ETUDE DE LA PRECIPITATION DES PHASES GAMMA '(LL PDF Download

Author: R.. COZAR
Publisher:
ISBN:
Category :
Languages : fr
Pages : 16

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Book Description
ETUDE BIBLIOGRAPHIQUE DES FACTEURS INFLUENCANT LA FORMATION DES PHASES GAMMA ' ET GAMMA ''. STRUCTURE CRISTALLOGRAPHIQUE DE CES 2 PHASES. PRECIPITATION DURCISSANTE DANS LES ALLIAGES FE-NI-TA OU FE-NI-CO-TA. INFLUENCE DES ELEMENTS D'ALLIAGE SUR LA NATURE, LA STRUCTURE ET LA MORPHOLOGIE DE LA PRECIPITATION. DANS L'INCONEL 718 LA PRESENCE DE TI, AL ET NB PROVOQUE LA PRECIPITATION SIMULTANEE DES PHASES GAMMA ' ET GAMMA ''

Author: ANNE.. RACINE-KIRSCH
Publisher:
ISBN:
Category :
Languages : fr
Pages : 180

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Book Description
LES PARTIES LES PLUS SOLLICITEES DES TURBOREACTEURS DE HAUTE PERFORMANCE ELABOREES EN SUPERALLIAGE MONOCRISTALLIN A BASE NICKEL SONT ESSENTIELLEMENT SOUMISES AU FLUAGE. DE NOMBREUSES ETUDES ONT MONTRE UNE EVOLUTION MORPHOLOGIQUE DU BIPHASE -': LES PRECIPITES ' COALESCENT. CETTE COALESCENCE EST DE PLUS ORIENTEE ET DEPEND DE LA NATURE ET DU NIVEAU DE LA CHARGE APPLIQUEE, DU SIGNE ET DE L'AMPLITUDE DU DESACCORD PARAMETRIQUE ENTRE LES DEUX PHASES. TRES PEU DE RENSEIGNEMENTS SONT CEPENDANT DISPONIBLES QUANT AUX MECANISMES INITIATEURS DE CETTE EVOLUTION AU TOUT DEBUT DU FLUAGE, CE A QUOI NOUS NOUS SOMMES DONC INTERESSES DANS CETTE THESE. L'ETUDE DES PHENOMENES MICROSTRUCTURAUX PAR MICROSCOPIE ELECTRONIQUE A TRANSMISSION A MONTRE QUE LA COALESCENCE POUVAIT DEBUTER EN L'ABSENCE DE DISLOCATIONS AUX INTERFACES /'. LA MICROANALYSE X EN TRANSMISSION A MIS EN EVIDENCE DES SEGREGATIONS CHIMIQUES A L'ECHELLE DES PHASES, TELLES QUE LES ELEMENTS '-GENES SEGREGENT DANS LES COULOIRS DE MATRICE DESTINES A DISPARAITRE PAR COALESCENCE, LES ELEMENTS -GENES SEGREGEANT EN SENS INVERSE. LA COMPARAISON DE CES TENDANCES AVEC LA REPARTITION DES CONTRAINTES LOCALES OBTENUES PAR SIMULATION AUX ELEMENTS FINIS MONTRE QU'UNE ANISOTROPIE DE L'ETAT MECANIQUE LOCAL PEUT INDUIRE DES FLUX D'ESPECES CHIMIQUES. CES INFORMATIONS EXPERIMENTALES NOUS PERMETTENT DE REDISCUTER CERTAINS MODELES PROPOSES DANS LA LITTERATURE ET DE CONCLURE QUE PLUSIEURS MECANISMES COOPERENT PROBABLEMENT A L'EVOLUTION SOUS CONTRAINTE DE LA MICROSTRUCTURE DES SUPERALLIAGES -'

Author: Madeleine Durand-Charre
Publisher: Routledge
ISBN: 1351409824
Category : Technology & Engineering
Languages : en
Pages : 139

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Book Description
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.

Author: Loeïz Nazé
Publisher: Elsevier
ISBN: 0128193581
Category : Technology & Engineering
Languages : en
Pages : 612

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Book Description
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

Author: C. Barry Carter
Publisher: Springer
ISBN: 3319266519
Category : Technology & Engineering
Languages : en
Pages : 543

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Book Description
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.

Author: David L. McDowell
Publisher: ASTM International
ISBN: 0803118627
Category : Alloys
Languages : en
Pages : 455

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Book Description
Papers presented at the ASTM Symposium on Multiaxial Fatigue, held in San Diego, November 1991, to communicate the most recent international advances in multiaxial cyclic deformation and fatigue research as well as applications to component analysis and design. The 24 papers are grouped into five ca

Author: George F. Vander Voort
Publisher: ASM International
ISBN: 1615032363
Category : Technology & Engineering
Languages : en
Pages : 770

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Book Description
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.

Author: Claude Bathias
Publisher: John Wiley & Sons
ISBN: 1118623371
Category : Technology & Engineering
Languages : en
Pages : 415

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Book Description
The design of mechanical structures with improved and predictable durability cannot be achieved without a thorough understanding of the mechanisms of fatigue damage and more specifically the relationships between the microstructure of materials and their fatigue properties. Written by leading experts in the field, this book (which is complementary to Fatigue of Materials and Structures: Application to Damage and Design, also edited by Claude Bathias and André Pineau), provides an authoritative, comprehensive and unified treatment of the mechanics and micromechanisms of fatigue in metals, polymers and composites. Each chapter is devoted to one of the major classes of materials or to different types of fatigue damage, thereby providing overall coverage of the field. The book deals with crack initiation, crack growth, low-cycle fatigue, gigacycle fatigue, shorts cracks, fatigue micromechanisms and the local approach to fatigue damage, corrosion fatigue, environmental effects and variable amplitude loadings, and will be an important and much used reference for students, practicing engineers and researchers studying fracture and fatigue in numerous areas of mechanical, structural, civil, design, nuclear, and aerospace engineering as well as materials science.

Author: Georges Cailletaud
Publisher: John Wiley & Sons
ISBN: 1848215800
Category : Technology & Engineering
Languages : en
Pages : 293

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Book Description
This book focuses on a particular class of models (namely Multi-Mechanism models) and their applications to extensive experimental data base related to different kind of materials. These models (i) are able to describe the main mechanical effects in plasticity, creep, creep/plasticity interaction, ratcheting extra-hardening under non-proportional loading (ii) provide local information (such us local stress/strain fields, damage, ….). A particular attention is paid to the identification process of material parameters. Moreover, finite element implementation of the Multi-Mechanism models is detailed.

Author: Jacques Besson
Publisher: Springer Science & Business Media
ISBN: 9048133564
Category : Science
Languages : en
Pages : 433

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Book Description
In mechanical engineering and structural analysis there is a significant gap between the material models currently used by engineers for industry applications and those already available in research laboratories. This is especially apparent with the huge progress of computational possibilities and the corresponding dissemination of numerical tools in engineering practice, which essentially deliver linear solutions. Future improvements of design and life assessment methods necessarily involve non-linear solutions for inelastic responses, in plasticity or viscoplasticity, as well as damage and fracture analyses. The dissemination of knowledge can be improved by software developments, data base completion and generalization, but also by information and training. With such a perspective Non-Linear Mechanics of Materials proposes a knowledge actualization, in order to better understand and use recent material constitutive and damage modeling methods in the context of structural analysis or multiscale material microstructure computations.