Download or read book ETUDE ET MODELISATION DE LA COALESCENCE ORIENTEE DANS LES SUPERALLIAGES A BASE DE NICKEL written by Muriel Véron and published by . This book was released on 1995 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES SUPERALLIAGES MONOCRISTALLINS A BASE DE NICKEL PERMETTENT L'ELABORATION D'AUBES MONOCRISTALLINES DANS LES TURBINES DES TURBOREACTEURS A HAUTS RENDEMENTS. LORS DU FONCTIONNEMENT DES AUBES, A HAUTE TEMPERATURE ET SOUS CONTRAINTE, UNE EVOLUTION MICROSTRUCTURALE DE L'ALLIAGE EST OBSERVEE: LA PHASE DURCISSANTE COALESCE. CE TRAVAIL SUR DES MONOCRISTAUX DE SUPERALLIAGE A POUR BUT DE DETERMINER QUELS SONT LES PHENOMENES MIS EN JEU LORS DE CETTE EVOLUTION MICROSTRUCTURALE, ET SES IMPLICATIONS AU NIVEAU DU COMPORTEMENT MECANIQUE DE L'ALLIAGE. DANS LE CADRE DE NOS RECHERCHES, NOUS AVONS CARACTERISE LES PHENOMENES MICROSTRUCTURAUX PAR MICROSCOPIE ELECTRONIQUE EN TRANSMISSION (ETUDE DES DISLOCATIONS AUX INTERFACES), PAR DES ETUDES EN RAYONS X (PARAMETRES DE MAILLE), NOUS AVONS ETUDIE LES MORPHOLOGIES DE COALESCENCE OBTENUES APRES FLUAGE PAR MICROSCOPIE ELECTRONIQUE A BALAYAGE ET ANALYSE D'IMAGE. DES EXPERIENCES ORIGINALES POUR ETUDIER L'INFLUENCE D'UNE PREDEFORMATION SUR LA COALESCENCE ORIENTEE NOUS ONT PERMIS DE METTRE EN EVIDENCE LA FORCE MOTRICE DU PHENOMENE: C'EST LA RELAXATION ANISOTROPE DES CONTRAINTES DE COHERENCE PAR LES DISLOCATIONS MOBILES. CETTE RELAXATION ANISOTROPE EST A L'ORIGINE D'UN GRADIENT D'ENERGIE ELASTIQUE ENTRE DEUX INTERFACES MATRICE/PRECIPITE VOISINES, GENERANT DES FLUX DE DIFFUSION. EN NOUS APPUYANT SUR LES RESULTATS PRECEDENTS, NOUS AVONS DEVELOPPE UNE SIMULATION NUMERIQUE 3D A L'ECHELLE MESOSCOPIQUE, PERMETTANT DE RENDRE COMPTE DE L'EVOLUTION MORPHOLOGIQUE DES SUPERALLIAGES SOUS CONTRAINTE, ET CE, AVEC UNE CINETIQUE REALISTE. LE SUPERALLIAGE SIMULE EST UN RESEAU DE COULOIRS DE MATRICE, LEUR TAILLE ETANT DISTRIBUEE SUIVANT LA DISTRIBUTION OBSERVEE EXPERIMENTALEMENT. LA SIMULATION NOUS A PERMIS DE TRACER UNE CARTE DES MORPHOLOGIES DE COALESCENCE ATTENDUES EN REGIME PLASTIQUE, DANS LE PLAN (CONTRAINTE APPLIQUEE, DESACCORD PARAMETRIQUE). ENFIN, UNE ETUDE DE LA GEOMETRIE DES PLANS DE GLISSEMENT DES DISLOCATIONS A L'AIDE DE COUPES DU RESEAU SIMULE DE PRECIPITES NOUS PERMET DE DISCUTER DES CARACTERISTIQUES MECANIQUES DE LA STRUCTURE DES SUPERALLIAGES POUR DES MORPHOLOGIES COALESCEES OU NON
Download or read book The Microstructure of Superalloys written by Madeleine Durand-Charre and published by Routledge. This book was released on 2017-11-22 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents all the main aspects of the microstructure of nickel-base superalloys, and includes micrographs chosen from among a large range of commercial and academic alloys, from the as-cast product to in-situ components, worn from in-service use. Including more than 100 illustrations, the text explains all the transformation mechanisms involved in the origination (creation) of microstructures during solidification or heat treatments (crystallization paths, segregation, crystal orientation, precipitation, TCP, coarsening and rafting, etc.). It includes up-to-date information and data such as phase diagrams, crystallographic structures, and relationships with functional properties. Nearly 300 references provide a key to further investigation.
