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Articoli di riviste sul tema "Acier inoxydable super duplex"
Sauvage, M. "Réalisation de collecteurs pétroliers en acier inoxydable duplex 22-05". Matériaux & Techniques 84, n. 9-10 (1996): 3–10. http://dx.doi.org/10.1051/mattech/199684090003.
Testo completoSauvage, M. "Une conduite sous-marine 18” en acier inoxydable duplex 22-05". Matériaux & Techniques 85, n. 1-2 (1997): 25–35. http://dx.doi.org/10.1051/mattech/199785010025.
Testo completoAubin, V., P. Quaegebeur e S. Degallaix. "Évolution de la surface de plasticité sous chargement biaxial dans un acier inoxydable duplex". Journal de Physique IV (Proceedings) 12, n. 11 (dicembre 2002): 195–202. http://dx.doi.org/10.1051/jp4:20020493.
Testo completoEl Bartali, A., M. C. Marinelli, M. Balbi, V. Aubin, I. Alvarez-Armas e S. Degallaix-Moreuil. "Stade I d’endommagement par fatigue plastique oligocyclique (FPO) dans un acier inoxydable duplex (AID)". Matériaux & Techniques 100, n. 1 (2012): 69–78. http://dx.doi.org/10.1051/mattech/2012002.
Testo completoLopez, N. "VI - Mesure de la sensibilité à la CSC intergranulaire d’un acier inoxydable duplex à l’aide d’essais électrochimiques (technique EPR)". Matériaux & Techniques 83 (1995): 50–52. http://dx.doi.org/10.1051/mattech/199583120050s.
Testo completoTesi sul tema "Acier inoxydable super duplex"
Da, Silva Craidy Pedro. "Interactions Hydrogène-Microstructure-Propriétés Mécaniques dans les Composants en Acier Inoxydable Super Suplex". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI041.
Testo completoThe increasing demand for energy requires the exploration of oil and gas at deeper water locations and on more severe conditions. These production systems have demanded the use of forged equipments made of higher strength steel grades, such as austenitic-ferritic (duplex) stainless steels. These components are more prone to exhibit loss of ductility and general mechanical performance caused by hydrogen generated e.g. by cathodic protection. Duplex stainless stainless steels components present a vast history of hydrogen damage at low temperatures, due to hydrogen derived from various sources. Even being this kind of damage fairly recurring, various related information remains to be elucidated, due to the complex interaction of hydrogen with the microstructure and localized character of hydrogen generation and transportation in the material. The present work aims to improve the physical understanding of the interaction between hydrogen and the microstructure as well as the effects of different hydrogen charging procedures on the mechanical properties of forged components made of the super duplex stainless steel grade UNS S32750.The development of such understanding involves the evaluation of the effects of hydrogen on the mechanical properties of the material through tensile tests in different hydrogen-rich environments. Based on results of slow-strain rate tensile tests, a quantitative relationship between embrittlement caused by gas hydrogen and cathodic charging is proposed, and possible effects of dislocation-assisted hydrogen transportation and embrittlement are discussed. Quantitative and qualitative descriptions of the hydrogen transportation, including analysis of the effects of different microstructures and diffusion paths, and of its position in the lattice and in the microstructure (hydrogen segregation to traps) are proposed. These descriptions are achieved considering results of different testing techniques: permeation tests, thermal desorption spectroscopy, time-of-flight secondary ion mass spectroscopy and neutron scattering
Poinsot, Jocelin. "Influence des éléments cuivre et tungstène sur les mécanismes de corrosion localisée des super-duplex". Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCK013.
