The Superalloys

Fundamentals and Applications
Author: Roger C. Reed
Publisher: Cambridge University Press
ISBN: 1139458639
Category: Technology & Engineering
Page: N.A
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Superalloys are unique high-temperature materials used in gas turbine engines, which display excellent resistance to mechanical and chemical degradation. This book presents the underlying metallurgical principles which have guided their development and practical aspects of component design and fabrication from an engineering standpoint. The topics of alloy design, process development, component engineering, lifetime estimation and materials behaviour are described, with emphasis on critical components such as turbine blading and discs. The first introductory text on this class of materials, it will provide a strong grounding for those studying physical metallurgy at the advanced level, as well as practising engineers. Included at the end of each chapter are exercises designed to test the reader's understanding of the underlying principles presented. Solutions for instructors and additional resources are available at www.cambridge.org/9780521859042.

Cracks in superalloys


Author: Jonas Saarimäki
Publisher: Linköping University Electronic Press
ISBN: 9176853853
Category: Electronic books
Page: 50
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Gas turbines are widely used in industry for power generation and as a power source at hard to reach locations where other possibilities for electrical power supplies are insufficient. New ways of producing greener energy is needed to reduce emission levels. This can be achieved by increasing the combustion temperature of gas turbines. High combustion temperatures can be detrimental and degrade critical components. This raises the demands on the high temperature performance of the superalloys used in gas turbine components. These components are frequently subjected to different cyclic loads combined with for example dwell-times and overloads at elevated temperatures, which can influence the crack growth. Dwell-times have been shown to accelerate crack growth and change cracking behaviour in both Inconel 718, Haynes 282 and Hastelloy X. On the other hand, overloads at the beginning of a dwell-time cycle have been shown to retard the dwell-time effect on crack growth in Inconel 718. More experiments and microstructural investigations are needed to better understand these effects. The work presented in this thesis was conducted under the umbrella of the research program Turbo Power; "High temperature fatigue crack propagation in nickel-based superalloys", where I have mainly looked at fatigue crack growth mechanisms in superalloys subjected to dwell-fatigue, which can have a devastating effect on crack propagation behaviour. Mechanical testing was performed under operation-like cycles in order to achieve representative microstructures and material data for the subsequent microstructural work. Microstructures were investigated using light optical microscopy and scanning electron microscopy (SEM) techniques such as electron channeling contrast imaging (ECCI) and electron backscatter diffraction (EBSD). The outcome of this work has shown that there is a significant increase in crack growth rate when dwell-times are introduced at maximum load (0 % overload) in the fatigue cycle. With the introduction of a dwell-time there is also a shift from transgranular to intergranular crack growth for both Inconel 718 and Haynes 282. The crack growth rate decreases with increasing overload levels in Inconel 718 when an overload is applied prior to the dwell-time. At high temperature, intergranular crack growth was observed in Inconel 718 as a result of oxidation and the creation of nanometric voids. Another observed growth mechanism was crack advance along δ-phase boundaries with subsequent oxidation of the δ-phase. This thesis comprises two parts. Part I gives an introduction to the field of superalloys and the acting microstructural mechanisms related to fatigue and crack propagation. Part II consists of five appended papers, which report the work completed as part of the project.