Download or read book Etude du vieillissement des superalliages base nickel par la m thode de champs de phase written by Guillaume Boussinot and published by . This book was released on 2007 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nous avons utilisé la méthode de Champs de Phase pour étudier l'évolution de la microstructure gamma-gamma' des superalliages à base nickel, couramment utilisés dans l'industrie aéronautique. L'énergie d'interface gamma/gamma' a fait l'objet de calculs de structure électronique afin de calibrer le modèle de Champs de Phase sur un alliage Ni-Al. Nous avons ensuite étudié le vieillissement de la population de petits précipités gamma' (tertiaires) dans une microstructure bimodale, destinée aux superalliages pour disques de turbine. Les mécanismes physiques gouvernant ce vieillissement ont alors été élucidés. Par la suite, nous avons étudié les superalliages pour aubes de turbine lorsqu'ils sont soumis à une sollicitation extérieure. Notre modèle nous a permis de reproduire la coalescence orientée, fréquemment observée expérimentalement. Nous avons alors, d'une manière phénoménologique, mis au point une première approche pour décrire le fluage des superalliages
Download or read book Etude des m canismes de d formation et d endommagement du superalliage base de nickel MC2 en fluage aux tr s hautes temp ratures written by Fabienne Touratier and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Le MC2 est un superalliage base nickel monocristallin constitué d'une matrice austénitique gamma renforcée par des précipités intermétalliques ordonnés gamma'. Cet alliage est couramment utilisé pour des applications à très haute température telles que les aubes de turbines. Son comportement aux très hautes températures est ici étudié en abordant deux aspects. Une modification du comportement en fluage anisotherme à 1150°C, où apparaissent une augmentation de la vitesse de fluage et une diminution de la durée de vie, ainsi qu'une direction de coalescence orientée des radeaux à 45° de la contrainte appliquée. Des essais de fluage isothermes et anisothermes à 1150°C, 1100°C et 950°C ont été réalisés et comparés à des simulations par éléments finis. Les microstructures obtenues ont été observées en microscopie électronique en balayage et à transmission. Nous proposons des mécanismes qui s'appuient sur la dissolution des radeaux, la montée des dislocations et des échanges de lacunes
Download or read book MONOCRISTAUX D ALLIAGES BASE NICKEL written by Allan Fredholm and published by . This book was released on 1987 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: ANALYSE DES PHENOMENES DE COALESCENCE ORIENTEE DE LA MICROSTRUCTURE AU COURS DU FLUAGE DANS DIFFERENTS SUPERALLIAGES A BASE DE NICKEL DURCIS PAR PRECIPITATION DE PHASE GAMMA '. CORRELATION ENTRE LA MICROSTRUCTURE ET LA RESISTANCE AU FLUAGE. DETERMINATION, A PARTIR DE L'INTERPRETATION DES RESULATS, UN CRITERE SIMPLE DE RESISTANCE AU FLUAGE
Download or read book The Microstructure of Superalloys written by Madeleine Durand-Charre and published by Routledge. This book was released on 2017-11-22 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents all the main aspects of the microstructure of nickel-base superalloys, and includes micrographs chosen from among a large range of commercial and academic alloys, from the as-cast product to in-situ components, worn from in-service use. Including more than 100 illustrations, the text explains all the transformation mechanisms involved in the origination (creation) of microstructures during solidification or heat treatments (crystallization paths, segregation, crystal orientation, precipitation, TCP, coarsening and rafting, etc.). It includes up-to-date information and data such as phase diagrams, crystallographic structures, and relationships with functional properties. Nearly 300 references provide a key to further investigation.