Testo completoSuper duplex stainless steels (SDSS) are interesting engineering materials, due to their generally high corrosion resistance combined with high strength. They are widely used in various industrial sectors, such as oil & gas (pipelines and storage tanks), desalination (evaporators and pumps), geothermal, pollution control (scrubber) and pulp and paper (digester and bleaching reactors) industries.In this PhD thesis, the influence of the addition of copper and tungsten in SDSS on their localised corrosion resistance (pitting) was investigated. Three alloys studied were: UR2507, UR2507Cu (1.6 %wt. Cu) and UR2507W (0.6%wt. Cu and 0.6%wt. W).The thickness and chemical composition of the passive film formed on the three alloys after optimised surface preparation was first investigated by means of X ray photoelectron spectroscopy and Auger electron spectroscopy before and after immersion in highly concentrated NaCl solutions. Pitting corrosion resistance was then investigated in NaCl-based media using the critical pitting temperature testing method combined with the electrochemical microcell technique (capillary diameter of about 300 microns) and potentiostatic pulse technique (PPT). Local CPT measurements were used to compare the resistance of the three different alloys to pitting while PPT enables to compare the size of the pits formed. In addition, pitting potentials were measured in samples with 5 cm² area in solutions of different NaCl concentrations and temperatures. These measurements are closer to the real using conditions of the alloys.It was showed that copper and tungsten effects on localised corrosion resistance in SDSS depend on the using media (T, [Cl-]) and the initiation and start of the propagation phases can also be influenced by parameters not linked to composition such as local pH and surface conditions (cold-work layer)
Ballésio, Sébastien. "Caractérisation et modélisation de la tenue à la fatigue et à la corrosion de l’acier inoxydable super duplex 2507 obtenu par fabrication additive LP-DED". Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. http://www.theses.fr/2024IPPAE011.
Testo completoThe main objective of this thesis is to propose an in-depth study of the "Super duplex 2507 stainless steel - Laser Powder-Direct Energy Deposition (LP-DED) process" combination and to establish an approach for optimising the manufacturing process (with or without heat treatment) in terms of mechanical and electrochemical properties. Several steps are being taken to achieve this objective.Firstly, criteria for assessing the quality of the material deposited by additive manufacturing are defined. This led to the optimisation of printing parameters using the LP-DED BeAM Mobile-004 machine and SAF2507 super duplex stainless steel powder.Next, the impact of the process on the microstructure is assessed, as well as the impact of various heat treatments applied to the LP-DED raw material. A comparison with a forged steel of the same grade is also proposed, enabling the differences and similarities between conventional processes and metal additive manufacturing to be put into perspective.Uniaxial tensile tests, hardness tests, pitting corrosion tests and fatigue test campaigns are then carried out on the various materials obtained. This experimental phase enables the influence of microstructure to be studied and variations in the properties examined to be observed.Finally, a model is proposed to describe the fatigue behaviour observed in super duplex 2507 stainless steel. This model takes account of the two-phase nature of the material, with each phase exhibiting a specific behaviour. The proportion of each phase is integrated in an attempt to reflect the contrasts observed during self-heating fatigue testing campaigns as a function of the material's microstructure.This thesis contributes to a better understanding and optimisation of the LP-DED additive manufacturing process for super duplex 2507 stainless steel, by highlighting the importance of the microstructure on the mechanical and electrochemical properties of the material
Kchaou, Yacine. "Etude comparative de la tenue mécanique des joints soudés des réservoirs sous pression de deux aciers inoxydables super austénitique et duplex". Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2015. http://www.theses.fr/2015ESMA0005/document.
Testo completoThis thesis focused on the study of low cycle fatigue and crack growth of welded joints of superaustenitic (Alloy28) and Duplex (UNS S32550) stainless steels. The effect of the presence of the welded joint in the structure was also examined.The first part of this work was to study the monotonous and cyclic behavior of the base metal and weld metal of each stainless steel. The behavior laws of each material were identified at room temperature.Low cycle fatigue tests at different levels of deformation were performed on stainless steels and their welded joints. The results indicate that the fatigue life of welded joints is lower than the base metal. The analyses of damage mechanisms show that the short life of welded joints is attributed to the acceleration of the initiation phase.Finally, crack propagation tests in Alloy28 stainless steel show that load ratio has an effect on the crack growth rate due to the closure phenomenon by roughness and plasticity. The crack growth rate in the weld metal is very similar to that of the base metal. This is due to the compensation of various effects such as the roughness, the residual stress and the closure phenomenon. The duplex stainless steel does not present load ratio effect on the crack growth rate. The crack growth rates of the weld metal of the duplex stainless steel are also comparable to those of the base metal
Massol, Karen Vogt Jean-Bernard Foct Jacques. "Influence de la microstructure et de l'environnement sur le comportement en fatigue d'aciers inoxydables duplex alliés à l'azote". [S.l.] : [s.n.], 2001. http://www.univ-lille1.fr/bustl-grisemine/pdf/extheses/50376-2001-3-4.pdf.