Effect of Dwell-times on Crack Propagation in Superalloys


Author: Jonas Saarimäki
Publisher: Linköping University Electronic Press
ISBN: 9176858715
Category:
Page: 49
View: 4848
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Gas turbines are widely used in industry for power generation and as a power source at "hard to reach" locations where other possibilities for electrical supply are insufficient. There is a strong need for greener energy, considering the effect that pollution has had on global warming, and we need to come up with ways of producing cleaner electricity. A way to achieve this is by increasing the combustion temperature in gas turbines. This increases the demand on the high temperature performance of the materials used e.g. superalloys in the turbine. These high combustion temperatures can lead to detrimental degradation of critical components. These components are commonly subjected to cyclic loading of different types e.g. combined with dwell-times and overloads at elevated temperatures, which influence the crack growth. Dwell-times have shown to accelerate crack growth and change the cracking behaviour in both Inconel 718 and Haynes 282. Overloads at the beginning of the dwell-time cycle have shown to retard the dwell time effect on crack growth in Inconel 718. To understand these effects more microstructural investigations are needed. The work presented in this licentiate thesis was conducted under the umbrella of the research program Turbo Power; "High temperature fatigue crack propagation in nickel-based superalloys", concentrating on fatigue crack growth mechanisms in superalloys during dwell-times, which have shown to have a devastating effect on the crack propagation behaviour. Mechanical testing was performed under operation-like conditions in order to achieve representative microstructures and material data for the subsequent microstructural work. The microstructures were microscopically investigated in a scanning electron microscope (SEM) using electron channeling contrast imaging (ECCI) as well as using light optical microscopy. The outcome of this work has shown that there is a significant increase in crack growth rate when dwell-times are introduced at the maximum load (0% overload) in the fatigue cycle. With the introduction of a dwell-time there is also a shift from transgranular to intergranular crack growth for both Inconel 718 and Haynes 282. When an overload is applied prior to the dwell-time, the crack growth rate decreases with increasing overload levels in Inconel 718. At high temperature crack growth in Inconel 718 took place as intergranular crack growth along grain boundaries due to oxidation and the creation of nanometric voids. Another observed growth mechanism was crack advance along phase boundaries with subsequent severe oxidation of the phase.

Experimentelles Verfahren zur Charakterisierung des einachsigen Ermüdungsverhaltens auf Basis miniaturisierter Prüfkörper und Anwendung auf Hochtemperatur-Legierungen der Energietechnik


Author: Dirk Holländer
Publisher: Logos Verlag Berlin GmbH
ISBN: 383254500X
Category: Technology & Engineering
Page: 182
View: 3325
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Die vorliegende Arbeit beschreibt die Entwicklung und den Aufbau eines Miniaturproben-Prüfsystems, mit dem sowohl einachsige Zugversuche als auch niederzyklische Ermüdungsversuche unter Zug/Druck-Wechselbeanspruchung im Hochtemperatur-Bereich bis 1000 Grad Celsius durchgeführt werden können. Ausgehend von einer detaillierten Beschreibung des Versuchsaufbaus wird dessen Qualifizierung und Validierung anhand von drei Versuchswerkstoffen - dem austenitischen Edelstahl AISI 316L, der Nickelbasis-Superlegierungen Waspaloy und IN738LC - gezeigt. Im Vergleich zu Standardproben-Versuchen derselben Materialcharge und Literaturdaten konnte bei den feinkörnigen Versuchswerkstoffen AISI 316L und Waspaloy eine sehr gute Übereinstimmung zwischen den Versuchsdaten festgestellt werden. Dagegen wurde in Versuchen mit Miniaturproben aus der grobkörnigen Nickelbasis-Superlegierung IN738LC ein Probengrößen-Effekt festgestellt. Des Weiteren wird die Anwendbarkeit der Prüfmethodik für die Restlebensdauerbewertung betriebsbeanspruchter Gasturbinen-Laufschaufeln (Werkstoff: IN738LC) einer stationären Gasturbinenanlage gezeigt. Im Ergebnis von Zugversuchen und niederzyklischen Ermüdungsversuchen bei 850 Grad Celsius konnte ein signifikanter Lebensdauerverbrauch nachgewiesen werden, der auf betriebsbedingte Mikrostrukturveränderungen zurückzuführen ist.

