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Статті в журналах з теми "Coulé sous pression":
BLATTEAU, J. É., C. PÉNY, F. LECLERCQ, C. ROBINET, E. GEMPP, P. LOUGE, S. DE MAISTRE, J. M. PONTIER, P. CONSTANTIN, and M. HUGON. "Techniques actuelles de sauvetage des sous-marins. Contexte de mise en oeuvre du Nato Submarine Rescue System." Médecine et Armées Vol. 43 No. 1, Volume 43, Numéro 1 (February 1, 2015): 83–94. http://dx.doi.org/10.17184/eac.6862.
Frances, M., M. Vilasi, M. Mansour-Gabr, J. Steinmetz, and P. Steinmetz. "Etude de l'oxydation à 850°C de l'alliage NiCoCrAl(Y)Ta coulé et projeté au chalumeau plasma sous pression réduite." Materials Science and Engineering 88 (April 1987): 89–96. http://dx.doi.org/10.1016/0025-5416(87)90071-1.
Roux, R., Ph Dor, J. P. Latrasse, D. Pitis, and J. M. Jolivet. "La coulée sous pression à brames, une alternative à la coulée continue dans le cadre des aciers spéciaux." Revue de Métallurgie 93, no. 7-8 (July 1996): 981–87. http://dx.doi.org/10.1051/metal/199693070981.
Saleil, Jean, Marc Mantel, and Jean Le Coze. "La production des aciers inoxydables: Histoire de son développement et des procédés de fabrication. Partie II. Évolutions de l’élaboration des aciers inoxydables au four électrique à arc. La tentation de la fonte au chrome et la production d’aciers inoxydables dans l’usine intégrée." Matériaux & Techniques 108, no. 1 (2020): 104. http://dx.doi.org/10.1051/mattech/2020017.
Cresta, G., L. Gotta, G. Parodi, A. Poli, and A. Pozzi. "Démarrage de la machine de coulée sous pression contrôlée de brames pour la production de tôles fortes à l'usine de Campi de la Nuova Italsider." Revue de Métallurgie 83, no. 6 (June 1986): 511–22. http://dx.doi.org/10.1051/metal/198683060511.
Yu, Jian Bo, Zhong Ming Ren, B. Q. Wang, and Y. W. Zhang. "Effect of Sintering Systems and Colloidal Silica Sols on the Mechanical Properties of Oriented Silica-Based Ceramic Core Materials." Advanced Materials Research 177 (December 2010): 418–20. http://dx.doi.org/10.4028/www.scientific.net/amr.177.418.
Reisser, H., C. Pagotto, T. Forestier, and T. Trotouin. "Actipol 4Gi : un outil au service de la recherche des émetteurs de micropolluants sur les territoires." Techniques Sciences Méthodes, no. 7-8 (July 2019): 53–66. http://dx.doi.org/10.1051/tsm/201907053.
Gérardin, Pauline, Clément Fritsch, Sylvain Cosgun, Maree Brennan, Stéphane Dumarçay, Francis Colin, and Philippe Gérardin. "Effet de la hauteur de prélèvement sur la composition quantitative et qualitative des polyphénols de l’écorce d’Abies alba Mill." Revue forestière française 72, no. 5 (October 31, 2020): 411–23. http://dx.doi.org/10.20870/revforfr.2020.5338.
Hétu, Bernard, Guillaume Fortin, Jérôme Dubé, Dominic Boucher, Thomas Buffin-Bélanger, and Jean-Pierre Gagnon. "Les conditions nivologiques et hydro-météorologiques propices au déclenchement des coulées de slush : L’exemple du Québec (Canada)." Climatologie 13 (2016): 71–95. http://dx.doi.org/10.4267/climatologie.1212.
Siradji, Abdoulaye Abdou, Inoussa Maman Maarouhi, Mansour Mahamane, Assoumane Guero Ousseini, Hamani Noma Abdoul Latif, Douma Soumana, Bakasso Yacoubou, and Mahamane Ali. "Dynamique spatio-temporelle des écosystèmes de la Réserve de Biosphère de Gadabédji dans la zone Nord Sahélienne au centre du Niger." European Scientific Journal, ESJ 20, no. 18 (June 30, 2024): 310. http://dx.doi.org/10.19044/esj.2024.v20n18p310.
Дисертації з теми "Coulé sous pression":
Bouayad, Aboubakr. "Etude experimentale et modélisation numérique des mécanismes physico-chimiques et des comportements thermomécaniques au niveau de l'interface alliage coulé / insert mécanique." Paris, ENSAM, 2003. http://www.theses.fr/2003ENAM0012.
Landron, Thomas. "effets des gradients de porosité et de contrainte sur le comportement en fatigue à grand nombre de cycles de l’alliage d’aluminium AlSi9Cu3 coulé sous pression." Electronic Thesis or Diss., Paris, HESAM, 2023. http://www.theses.fr/2023HESAE091.
This research deals with the effect of porosity and stress gradients on the high-cycle fatigue behavior (HCF) of the high-pressure die-cast (HPDC) aluminum alloy AlSi9Cu3 used by the automotive industry. The components produced by HPDC are characterized by a high level of porosity compared to other casting processes. In addition, the porosity or defect distribution within a component is highly heterogeneous and the existence of a porosity gradient between the surface and the in-bulk material is notable. Defects of different nature and size are present, including defects formed by complex three-dimensional pore networks.To study the effects of the porosity and stress gradients on the HCF behavior, a test methodology based on reducing the thickness of as-cast specimens by machining was developed. Four geometries machined from the same as-cast specimens were tested in HCF under different loading modes: plane bending and tension-compression with a load ratio R=-1. The analysis of the fatigue failure surfaces, combined with fatigue results in the form of Wöhler curves shows that fatigue behavior is controlled by the interaction between the porosity gradient and the stress gradient. The position of the crack initiation site (surface or in-bulk), the nature of the critical defects, as well as the fatigue strength are entirely determined by these two gradients.The effect of defects on the fatigue behavior was analyzed using an approach based on the Kitagawa-Takahashi diagram and the stress intensity factor threshold (Kth). This analysis shows that the fatigue strength of the material is controlled by the size of the defects in terms of the Murakami parameter (√area). The wide range of defect size and the variety of defect types makes it possible to characterize the behavior of the material in both the short crack and long crack regimes. It is observed that the position of the crack initiation site (surface or in-bulk) has only a small effect on the fatigue behavior. Thanks to a comparison between the studied alloy and other gravity-cast aluminum alloys, it is shown that both the fatigue strength and the crack propagation behavior, is partly controlled by (a) the microstructural characteristics of alloys (grain size and secondary dendrite arm spacing (SDAS)) and by (b) the monotonic and cyclic mechanical behavior of the materials.The complexity of the defect distribution (type, size and spatial distribution) complicates the characterization and modeling of the kinetics of crack propagation and their interactions with defects. To investigate this, in-situ image correlation was used to monitor crack growth during fatigue tests, with the aim of observing the crack interaction with natural defects, in bending at R=-1. The analysis of the crack growth kinetics and the fatigue failure surfaces reveals a strong interaction between fatigue cracks and defects. These interactions cause rapid crack accelerations, which drastically reduce the fatigue life. A HCF crack propagation model is proposed using an averaging approach with the Paris law. The coefficients are adjusted using the crack monitoring tests. The comparison between the simulated Wöhler curves at initial iso-defect-size and the experimental Wöhler curves shows that the propagation approach is not sufficient to account for all the stages leading to fatigue failure. It is clearly highlighted that the initiation phase must be taken into account and that the fatigue damage mechanisms, associated with defects comprised of complex three-dimensional pore networks, are extremely complex.Keywords: High cycle fatigue (HCF), microstructural heterogeneity, porosity gradient, stress gradient, aluminum alloy, high-pressure die-casting, porosity networks, fatigue life, crack – defect interaction
Benameur, Fouad. "Modélisation thermo-mécanique de la coulée sous pression en fonderie." Compiègne, 1996. http://www.theses.fr/1996COMPD885.
Hervieu, Olof. "Thixoformage par coulée sous pression : Application aux alliages d'aluminium et de magnésium." ENSMP, 1998. http://www.theses.fr/1998ENMP0801.
Arvieu, Corinne. "Influence de différents paramètres sur les caractéristiques mécaniques et structurales d'alliages cuivreux moulés sous pression." Compiègne, 1991. http://www.theses.fr/1991COMPD392.
Amat, Pascal. "Etude et optimisation d'un interface collé axisymétrique assurant la fermeture d'un réservoir composite sous pression et chargement thermique." Toulouse 3, 1996. http://www.theses.fr/1996TOU30027.
Tavakoli, Shahab. "Modélisation du cycle thermique des moules de fonderie sous pression." Thesis, Paris 10, 2014. http://www.theses.fr/2014PA100095.
Reducing the weight of vehicles, specially the powertrain Group, contributes to the reduction of the emissions. Today, in order to achieve this objective, the automobile parts conception (Housing gear box, Cylinder block) in lightweight materials such as aluminum and its alloys is increasing. For the mass production, aluminum alloys are formed by a foundry process called ‘’High Pressure Die Casting’’.This process uses the metal molds. Control the thermal behavior of the mold : Heating, intern cooling (by circuit) and extern cooling, is a key point to ensure castings quality and rate of production.In this thesis, the industrial process has been detailed since the mold closing and aluminum melting injection in the die, to the mold opening time and the part (Gearbox RENAULT) ejection. Then, the mold design details, different generation of the cooling systems and the parameters of each step of the manufacturing process taking into account the actual cooling system are presented. The actual cooling systems in the dies are positioned today in empirical way. The ultimate goal of this thesis is to provide the key elements for the cooling system conception from the thermal behavior point of view. For this one, a complete modeling of the phenomena has been realized and validated by 8 thermocouples and the cooling system position has been defined from the thermal equations. The thermal cycle of the die has been optimized and allowed us to reduce and homogenize the temperature fields on the die surface during the production. The rate of production, the castings quality and the lifetime of the die have been consequently increased
Juers, Caroline. "Corrosion et traitement de surface d'alliages de magnésium utilisés pour des applications aéronautiques." Thesis, Nancy 1, 2008. http://www.theses.fr/2008NAN10107/document.
In the aeronautical industry, aluminium alloys are progressively replaced by magnesium alloys, so as to lighten planes and consequently decrease noise and pollution. Actually, with a density of one third lower than the one of aluminium, magnesium is the lightest structural metal. However, its high chemical reactivity limits its application field: in spite of good mechanical properties, the main drawback of magnesium alloys is their corrosion resistance, which is insufficiently known. At the moment, magnesium alloys enriched with aluminium (as AZ91D or AM50 ones) are among the most used. They are made of two main phases: alpha-phase and Mg17Al12 compound (ß-phase). These alloys can be synthesized of different ways. High pressure die casting and gravity die casting are among the most used processes. The first part of this work is a microstructural and electrochemical study of magnesium alloys enriched with aluminium and obtained with gravity or high pressure die castings. The aluminium content effect, as well as the surface state, were investigated. In bulk conditions, magnesium alloys show a passive behaviour. The higher the aluminium content is, the better the corrosion resistance is. But, for highest aluminium contents, an uncertain pitting phenomenon can also be induced, due to a local accumulation of ß-phase. In skin conditions, high pressure die casting alloys always show an active behaviour, and the higher the aluminium content is, the worse the corrosion resistance is, because of the formation of big areas of ß-phase near the alloy’s surface and due to the casting process itself. At least, the gravity die casting process induces a strong roughness which strongly decreases the magnesium alloys corrosion resistance in skin conditions. The second part of this work is a comparative study between the different chemical conversion coatings which are among the most used on magnesium alloys: phosphate-based and Ce(III)-based treatments are more corrosion resistant than chromate-based treatment. This last one is now forbidden because of the high toxicity of chromium (VI). In another hand, stannate-based treatment is the less protective one. This study was performed in the framework of the IDEA project (6th PCRD), in collaboration with a dozen of Israeli and European partners
Milhem, Luc. "Fonderie sous pression du cuivre : étude du procédé et caractérisation du matériau." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMIR14.
This research focuses on the study of high pressure die casting (HPDC) of copper. In order to improve the properties of die-cast copper, two main issues were investigated. In the first part, attention is paid to the influence of melting parameters and of addition of alloying elements in small amounts on the characteristics of the specimen produced. The second part discusses the influence of the foundry process itself on properties of die cast part, in particular by studying two parameters : the metal flow type during cavity filling, and the air entrapment
Outmani, Imane. "Caractérisation des variabilités Matériaux/ Process pour une convergence produit de fonderie par approche prédictive." Thesis, Paris, ENSAM, 2017. http://www.theses.fr/2017ENAM0007/document.
Secondary Al-Si alloys are widely used in automotive industry for engine blocks because they offer a considerable weight reduction whilst maintaining good mechanical properties. The ever-expanding internationalisation of production, with same stages of production processes spread across a number of countries to produce locally, causes however high variability in the casting products. The chemical composition of the same alloys and the working variables of the unchanged high-pressure die casting process (HPDC) may change for the same casting parts from one country to another, they can even sometimes vary from one manufacturing site to another within the same country. Designing for aluminium automotive components does call today for new deterministic design methods that are often achieved from European material and casting process databases, which can affect the properties of these parts in the case of a location outside Europe. Thus, it is important to adapt the design of die casting parts quickly and inexpensively by taking into account the material and process local constraints. In this work, a methodological approach which permits to predict mechanical properties as a function of material and process variability based on an experimental/ statistical study on the effect of the variability of the primary factors of alloying elements contents (Si, Cu and Mg) and HPDC process parameters (casting temperature and injection pressure) on mechanical properties of die cast aluminium alloys has been proposed. The microstructural features and the porosity level were also investigated and assessed. This approach has resulted in statistical design tool that will allow designers to make changes to the design of their casting and to industrialize them outside Europe
Книги з теми "Coulé sous pression":
Andresen, Bill. Die casting engineering: A hydraulic, thermal, and mechanical process. New York, NY: Marcel Dekker, 2005.
International Light Metals Technology Conference (4th 2009 Gold Coast, Qld., Australia). Light Metals Technology 2009: Selected peer reviewed papers from the 4th International Conference organized by the CAST CRC, on behalf of the Global Light Metals Alliance, held from 29 June -1st July 2009 on the Gold Coast, Queensland, Australia. Zurich, Switzerland: Trans Tech Publications, 2009.
Dieringa, Hajo, Karl Ulrich Kainer, and Norbert Hort. Light Metals Technology V. Trans Tech Publications, Limited, 2011.
Частини книг з теми "Coulé sous pression":
Martin, Alexander M. "Memory." In From the Holy Roman Empire to the Land of the Tsars, 291–311. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780192844378.003.0016.
Potter, Jane. "Putting Things in Their Right Places’:The War in Romance Novels." In Boys in Khaki, Girls in Print, 88–149. Oxford University PressOxford, 2005. http://dx.doi.org/10.1093/oso/9780199279869.003.0004.