Testo completoXu, Yun. "Contribution à l'étude de l'endommagement par fatigue d'alliages biphasés : fatigue-torsion oligocyclique d'un acier inoxydable duplex". Saint-Etienne, EMSE, 2005. http://www.theses.fr/2005EMSE0035.
Testo completoThe aim of the research is to include/understand the cyclic damage mechanisms in fatigue-torsion. The materials chosen in this work were thoroughly analysed in uniaxial fatigue tests and the comparisons between the results obtained with these two modes of request are herein included. In the single-phase steels and , a new core cracking was observed. Cracking along the the test-material axis has a beneficial effect and can often induce a rather astoundingly fast progressive rupture. With regard to the mechanisms of propagation in volume, observations of the face of the cracks were equally carried out and the results show that coalescence on the surface does not accelerate the damage. In the aged duplex steel at 475°C during 200h, our investigation was focused on the role of each of the individual phases present throughout the deformation process. At low level deformation, the majority of the cracks started in the grains of the -phase and, the fraction of the cracks which makes however part in the -grains, increases with the increase in the amplitude of subsequently imposed deformation. Our published results were an upgrading on the already existent barrier model, originally proposed by Jacques STOLARZ. The brittleness of the aged duplex steel provokes an instability on the symmetry level of the of the maximum constraints in the two deformation directions. An obvious asymmetry can occur under certain conditions, such as the temporary halt, or the interruption and resumption of cycling. According to our observations, a non-null average constraint can improve the lifespan in fatigue-torsion
El, Bartali Ahmed. "Apport des mesures de champs cinématiques à l’étude des micromécanismes d’endommagement en fatigue plastique d’un acier inoxydable duplex". Ecole Centrale de Lille, 2007. http://tel.archives-ouvertes.fr/docs/00/25/47/32/PDF/These_ElBartali.pdf.
Testo completoThe aim of this work is firstly to develop an in-situ microscopy device to perform surface damage observations at the microstructural scale on standard duplex stainless steel fatigue specimen during low-cycle fatigue tests, and secondly, to acquire digital images regularly during cycling to analyse damage thanks to kinematical fields calculated by digital image correlation (DIC) technique. Surface observations allow to identify and to follow development and localisation of cyclic plastic strain, to identify microcrack initiation sites, and to follow propagation of these cracks at the surface. These observations combined with EBSD analysis enable to identify activated slip systems in each phase. The relief measurements by interferometric profiler allow to characterise the morphology of the slip markings appeared at the surface. The random surface texture necessary to DIC is obtained by a lightly electrochemically etching of the specimen. Fields measured highlight strain heterogeneities at grain scale, cumulated plastic strain levels and their dispersions in each phase. They allow also to detect the probable microcrack initiation sites, very before their observation. The study shows the complementarity of the various techniques used, in particular the interest of field measurements at the microstructural scale, towards the understanding of low-cycle fatigue damage in a two-phased material such as a duplex stainless steel
David, Charles. "Influence de la déformation plastique sur la résistance à la corrosion de l'acier inoxydable lean duplex UNS S32304". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI026/document.