Metalle

Struktur und Eigenschaften der Metalle und Legierungen
Author: Erhard Hornbogen,Hans Warlimont,Birgit Skrotzki
Publisher: Springer-Verlag
ISBN: 3662577631
Category: Technology & Engineering
Page: 424
View: 2218
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Metalle mit ihren vielfältigen nützlichen Eigenschaften sind eine der wichtigsten Werkstoffgruppen. Ob elektrische und thermische Leitfähigkeit, Glanz, plastische Verformbarkeit oder auch chemische Beständigkeit – die charakteristischen Eigenschaften von Metallen lassen sich aus ihrem elektronischen Zustand ableiten. Das Buch führt in das interdisziplinäre Fachgebiet der Metallkunde ein und verbindet die Darstellung der physikalischen Struktur und der physiko-chemischen Eigenschaften der Metalle mit ihrer Anwendung als Werkstoffe. Die Autoren beschreiben im ersten, wissenschaftlichen Teil den atomaren und mikroskopischen Aufbau, die thermodynamischen und die grundlegenden physikalischen und mechanischen Eigenschaften der Metalle sowie die Grundlagen der thermisch aktivierten Reaktionen und der Phasenumwandlungen. Die wichtigsten experimentellen Untersuchungsmethoden werden erläutert, wobei die mikroskopischen und Beugungsverfahren einen Schwerpunkt bilden. Im zweiten, technischen Teil werden die Werkstoffgruppen der Metalle und ihre anwendungsbezogenen Eigenschaften behandelt. Dabei wird auf die zugrunde liegenden Legierungen und die Verfahren zur gezielten Einstellung ihrer Eigenschaften eingegangen. Schwerpunkte bei der Darstellung der Werkstoffe sind die Stähle, die teilchengehärteten Legierungen, die Magnetwerkstoffe und die pulvermetallurgisch hergestellten Werkstoffe. Außerdem werden die Oberflächeneigenschaften und die Verfahren zur Oberflächenbehandlung dargestellt. Das Buch wurde für die 7. Auflage gründlich überbearbeitet und aktualisiert. Das Kapitel Mechanische Eigenschaften wurde um das mechanische Verhalten bei hoher Temperatur stark erweitert und die berücksichtigt nun die einschlägigen Normen der Werkstoffprüfung. Das Kapitel Erstarrung wurde um die additive (generative) Fertigung ergänzt, die in den letzten Jahren als computerbasiertes Fertigungsverfahren Einzug in die Produktionstechnik gehalten hat. Als kompaktes Standardwerk eignet sich das Fachbuch sowohl für die berufliche Praxis als auch für das Studium an Universität und Hochschule. Dort richtet es sich an Studierende der Natur- und Ingenieurwissenschaften, insbesondere der Werkstoffwissenschaften.

Superalloys 1984

Proceedings of the Fifth International Symposium on Superalloys Sponsored by the High Temperature Alloys Committee of the Metallurgical Society of AIME, Held October 7-11, 1984, Seven Springs Mountain Resort, Champion, Pennsylvania
Author: Maurice Gell
Publisher: Tms
ISBN: N.A
Category: Alloys
Page: 826
View: 8388
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Handbook of Crystal Growth

Bulk Crystal Growth
Author: Peter Rudolph
Publisher: Elsevier
ISBN: 0444633065
Category: Science
Page: 1418
View: 9347
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Vol 2A: Basic Technologies Handbook of Crystal Growth, 2nd Edition Volume IIA (Basic Technologies) presents basic growth technologies and modern crystal cutting methods. Particularly, the methodical fundamentals and development of technology in the field of bulk crystallization on both industrial and research scales are explored. After an introductory chapter on the formation of minerals, ruling historically the basic crystal formation parameters, advanced basic technologies from melt, solution, and vapour being applied for research and production of the today most important materials, like silicon, semiconductor compounds and oxides are presented in detail. The interdisciplinary and general importance of crystal growth for human live are illustrated. Vol 2B: Growth Mechanisms and Dynamics Handbook of Crystal Growth, 2nd Edition Volume IIB (Growth Mechanisms and Dynamics) deals with characteristic mechanisms and dynamics accompanying each bulk crystal growth method discussed in Volume IIA. Before the atoms or molecules pass over from a position in the fluid medium (gas, melt or solution) to their place in the crystalline face they must be transported in the fluid over macroscopic distances by diffusion, buoyancy-driven convection, surface-tension-driven convection, and forced convection (rotation, acceleration, vibration, magnetic mixing). Further, the heat of fusion and the part carried by the species on their way to the crystal by conductive and convective transport must be dissipated in the solid phase by well-organized thermal conduction and radiation to maintain a stable propagating interface. Additionally, segregation and capillary phenomena play a decisional role for chemical composition and crystal shaping, respectively. Today, the increase of high-quality crystal yield, its size enlargement and reproducibility are imperative conditions to match the strong economy. Volume 2A Presents the status and future of Czochralski and float zone growth of dislocation-free silicon Examines directional solidification of silicon ingots for photovoltaics, vertical gradient freeze of GaAs, CdTe for HF electronics and IR imaging as well as antiferromagnetic compounds and super alloys for turbine blades Focuses on growth of dielectric and conducting oxide crystals for lasers and non-linear optics Topics on hydrothermal, flux and vapour phase growth of III-nitrides, silicon carbide and diamond are explored Volume 2B Explores capillarity control of the crystal shape at the growth from the melt Highlights modeling of heat and mass transport dynamics Discusses control of convective melt processes by magnetic fields and vibration measures Includes imperative information on the segregation phenomenon and validation of compositional homogeneity Examines crystal defect generation mechanisms and their controllability Illustrates proper automation modes for ensuring constant crystal growth process Exhibits fundamentals of solution growth, gel growth of protein crystals, growth of superconductor materials and mass crystallization for food and pharmaceutical industries

Mechanical Alloying

Fundamentals and Applications
Author: P. R. Soni
Publisher: Cambridge Int Science Publishing
ISBN: 1898326568
Category: Science
Page: 151
View: 8837
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Annotation ContentsIntroduction (history, benefits of mechanical alloying); Mechanical alloying (alloying mills, mills in practice, improved mills, the process, parameters); Variations of mechanical alloying (reaction milling, cryomilling, repeated rolling, double mechanical alloying, repeated forging); Process controlagents in MA; (ductile-ductile system, ductile-brittle system, brittle-brittle system, metastable phase formation, amorphisation, nanocrystallization, extension of solid solubility, activation of solid state chemical interaction); Energy transfer and energy maps; Consolidation of mechanically alloyed powders (consolidation techniques, thermomechanical treatment); Mechanical properties of mechanically alloyed materials (tensile properties, fracture, creep, stress corrosion cracking susceptibility); Modelling MA (mechanistic models, deformation, coalescence and fragmentation, evolution of particle size, milling time, powder heating, powder cooling, atomistic model, thermodynamic and kinetic model)Joining of mechanically alloyed materials; Rapid solidification and mechanical alloying; Applications (nickel-based superalloys, AI-based materials, supersaturated solutions, magnetic materials, mechanically alloyed powders for spray coatings, superplasticity, tribological materials, composites, amorphous solids, nanocrystalline materials, solid-state chemical reactions, etc).

Fundamentals of Creep in Metals and Alloys


Author: Michael Ernest Kassner
Publisher: Elsevier Science
ISBN: N.A
Category: Technology & Engineering
Page: 295
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Previous ed.: Amsterdam; Oxford: Elsevier, 2004.

Cold and Hot Forging

Fundamentals and Applications
Author: Taylan Altan,Gracious Ngaile,Gangshu Shen
Publisher: ASM International
ISBN: 1615030948
Category: Technology & Engineering
Page: 341
View: 6636
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Editors Altan (Ohio State University), Ngaile (North Carolina University), and Shen (Ladish Company, Inc.) offer this extensive overview of the latest developments in the design of forging operations and dies. Basic technological principles are briefly reviewed in the first two chapters.

