Littérature scientifique sur le sujet « Poudres métalliques – Traitement thermique – Propriétés mécaniques »
Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres
Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « Poudres métalliques – Traitement thermique – Propriétés mécaniques ».
À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.
Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.
Articles de revues sur le sujet "Poudres métalliques – Traitement thermique – Propriétés mécaniques":
Younes, Rassim, Mohand Amokrane Bradai, Abdelhamid Sadeddine, Youcef Mouadji et Abderrahim Benabbas. « Influence des post-traitements sur la résistance à l’usure des dépôts en superalliage Ni-Cr-Al-Mo obtenus par projection thermique ». Matériaux & ; Techniques 106, no 6 (2018) : 605. http://dx.doi.org/10.1051/mattech/2019003.
Thèses sur le sujet "Poudres métalliques – Traitement thermique – Propriétés mécaniques":
Song, Bo. « Nouvelles voies de fabrication d'alliages métalliques à hautes performances à partir de poudres ». Phd thesis, Université de Technologie de Belfort-Montbeliard, 2014. http://tel.archives-ouvertes.fr/tel-01004824.
Vinson, Pierre. « Fusion sélective par laser de lits de poudre : Étude sur le recyclage de la poudre et détection de défauts au cours de la fabrication par imagerie thermique ». Thesis, Paris, ENMP, 2015. http://www.theses.fr/2015ENMP0068.
Direct and additive manufacturing regroups several new technologies that are very different from conventional manufacturing processes such as casting. Aeronautic and space industries are really interested in those new processes such as the selective laser melting of metallic powder beds know as the SLM process. This PhD thesis report will show the issues of additive manufacturing and will describe some processes. A bibliography study has been done on two aeronautical alloys used in this work: titanium alloy TA6V and nickel-based superalloy Nimonic 263. This work also presents powder characterization (granulometry, morphology chemical composition) for the gas atomized powder. Besides, study has been done on the recyclability of the TA6V powder for the SLM process, for the powder itself and the mechanical properties of parts built from recycled powder. Moreover, this works deals with a powder bed consolidation model to estimate the productivity of the process. Then, a parametric and thermal study has been done on the Nimonic 263. The coaxial system for thermal visualization is described such as the image processing algorithm used. Finally, this reports deals with the study of thermal signature of typical SLM defects
Sow, Mourtada Aly. « Alliages à Haute Entropie (AHE) pour revêtements hautes performances ». Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILR026.
This thesis aims to develop high performance coatings from high entropy alloys powders (HEA) and to characterize them. This work is divided in two parts. The first part consists in the synthesis of HEA powders for a family of alloy elements Al, Cr, Fe, Mn and Mo by mechanical alloying.These powders were characterized by XRD, SEM and Mössbauer spectrometry. These powders have a CC1 and CC2 type crystal structure. The heat treatment of the powders (500, 650, 800 and 950 °C) allowed to obtain a structural stability at 650 °C/ 1h, at 800 °C/ 1h and 950°C/ 1h and 4h, a structural evolution of the powders was noticed. The CC1 phase disappears in favor of the CC2 phase and the M23C6 et M6C type carbides. At the result of these characterizations, the chemical composition 19Al-22Cr-34Fe-19Mn-6Mo powder was preserved and produced in suffering quantities by mechanical synthesis (powder A) and by mixing (powder B).In the second part of this work, thick and thin HEA coatings were developed by laser fusion and magnetron sputtering respectively from A and B powders. The thick laser-melted coatings were deposited on steel substrate. The structure and microstructure of the deposits were carefully characterized by XRD, SEM, EDS, EBSD and TEM. The results of these characterizations revealed that the thick deposits are chemically heterogeneous. Moreover, these coatings showed different structures and microstructures of solidification depending on the deposition conditions and the powders (A or B) pre-deposited to realize these coatings.The HEA thin film were deposited on silicon wafer and steel substrate. The deposition conditions of the thin films were optimized and the chemical composition was controlled. The heat treatments of the thin films revealed good structural and microstructural stability up to 800 °C/ 72h. Corrosion resistance, mechanical properties and tribological performances were evaluated
Huvier, Corine. « Consolidation de poudres métalliques par compression isostatique et chocs laser : microstructures et propriétés d'agglomérés obtenus avec des poudres de cuivre allié ». Poitiers, 1994. http://www.theses.fr/1994POIT2266.
Augustins-Lecallier, Isabelle. « Conception de nouveaux superalliages MdP base nickel pour disques de turbines ». Phd thesis, Paris, ENMP, 2011. https://pastel.hal.science/pastel-00710579.
In order to upgrade the SNECMA M88 engine, new specifications were issued for the material of the parts that are currently made by forging and machining N18 superalloy, including, essentially, turbine discs. This study focuses on the development of new Nickel base polycrystalline superalloys which meet these specifications, i. E. Which generally exhibit mechanical properties and microstructural stability better than that of alloy N18, in spite of a significant reduction of the γ' volume fraction. Refering to the state of the art on the specific role of each of the various alloying elements and of heat treatments on the microstructural and mechanical characteristics of the superalloys, new compositions are explored. The microstructures of these experimental alloy compositions are analysed. Tensile, creep and crack propagation tests are performed in order to compare the properties of these new alloys with those of reference, industrially used, superalloys. Among the evaluated alloys, those exhibiting a remarkable tensile and creep resistance were examined by transmission electron microscopy in order to identify the various deformation mechanisms: an interpretation of the outstanding resistance to deformation is presented
Augustins-Lecallier, Isabelle. « Conception de nouveaux superalliages MdP base nickel pour disques de turbines ». Phd thesis, École Nationale Supérieure des Mines de Paris, 2011. http://pastel.archives-ouvertes.fr/pastel-00710579.
Malaplate, Joël. « Etude du fluage à 750ʿC d'alliages Ti48 AI48Cr2Nb2 obtenus par les voies métallurgie des poudres et fonderies ». Toulouse 3, 2003. http://www.theses.fr/2003TOU30060.
Curtet, Émilien. « Évolution microstructurale et compréhension des mécanismes de déformation d'un acier austénitique stabilisé au titane pour les réacteurs de quatrième dimension ». Thesis, Poitiers, 2019. http://www.theses.fr/2019POIT2293.
The fourth generation of nuclear reactors must meet new requirements for safety, energy efficiency, and integration into the nuclear fuel cycle. The CEA is a primary actor in this field and is developing new concepts for sodium-cooled fast reactors. The fuel cladding material being considered for these reactors is 15-15Ti AIM1 steel (Austenitic Improved Material #1), which is an advanced austenitic stainless steel containing 15-wt% chromium and 15-wt% nickel, Ti-stabilized and slightly cold-worked. This steel exhibits a singular loss of ductility between 20 and 200°C: the uniform and total elongations (UE and TE) are reduced by a factor of 3 in this temperature range. In addition, the effect of thermal aging on the microstructure and mechanical behavior is poorly known in the lowest operating conditions that are between 400 and 600°C. In this context, the objectives of this Ph.D. thesis are: - Increase our knowledge of the deformation mechanisms involved in the singular behavior at 200°C ; - Study the influence of a thermal aging between 400 and 600°C on the microstructural evolutions and on the mechanical behavior, with particular attention on the singularity at 200°C. Examining the relation between the singular behavior at 200°C and the related deformation mechanisms required a multi-scale approach combining techniques such as tensile tests, Electron Backscatter Diffraction (EBSD), and Transmission electron Microscopy (TEM). The analyses revealed: - A coexistence of twinning and perfect slip at 20°C;- An extinction of twinning replaced by a predominance of perfect slip associated with cross-slip at 200°C;- A continuous increase of the Stacking Fault Energy (SFE) from 20 to 200°C. In particular, the measured values are respectively 27 mJ/m² and 46 mJ/m². The evolution of the deformation mechanisms of 15-15Ti AIM can be explained by a competition between twinning and cross-slip for releasing the strain energy of the material. At 20°C, both dislocation glide and twinning are active, and the twinning produces a “Dynamic Hall-Petch Effect”, which produces continual strain hardening of the microstructure even at high strains, which leads to high ductility. On the other hand, the stacking fault energy is high at 200°C, so twinning no longer occurs, but cross-slip becomes active. Thus, little strain hardening occurs at 200°C, which leads to the rapid onset of strain localization and reduced ductility.Samples that were aged between 400 and 600°C for 1000 hours exhibit no evidence of material recovery. However, TEM observations established a new threshold for the precipitation of nanometric titanium carbides after an isothermal treatment at 500°C for 5000 hours. Concerning the tensile properties, the aged states present a gain both in strength (especially in Ultimate Tensile Strength) and in ductility (UE, TE) compared to the initial cold-worked state. This gain in ductility is observed for all of the temperatures tested (between 20 and 400°C) and is accompanied by an increase of the strain hardening rate of the material. One plausible hypothesis to explain this improvement of the mechanical behavior relies on the nanometric titanium carbides formed during the aging process. These precipitates could prevent by pinning the initially present dislocations to recombine or annihilate with the dislocations introduced by the tensile test
Garcia, de la Cruz Lucia. « Ultrafine grained nickel processed by powder metallurgy : microstructure, mechanical properties and thermal stability ». Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC224.
The present manuscript concerns the synthesis of ultrafine grained (UFG) Ni by powder metallurgy, and the study of the influence of UFG microstructures on the mechanical behavior and physical properties. The possibilities of coupling ball milling and Spark Plasma Sintering are presented showing promising results. Highly dense homogeneous specimens are obtained, with average grain sizes d = 0.65 - 4 µm, and microstructures highlighted by a high fraction of Σ3 grain boundaries dependent on grain size. The mechanical properties in tensile testing for UFG samples are evaluated showing a good combination of strength and ductility, with little impact from porosities, the major drawback of powder metallurgy. The influence of grain size in the UFG regime on the mechanical properties is investigated, showing strength values that deviate from the expected behavior for grain refinement. Likewise, a reduced strain hardening capacity is depicted which correlates to the microstructural observations performed on the deformed state. High diffusivity measured by means of radiotracer experiments is observed in the sintered samples, displaying different penetration profiles that relate to diverse porosity structures. Such structures are also responsible for retrograde sintering observed exclusively in samples processed from BM powders