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Статті в журналах з теми "Acier à haut taux de carbone"
Saleil, Jean, and Jean Le Coze. "La coulée continue des aciers. Un exemple de développement technique où l’étroite coopération entre métallurgistes, constructeurs et exploitants a été d’une grande fécondité." Matériaux & Techniques 106, no. 5 (2018): 505. http://dx.doi.org/10.1051/mattech/2018046.
Повний текст джерелаHamdaoui, O., M. Ouchefoun, and M. Zerdaoui. "Inhibition de la corrosion d'un acier au carbone par le Kemazur 1620." Revue des sciences de l'eau 13, no. 1 (April 12, 2005): 47–54. http://dx.doi.org/10.7202/705380ar.
Повний текст джерелаOualit, Mehena, Amar Irekti, and Arezki Sarri. "Influence des conditions de durcissement et le taux d’alcalins sur les performances mécaniques des matériaux alcali-activés à base du laitier de haut fourneau." Matériaux & Techniques 110, no. 2 (2022): 202. http://dx.doi.org/10.1051/mattech/2022017.
Повний текст джерелаOualit, Mehena, Amar Irekti, and Arezki Sarri. "Influence des conditions de durcissement et le taux d’alcalins sur les performances mécaniques des matériaux alcali-activés à base du laitier de haut fourneau." Matériaux & Techniques 110, no. 2 (2022): 202. http://dx.doi.org/10.1051/mattech/2022017.
Повний текст джерелаLafont, M. C., N. Pebere, F. Moran, and P. Bleriot. "Inhibition de la corrosion d'un acier au carbone par des produits dérivés de phosphonates en association avec des sels de zinc." Revue des sciences de l'eau 6, no. 1 (April 12, 2005): 97–112. http://dx.doi.org/10.7202/705168ar.
Повний текст джерелаДисертації з теми "Acier à haut taux de carbone"
Massard, Quentin. "Compréhension et maîtrise de la mise en oeuvre en fabrication additive d’aciers à haute teneur en carbone tel que le 100Cr6 par fusion sélective par laser sur lit de poudre." Electronic Thesis or Diss., Ecully, Ecole centrale de Lyon, 2022. http://www.theses.fr/2022ECDL0024.
Повний текст джерелаNowadays, the production of steel parts by additive manufacturing (AM) is a central topic in the world of industry, including automotive. Indeed, the possibilities offered by additive manufacturing are diverse and numerous (weight reduction, complex shapes, ...). 100Cr6 is a high mechanical performance steel, mainly used for the production of ball bearings, due to its high hardness and fatigue resistance. A processability study of 100Cr6 steel produced by selective laser melting on powder bed was first performed. After having characterized the physical and chemical properties of the material, dense and non-cracked samples were produced through a parametric optimization. A post-treatment cycle was defined and plane tensile tests and rotary bending fatigue tests were performed.In order to understand and control the cracking phenomenon of 100Cr6 when used in L-PBF, a thorough metallurgical study (microhardness, optical imaging, SEM, XRD, EBSD) was conducted. The influence of the use of the heating plate on the formation of Bainite and Martensite and their impact on cracking was highlighted.Finally, a recyclability study of the oxidized 100Cr6 powder was carried out through the use of a radiofrequency plasma spheroidization machine. A powder feed rate in the plasma allowing to regenerate the physical and rheological properties of the powder was defined. A cleaning method to improve the chemical properties of the powder was also proposed
Massé, Thomas. "Etude et optimisation d'une gamme de mise en forme à froid en acier haut carbone." Phd thesis, École Nationale Supérieure des Mines de Paris, 2010. http://tel.archives-ouvertes.fr/tel-00457046.
Повний текст джерелаKarolak, Cyprien. "CarboFrac : Analyse et modélisation de l'engrenage (d'un siège auto) en acier à faible teneur en carbone carbonitruré." Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM057/document.
Повний текст джерелаThis work aims at a better understanding and modeling of the failure of gradient metallic materials. It is applied to carbonitrided pinions made out of 20MnB5 steel, inserted in a "recliner", a safety mechanism of automotive seats. Carbonitriding induces high surface hardness while preserving significant core ductility. The experimental analysis of the fracture behavior of seat recliners in an industrial test confirmed the dual failure behavior of the component : brittle external layer, ductile core material. A test bench has been specifically designed for the project: one tooth is submitted to a lateral force until complete failure. In situ observations are performed and the load-displacement curve recorded, showing a variety of behaviors as a function of the teeth engagement depth and of the presence or not of the carbonitrided layer. Experimental tests with various tress states were conducted to measure plastic properties as well as to calibrate fracture criteria, for the carbonitrided layer and for the core steel. Von Mises plasticity and a simple strain hardening curve fit very well all these experiments. As fracture criteria from the literature were unable to predict failure correctly for all the mechanical tests, an adapted criterion has therefore been proposed as an outcome of this extensive mechanical testing campaign. Fracture simulation in LS Dyna has been performed using the element erosion technique, the limitations of which are discussed. Comparison with the experimental tooth fracture measurements allows evaluation of the proposed failure criteria, and enables to stress out and discuss the present limits of the simulation, concluding that it will be necessary in future work to account more finely for the mechanical property gradient together with the compressive residual stresses in the carbonitrided layer
Younsi, Akli, and Akli Younsi. "Carbonatation de bétons à forts taux de substitution du ciment par des additions minérales." Phd thesis, Université de La Rochelle, 2011. http://tel.archives-ouvertes.fr/tel-00717844.
Повний текст джерелаYounsi, Akli. "Carbonatation de bétons à forts taux de substitution du ciment par des additions minérales." Thesis, La Rochelle, 2011. http://www.theses.fr/2011LAROS342/document.
Повний текст джерелаCement is the main source of environmental impacts of concrete use. It is thus recognized that the most pragmatic solution for minimizing environmental impacts of concrete is the reduction of the cement content. This could be achieved by replacing a part of cement by mineral additions such as fly ash or blast-furnace slag during concrete mixing.The present work aims at studying the physico-chemical phenomena occurring during the process of carbonation of concrete mixtures with high substitution rates of cement by mineral additions and their resistance against this type of attack.An experimental campaign was conducted on reference concrete mixtures prepared with common cements and on other concrete mixtures, called “Écobétons” (Green concretes), prepared by replacing a part of cement by fly ash or blast-furnace slag. The study focused on the Écobétons durability, especially their resistance against carbonation, on the equivalence of Écobétons performances with the reference mixtures performances and on the composition and microstructure parameters controlling the kinetics of carbonation. Carbonation has been studied in natural and accelerated conditions. The results show that Écobétons mixtures with high substitution rates of cement by fly ash (50 %) and blast-furnace slag (75 %) could replace, in some cases, concretes that are in accordance with the current standard.In addition to the experimental study, numerical simulations of the coupling between hydration and drying were conducted in order to determine the effect of drying on the properties controlling the accelerated carbonation kinetics of the studied concrete mixtures (porosity, Portlandite content and water saturation degree). The results show that the kinetics of drying increases with the degree of substitution of cement by mineral additions. They also question the relevance of the preconditioning of the samples during accelerated carbonation test conducted according to the French standard XP P 18-458
Boutrif, Mehdi. "Dégradation de la matière organique dissoute de haut poids moléculaire par les communautés procaryotiques des zones méso- et bathypélagique." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4040.
Повний текст джерелаThis main objective of this work is the study of interactions between prokaryotic compartments of meso-and bathypelagic zones with different size classes of dissolved organic carbon (DOC). Several measurements of monomers assimilation (3H-Glucose), of complex molecules degradation (3H-EPS and HMW-DOC) and prokaryotic heterotrophic production were realized through the water column of NW Mediterranean Sea (Gulf of Lion, DYFAMED and ANTARES station) and NE Atlantic Ocean (PAP site). During these studies, all measurements realized below 1000 m depth, were carry out under in situ condition of hydrostatic pressure (> 10 MPa, HP) and compared to their decompressed counterpart measurements, realized at atmospheric pressure (0.1 MPa, ATM). These coupled measurements determine the role of hydrostatic pressure on deep sea microbial activity following the Pressure effect (Re) ration (=HP measurement / ATM measurement). The results show that microbial activities measured under HP condition during stratified water period, were more important than those measured under ATM condition (mean Pe = 4.01, n=120), and confirm the abilities of deep sea prokaryotes to degrade complex organic molecules. Moreover, the cell-specific activity of deep sea prokaryotes in 3H-EPS degradation are 6 time more active than the surface, indicating the ability of autochthonous deep sea prokaryotes to degrade complex molecules under high conditions of pressure
Ravalison, Soloarivelo Francia. "Étude comparative de l'effet de l'hydrogène sur la dureté de l'acier inoxydable 410, l'acier au carbone 1008 et l'acier inoxydable 444." Thèse, 2021. http://depot-e.uqtr.ca/id/eprint/9678/1/eprint9678.pdf.
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