Testo completoLean duplex stainless steels are alloys basically composed of iron, chromium and nickel in which two cristallographic phases coexist (austenite - γ and ferrite - α). These steels present high mechanical properties and corrosion resistance, and find their main applications in the offshore oil exploration and water desalinization sectors. Despite the excellent properties, the effect of plastic strain induced by forming on the corrosion resistance of these materials is yet to be understood, and may represent an improvement lever for these alloys. This study had thereby the aim of determining the microstructure parameters related to plastic strain and that might have an impact on the oxidation reaction of the metal and on the hydrogen evolution reaction (HER), which are often connected to corrosion phenomena of metals in acidic environments. The role of the emergence of slip steps, which are the result at the surface of the sliding of dislocations inside the metal while it deforms plastically, were also studied. Specimens for tensile testing made from UNS S32304 lean duplex stainless steel were strained by interrupted uniaxial tensile testing at different levels ranging from 0% to approximately 20%. A group of specimens with and another group without presence of slip steps on the surface were produced. A study of the plasticity mechanisms of the lean duplex stainless steel was carried out. It mainly involved characterizations of structures of dislocations, internal stresses and slip steps. It distinguished the ferritic and austenitic phases. Corrosion rates (oxidation) of the metal and HER taking place at its surface were studied by electrochemical technique in acidic chloride medium. It was demonstrated that, in the absence of slip steps, plastic strain has no detectable effect on its corrosion resistance in the conditions of the study. Nevertheless, slip steps have shown a strong impact on corrosion rates. That was related to a modification of HER kinetics. For low stain levels (up to approximately 3%), corrosion rates as well as HER kinetics strongly increased (up to 4 times), and then decreased and reached values similar to the ones of the unstrained state at approximately 10% of strain. Tests on monophasic steels having chemical compositions similar to those of each phase of the lean duplex stainless steel have confirmed this important role played by steps. The same has been observed by a local electrochemical technique based on microcapillaries. After confrontation with a simulation based on literature, the analysis points to an explanation involving the electron work function of the surface presenting slip steps and to the role played by the emergence of (111) plans
Maetz, Jean-Yves. "Évolution de la microstructure d’un acier inoxydable lean duplex lors du vieillissement". Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0008/document.
Testo completoLean duplex stainless steels are austeno-ferritic steels with lower nickel and molybdenum contents, developed in the late 90's. Considering mechanical properties, corrosion resistance and cost of raw material, this family is an interesting alternative to standard austenitic stainless steels, which currently represent two thirds of stainless steel production. However, lean duplex steels are relatively recent and their thermal stability has been relatively little studied, especially during long term aging. In this study, the microstructural evolution of a lean duplex steel 2101 was studied during isothermal aging at temperatures between 20 °C and 850 °C, from few minutes to several months. Aging kinetics were followed by thermoelectric power measurements (TEP), from which aged states were selected to be characterized by electron microscopy and atom probe tomography. At intermediate temperatures of 350 - 450 °C, Fe-Cr demixing and precipitation of Ni-Mn-Al-Si-Cu occur in the ferrite despite the low nickel content of this grade, leading to an increase in the TEP. For higher temperatures, at about 700 °C, the mechanisms which govern the different microstructural evolutions have been described by a multi-scale approach: the nucleation and growth of M23C6 and Cr2N, observed from few minutes of aging and the σ phase precipitation, observed for longer aging time. The latter is accompanied by a transformation of δ ferrite in γ2 secondary austenite, and by the partial transformation of austenite into martensite during cooling. The effect of different phases on the TEP of the lean duplex steel can be qualitatively described during aging by a rule of mixture
Massol, Karen. "Influence de la microstructure et de l'environnement sur le comportement en fatigue d'aciers inoxydables duplex alliés à l'azote". Lille 1, 2001. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2001/50376-2001-3-4.pdf.
Testo completoLes essais effectué à l'air ont montré une dépendance du comportement des matériaux en fonction du niveau de déformation. Pour de faibles sollicitations, l'austénite accommode pratiquement à elle seule la déformation plastique. Par contre, dès que des niveaux de déformation trop important sont atteints, la ferrite devient de plus en plus active. La présence d'un milieu corrosif a entraîné une diminution générale des durées de vie des matériaux, l'acier contenant 0. 4wt% d'azote montrant tout de même une meilleure résistance. De même, alors que le matériau ne contenant que 0. 25wt% d'azote a montré une très grande sensibilité à un vieillissement de 200 heures à 475ʿC, la résistance du deuxième alliage n'a pas été modifiée. Les performances de l'acier à 0. 4wt% d'azote ne sont pas directement dues à cette forte teneur en azote mais plutôt à l'effet indirect qu'elle entraîne qui est l'augmentation de la quantité d'austénite au sein du matériau. Ceci constituera nos principales conclusions
Libri sul tema "Acier inoxydable super duplex"
Corrosion of Duplex Stainless Steels : : A Practical Guide for Engineers. Association for Materials Protection and Performance (AMPP), 2018.
Cerca il testo completoCorrosion of Duplex Stainless Steels : : A Practical Guide for Engineers. Association for Materials Protection and Performance (AMPP), 2022.
Cerca il testo completo