Download or read book Nickel Base Single Crystals Across Length Scales written by Loeïz Nazé and published by Elsevier. This book was released on 2021-09-28 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nickel Base Single Crystals Across Length Scales is addresses the most advanced knowledge in metallurgy and computational mechanics and how they are applied to superalloys used as bare materials or with a thermal barrier coating system. Joining both aspects, the book helps readers understand the mechanisms driving properties and their evolution from fundamental to application level. These guidelines are helpful for students and researchers who wish to understand issues and solutions, optimize materials, and model them in a cross-check analysis, from the atomistic to component scale. The book is useful for students and engineers as it explores processing, characterization and design. - Provides an up-to-date overview on the field of superalloys - Covers the relationship between microstructural evolution and mechanical behavior at high temperatures - Discusses both basic and advanced modeling and characterization techniques - Includes case studies that illustrate the application of techniques presented in the book
Download or read book Transmission Electron Microscopy written by C. Barry Carter and published by Springer. This book was released on 2016-08-24 with total page 543 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text is a companion volume to Transmission Electron Microscopy: A Textbook for Materials Science by Williams and Carter. The aim is to extend the discussion of certain topics that are either rapidly changing at this time or that would benefit from more detailed discussion than space allowed in the primary text. World-renowned researchers have contributed chapters in their area of expertise, and the editors have carefully prepared these chapters to provide a uniform tone and treatment for this exciting material. The book features an unparalleled collection of color figures showcasing the quality and variety of chemical data that can be obtained from today’s instruments, as well as key pitfalls to avoid. As with the previous TEM text, each chapter contains two sets of questions, one for self assessment and a second more suitable for homework assignments. Throughout the book, the style follows that of Williams & Carter even when the subject matter becomes challenging—the aim is always to make the topic understandable by first-year graduate students and others who are working in the field of Materials Science Topics covered include sources, in-situ experiments, electron diffraction, Digital Micrograph, waves and holography, focal-series reconstruction and direct methods, STEM and tomography, energy-filtered TEM (EFTEM) imaging, and spectrum imaging. The range and depth of material makes this companion volume essential reading for the budding microscopist and a key reference for practicing researchers using these and related techniques.
Download or read book Metallography Principles and Practice written by George F. Vander Voort and published by ASM International. This book was released on 1999-01-01 with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work offers a comprehensive source of information on metallographic techniques and their application to the study of metals, ceramics, and polymers. It contains an extensive collection of micro- and macrographs.
Download or read book Powder Metallurgy of Superalloys written by G. H. Gessinger and published by Elsevier. This book was released on 2013-10-22 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Powder Metallurgy of Superalloys details the advancement of powder metallurgy in the context of producing superalloys. The book is comprised of nine chapters that cover the underlying principles of superalloys produced through powder metallurgy. The text first covers concerns in pre-alloyed dispersion-free powders, such as powder production and characterization; powder consolidation methods; and quality control and non-destructive evaluation of P/M superalloys. The next chapter talks about oxide-dispersion-strengthened superalloys. Next, the book discusses joining techniques for P/M superalloys and the practical applications of P/M superalloys. The title will be of great use to professionals in the materials manufacturing industry.
Download or read book The Superalloys written by Chester Thomas Sims and published by John Wiley & Sons. This book was released on 1972 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superalloys II written by Chester T. Sims and published by Wiley-Interscience. This book was released on 1987-09-07 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive review of the latest developments in the pursuit of superalloys.
Download or read book Superalloys 1984 written by Maurice Gell and published by Society for Mining Metallurgy & Exploration. This book was released on 1984 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High temperature Structural Materials written by Robert Cahn and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional materials, such as nickel based alloys, will not be able to match the required performance specifications for the future generation of high temperature materials. This book reviews the characteristics and potential of a wide range of candidate superalloy replacements, such as ceramics, intermetallics, and their composites. Particular attention is devoted to the problems of processing and design with these materials.
Download or read book High Temperature Materials for Power Engineering 1990 written by E. Bachelet and published by Springer Science & Business Media. This book was released on 1990 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt: Themes reflect the work carried out within the framework of COST-501 and of COST-505 the latter being concerned with materials for steam turbines and the first results of the concerted action COST-501/II 'High temperature materials for power engineering' initiated in 1988.
Download or read book Materials for Advanced Power Engineering 1994 written by D. Coutsouradis and published by Springer Science & Business Media. This book was released on 1994 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt: The role of energy in the modern world goes beyond mere technology and economics to influence welfare, the environment, the quality of life and, in broad terms, civilization itself. Since the Industrial Revolution, energy conservation technology has been at the forefront of the innovation required to satisfy the needs of mankind and, more than any other, this technology has always depended on the performance of the materials used.
Download or read book High Temperature Alloys for Gas Turbines and Other Applications 1986 written by W. Betz and published by Springer Science & Business Media. This book was released on 1986 with total page 888 pages. Available in PDF, EPUB and Kindle. Book excerpt:
