (linearizados) da planta não-linear que descreve o nível e escoamento do aço no tanque intermediário. Os componentes do sistema de controle empregados são discutidos e especificados. São apresentados resultados de simulação utilizando os parâmetros reais de uma planta de lingotamento contínuo instalada no IPT São Paulo. As simulações realizadas mostram que as técnicas de controle sugeridas atendem as restrições da planta e são viáveis de implementação.
This work explores the use of advanced control techniques in the metallurgical industry. The molten steel level is one of the most critical to the production of high quality steel strips in strip casting process. The strip thickness uniformity can be improved using an intermediary tundish submerse into the pool formed between the two rotating rolls. Three control techniques are considered to control the intermediary tundish molten steel level: PID, feedback linearization and fuzzy logic via Mamdani and Takagi-Sugeno models. The Mamdani model is developed with base in the experimental knowledge of the process. The Takagi-Sugeno model uses a more systematic approach for the solution of the control problem using local models for the non-linear plant that describes the level and flow of the steel in the intermediary tundish. The components of the level control system are discussed and specified. Simulation results are presented considering the real system parameters of a strip casting plant installed at IPT São Paulo. The simulation results obtained show that the control techniques suggested satisfies the constraints on the plant and can be considered for implementation.

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Nascimento, Renato Rosa do. "Controle não linear aplicado a processos de lingotamento contínuo de tiras." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-05062017-090446/.

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O presente trabalho tem como objetivo explorar o uso de técnicas de controle avançados na indústria siderúrgica. Propõe-se uma estratégia de controle do nível do aço da piscina formada entre os rolos de um sistema lingotamento contínuo de tiras (LCT) utilizando a tecnologia twin-roll (rolos duplos). O processo LCT rolos duplos tem por finalidade a produção de tiras solidificadas de espessura constante sob uma força de separação entre os rolos também constante. O nível de aço bem como a força de separação são as variáveis mais críticas para a produção de tiras de aço de alta qualidade. O nível pode ser controlado usando a entrada de aço ou a velocidade de laminação. Entretanto, a velocidade de laminação é usualmente utilizada para regular a força de separação entre os rolos. A estratégia de controle proposta inclui a incorporação de um tundish intermediário submerso na piscina. O controle do nível é então feito a partir da saída de aço do tundish intermediário. Consideramos as técnicas de controle linearizante por realimentação de estado e de controle fuzzy usando ambos os modelos Takagi-Sugeno (T-S) e Mamdani. Resultados de simulação são apresentados para uma planta instalada no Instituto de Pesquisa Tecnológica (IPT) de São Paulo, divisão de metalurgia (DIMET).
The aim of this work is to explore the use of advanced control techniques in the metallurgical industry. A control strategy to regulate the molten steellevel of a strip-casting process is proposed. The process produces a solidified strip of constant thickness given by the roll gap under a constant roll separation force. Along with the molten steel level the rool separation force are the most criticaI process variables. The molten steel level may be controlled using the tundish output flow or the casting speed. However, the casting speed is usually used to control the roll force separation. In the control strategy proposed it is incorporated an intermediary tundish submerse into the pool between the rotating rolls to improve the strip thickness uniformity. The molten steel level is thus controlled by the intermediary tundish output flow. Conventional PI, feedback linearizing plus a fuzzy control term and a fuzzy controller in a cascade configuration are considered. Simulation results are presented considering the real system parameters of a plant installed at the Instituto de Pesquisa Tecnológica (IPT) de São Paulo, Divisão de Metalurgia (DIMET).

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Book chapters on the topic "Duplex casting"

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Puhakka, Bob. "Premium Quality Super Duplex Stainless Steel Castings without Secondary Refining." In Shape Casting, 79–85. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062050.ch10.

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Xiangru, Chen, Sun Qingqing, Ao Lu, Zhong Honggang, Zheng Hongxing, Li Zhijun, and Zhai Qijie. "Experimental Simulation on the Continuous Casting Solidified Structure of S32205 Duplex Stainless Steel." In Supplemental Proceedings, 577–84. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062173.ch72.

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Sun, Qingqing, Honggang Zhong, Xiangru Chen, and Qijie Zhai. "Continuous Casting Simulation of 2304 Duplex Stainless Steel Via Horizontal Directional Solidification Technique." In EPD Congress 2012, 17–23. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118359341.ch2.

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Sousa, R. O., I. Felde, P. J. Ferreira, A. M. Deus, and L. M. M. Ribeiro. "Inverse Methodology for Estimating the Heat Transfer Coefficient in a Duplex Stainless Steel Casting." In Advanced Structured Materials, 59–69. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-02257-0_5.

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Lee, S. M., S. Yang, S. T. Kim, Y. S. Park, and B. M. Moon. "Centrifugal Casting Practice and Microstructure and Mechanical Properties of a 2205 Duplex Stainless Steel." In Materials Science Forum, 2527–32. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-960-1.2527.

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Conference papers on the topic "Duplex casting"

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Yao, Yuhong, Jianfeng Wei, Jiangnan Liu, Zhengpin Wang, and Yu Wang. "Thermal Ageing Embrittlement of Casting Duplex Stainless Steels for Nuclear Power Plant." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29982.

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Cast duplex stainless steels (CSS) used for PWR pipes are degraded due to thermal ageing embrittlement during long-term service at 288 °C to 327 °C. Z3CN20-09M Cast duplex Stainless Steels (CSS) made in France for domestic nuclear power plants were thermally aged at 400 °C for 100 h, 300 h, 1000 h, 3000 h and 10000 h. The tensile properties and the impact properties at different thermal aging duration were measured and the effects of the thermal aging time on the microscopic structures and substructures of Z3CN20-09M were respectively investigated by optical microscopy and transmission electron microscopy. The results showed that the tensile strengths of Z3CN20-09M CSS increased gradually with the increment of the thermal ageing time, whereas the impact properties decreased with the prolonging of the thermal ageing time. After long thermal ageing time the dislocation configurations were greatly changed in austenite, and there were precipitates along the austenite-ferrite interface. Moreover, the iron-rich α phase and the chromium-rich α phase precipitated in ferrite aged for 10000h by nucleation and growth rather than the spinodal decomposition. All of above revealed that Z3CN20-09M CSS became brittle during thermal ageing.

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Anghel, Gelu Dragos, Narayana Swami Nallamothu, Harendra Singh, Faris Ragheb Kamal, and Oussama Halim Takieddine. "Casting Requirements of Super Duplex Stainless Steel Products – Lesson Learned from a Failure Case Perspective." In Abu Dhabi International Petroleum Exhibition & Conference. Society of Petroleum Engineers, 2020. http://dx.doi.org/10.2118/203104-ms.

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Le Delliou, Patrick, Sébastien Saillet, and Georges Bezdikian. "Large EDF Tests on Aged Cast Duplex Stainless Steel Components: Part II — Full Scale Tests." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45961.

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Thermal ageing of cast duplex stainless steel primary loops components (elbows, pump casings and branch connections) is a concern for long-term operation of EDF nuclear power plants. The thermal ageing embrittlement results from the microstructural evolution of the ferrite phase (spinodal decomposition), and can reduce the fracture toughness properties of the steel. In addition, it is necessary to consider manufacturing quality and the possible occurrence of casting defects such as shrinkage cavities. In a context of life extension, it is important to assess the safety margins to crack initiation and crack propagation instability. This paper presents two tests conducted by EDF on aged cast duplex stainless steel NPP components, respectively on a full-scale elbow and a branch connection. The main characteristics of the tests are recalled, the results are presented, and finally, the lessons drawn are summarized. These tests and their detailed analyses contribute to validate and justify the methodology used by EDF in the integrity assessment of in-service cast duplex stainless steel components.

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Le Delliou, Patrick, Sébastien Saillet, and Georges Bezdikian. "Large EDF Tests on Aged Cast Duplex Stainless Steel Components: Part I — Reduced Scale Tests." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45960.

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Thermal ageing of cast duplex stainless steel primary loops components (elbows, pump casings and branch connections) is a concern for long-term operation of EDF nuclear power plants. The thermal ageing embrittlement results from the micro-structural evolution of the ferrite phase (spinodal decomposition), and can reduce the fracture toughness properties of the steel. In addition, it is necessary to consider manufacturing quality and the possible occurrence of casting defects such as shrinkage cavities. In a context of life extension, it is important to assess the safety margins to crack initiation and crack propagation instability. This paper presents several tests conducted by EDF on aged cast duplex stainless steel NPP components, respectively on two-third scale elbows and welded mock-ups. The main characteristics of the tests are recalled, the results are presented, and finally, the lessons drawn are summarized. These tests and their detailed analyses contribute to validate and justify the methodology used by EDF in the integrity assessment of in-service cast duplex stainless steel components.

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Le Delliou, Patrick, and Sébastien Saillet. "Recent Improvements in Toughness Prediction of Cast Duplex Stainless Steel Components." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93114.

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Abstract Thermal ageing of cast duplex stainless steel components is a concern for long-term operation of EDF nuclear power plants. The thermal ageing embrittlement results from the microstructural evolution of the ferrite phase (spinodal decomposition), and can reduce the fracture toughness properties of the steel. In addition, it is necessary to consider manufacturing quality and the possible occurrence of casting defects such as shrinkage cavities. In a context of life extension, it is important to assess the safety margins to crack initiation and crack propagation instability. One major input of the assessment methodology is the toughness value of the thermally aged component. Recent work conducted at EDF R&D to improve the accuracy and the conservativeness of the toughness prediction has led to the development of new prediction formulae. The toughness prediction relies on three steps: • estimation of the Charpy impact test values at 20 and 320°C using the chemical composition of the steel and the aging conditions (temperature and duration), • estimation of the J-R curve at 20 and 320°C - defined by a power law J = CΔan - thanks to correlations between n and C and the Charpy impact test values, • estimation of the J-R curve at any temperature between 20 and 320°C thanks to interpolation formulae. The paper presents the experimental data used to develop the formulae, the formulae themselves and some elements of validation.

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Terek, Pal. "Cast Alloy Soldering Tendency and Corrosion Resistance of Duplex PVD Coatings for Application on Die Casting Tools for Aluminum Alloys Processing." In Annual Technical Conference Proceedings. Society of Vacuum Coaters, 2018. http://dx.doi.org/10.14332/svc17.proc.42832.

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Le Delliou, Patrick, and Sébastien Saillet. "Integrity and Life Assessment of Cast Duplex Stainless Steel Elbows of EDF PWR Main Coolant Piping." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45231.

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Thermal ageing of cast duplex stainless steel elbows is a concern for long-term operation of EDF nuclear power plants. The thermal ageing embrittlement results from the micro-structural evolution of the ferrite phase (spinodal decomposition), and can reduce the fracture toughness properties of the steel. In addition, it is necessary to consider manufacturing quality and the possible occurrence of casting defects such as shrinkage cavities. In a context of life extension, it is important to assess the safety margins to crack initiation and crack propagation instability. This paper reports the present integrity and life assessment methodologies as carried out by EDF. The approach is based on the in-service inspection and surveillance RSE-M Code and on French regulation requirements for NPPs in operation. This work is supported by an extensive R&D programme on one hand and on field experience analysis on the other hand. The paper details the three main topics of the life assessment methodology: - estimation of the fracture toughness of the steel with predictive formulae using the chemical composition and ageing conditions, - definition of a reference crack size based on an inventory of the manufacturing quality of the elbows, - fracture mechanics evaluation based on the J parameter, computed either by an engineering estimation method or by a finite element analysis. The calculated J parameter is then compared with the estimated fracture toughness of the material. Partial safety coefficients are included in the calculation process as required by the RSE-M Code.

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Le Delliou, Patrick, Georges Bezdikian, Pascal Ould, and Nathalie Safa. "Full-Scale Test on an Aged Cast Duplex Stainless Steel Lateral Connection: Results and Analysis." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-94005.

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Some components (elbows, pump casings and lateral connections) of the primary loop of French PWRs are made of static cast duplex stainless steels. This kind of steel may age even at relatively low temperatures (in the temperature range of PWR service conditions), depending on the material composition. An important consequence of this ageing process is the decrease in the ductility and fracture toughness of the material. It is feared that an embrittlement, associated with the occurrence of casting defects, may increase the risk of failure. Therefore, an extensive programme has been launched by EDF in co-operation with Framatome ANP, in order to determine acceptability criteria for operating cast stainless steel components. This programme relies on a large R&D effort, involving metallurgical studies, large-scale experiments, development of specific finite element tools and J-estimation schemes, and research of methods to assess the ageing state of in-service components. This paper presents the main characteristics and results of an experiment conducted on an aged cast 45 degree lateral connection. This connection contained a machined notch at the acute corner and was tested under internal pressure. The chemical composition was chosen to obtain a fast thermal ageing and low fracture toughness properties. During the test, the defect initiated and grew subsequently by ductile tearing. The test showed that it was possible to obtain a significant amount of stable crack growth (about 2.5 mm) despite the low toughness properties of the aged material. The pressure reached at the end of the test was about twice the in-service pressure. A detailed fracture mechanics analysis, based on finite element calculations, was performed. These calculations fairly simulated the overall behaviour of the tested structure, gave a conservative prediction of the crack initiation pressure and well predicted the crack size associated with the maximum pressure. These tests and their detailed analyses contribute to validate and justify the methodology used in the integrity assessment of in-service cast duplex stainless steel components.

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Le Delliou, Patrick, Franc¸ois Curtit, Christophe Sonnefraud, and Claude Page`s. "Bending Test on an Aged Cast Duplex Stainless Steel Pipe Containing a Crack in the Heat Affected Zone: Results and Analysis." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25952.

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Some components (elbows, pump casings and lateral connections) of the primary loop of French PWRs are made of static cast duplex stainless steels. This kind of steel may age even at relatively low temperatures (in the temperature range of PWR service conditions), depending on the material composition. An important consequence of this ageing process is the decrease in the ductility and fracture toughness of the material. It is feared that an embrittlement, associated with the occurrence of casting defects, may increase the risk of failure. In order to build the primary loops, these components are welded and the behaviour of the weld heat affected zone (HAZ) is not well known. So a specific program was launched on this topic, involving metallurgical studies, fracture mechanics tests, medium-scale experiments, and finite element analyses. This paper presents the main characteristics and results of an experiment conducted on a 6″ aged cast pipe. This pipe contained a machined notch in the heat affected zone of a butt-weld and was tested under four-point bending at 300°C. The chemical composition of the steel was chosen to obtain a fast thermal ageing and low fracture toughness properties. During the test, the defect initiated and grew subsequently by ductile tearing. The test showed that it was possible to obtain a significant amount of stable crack growth (about 4 mm) despite the low toughness properties of the aged material. A detailed fracture mechanics analysis, based on finite element calculations, was performed. These calculations fairly simulated the overall behaviour of the tested structure, gave a conservative prediction of the crack initiation pressure and well predicted the crack size associated with the maximum applied bending moment. These tests and their detailed analyses contribute to validate and justify the methodology used in the integrity assessment of in-service cast duplex stainless steel components.

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Ligneau, N., C. Page`s, M. Akamatsu, C. Pokor, and V. Calonne-Chatelee. "Integrity and Life Assessment of Cast Duplex Stainless Steel Elbows Used in the Primary Loops of PWRs." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77731.

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Type CF8M cast duplex stainless steels used in the primary loop elbows of PWRs can be affected by thermal aging embrittlement at service temperature, which is around 300°C. This mechanism, resulting from the microstructural evolution of the ferrite, can reduce their fracture toughness properties. In addition, it is necessary to consider manufacturing quality and the possible occurrence of casting defects, such as shrinkage cavities. In a context of life extension, it is important to assess the margins for crack initiation and crack propagation instability. This paper reports the present integrity and life expectancy assessment methodologies as carried out by EDF. The French approach is based on engineering code RSE-M guidelines and French regulation requirements on NPPs in operation. This work is supported by an extensive R&D program on one hand and on field experience analysis on the other hand. It is shown how R&D and engineering tools complement each other. This paper details the three main topics of the life assessment methodology: - Fracture toughness estimates are made with predictive formulae based on chemical composition and aging conditions. These formulae are supported by a data base which is regularly up-dated with new measurements. - An inventory of manufacturing quality is drawn up and the most severe defects are characterized regarding mechanical concerns. - Fracture mechanics analyses are performed using both engineering simplified methods and classical finite element analysis. The calculated J parameter is then compared with the estimated fracture toughness of the material. Margin coefficients are included in the calculation process as required by the French regulation and code. Finally, this evaluation enables the utility to: - Identify the sensitive parts regarding the aging of cast components, - Perform a monitoring and a maintenance program as necessary.

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Reports on the topic "Duplex casting"

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LESHIKAR, G. A. Metallurgical study of duplex stainless steel CD4Mcu Casting Material for Purex type nozzles. Office of Scientific and Technical Information (OSTI), May 2003. http://dx.doi.org/10.2172/811991.

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Lundin, C. D., G. Zhou, and W. Ruprecht. Ferrite Measurement in Austenitic and Duplex Stainless Steel Castings - Final Report. Office of Scientific and Technical Information (OSTI), August 1999. http://dx.doi.org/10.2172/14577.

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Lundin, C. D., G. Zhou, and W. Ruprecht. Ferrite Measurement in Austenitic and Duplex Stainless Steel Castings - Literature Review. Office of Scientific and Technical Information (OSTI), August 1999. http://dx.doi.org/10.2172/14580.

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