Titanium and Titanium Alloys

Fundamentals and Applications
Author: Christoph Leyens,Manfred Peters
Publisher: John Wiley & Sons
ISBN: 3527605207
Category: Technology & Engineering
Page: 532
View: 5131
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This handbook is an excellent reference for materials scientists and engineers needing to gain more knowledge about these engineering materials. Following introductory chapters on the fundamental materials properties of titanium, readers will find comprehensive descriptions of the development, processing and properties of modern titanium alloys. There then follows detailed discussion of the applications of titanium and its alloys in aerospace, medicine, energy and automotive technology.

High-Entropy Alloys

Fundamentals and Applications
Author: Michael C. Gao,Jien-Wei Yeh,Peter K. Liaw,Yong Zhang
Publisher: Springer
ISBN: 3319270133
Category: Technology & Engineering
Page: 516
View: 6412
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This book provides a systematic and comprehensive description of high-entropy alloys (HEAs). The authors summarize key properties of HEAs from the perspective of both fundamental understanding and applications, which are supported by in-depth analyses. The book also contains computational modeling in tackling HEAs, which help elucidate the formation mechanisms and properties of HEAs from various length and time scales.

Frontiers of materials science


Author: Tomohiro Akiyama
Publisher: Ios PressInc
ISBN: 9781586038045
Category: Technology & Engineering
Page: 269
View: 2568
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Summary: "The book covers a wide area ranging from the basic principles familiar in materials science and engineering to practical applications and is expected to serve as a first course text for graduate students, researchers, and engineers engaged in this field. Some chapters are added on the novel materials processing operations and recent topics attracting deep interest of researchers and engineers in the iron and steel industry. Chapter 1 provides information on the stability and time evolution of microstructure in metals and the related principles in statistical thermodynamics. Chapter 2 presents the structure and properties of anodic films on aluminum and micro- and nano-technologies based on anodizing. Chapter 3 is devoted to explain the hydrogen behavior in BCC metals. Chapter 4 describes some features of high-temperature oxidation and corrosion of metals and alloys used in, for example, engines and turbines working at very high temperatures. Chapter 5 is concerned with advanced high-temperature energy materials such as heat resistant ferritic steel and ODS ferritic steel. In Chapter 6 we introduce the basic principles in corrosion engineering. We describe the development of microstructure and its design in Chapter 7 focusing on the solidification of molten metal, peritectic reaction under supercooling condition and grain growth. Chapter 8 treats transport phenomena occurring in the conventional steelmaking reactors such as the converter and ladle. In Chapter 9 we describe environment-friendly titanium with special emphasis on its characteristics, resources, industrial production process currently used, and new production processes. Chapter 10 discusses how to recuperate material and energy for an ecological network."--Publisher description.

American Book Publishing Record


Author: N.A
Publisher: N.A
ISBN: N.A
Category: American literature
Page: N.A
View: 5933
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Surface Engineering 2001 - Fundamentals and Applications:


Author: Wen Jin Meng,Ashok Kumar,Gary L. Doll,Yang-Tse Cheng,Stan Veprek,Yip-Wah Chung
Publisher: Cambridge University Press
ISBN: 9781558996335
Category: Technology & Engineering
Page: 451
View: 6805
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Representing a relatively new and interdisciplinary field, this book explores the linkages between surface engineering and tribology across engineering fields, from the MEMs industry to the traditional machinery industry, to the transportation industry. While the characteristic size of the respective mechanical systems varies from nano- to tens of meters, overall performance critically depends on the near-surface mechanical, thermal and tribological behavior. Advances in surface engineering technologies enable surfaces with superior wear resistance, friction behavior and corrosion characteristics, without altering the desired bulk mechanical properties. This provides opportunities to engineer next-generation mechanical systems well beyond the current performance envelope. A better understanding of the tribological behavior of engineered surfaces is the key to the future success of many new (e.g. MEMS) and old (e.g. machinery and transportation) industries. Advances on surface engineering materials, technologies and tribology are addressed in the book, as are numerical simulations and modeling related to the same issues.

Aerospace Materials Handbook


Author: Sam Zhang,Dongliang Zhao
Publisher: CRC Press
ISBN: 1439873305
Category: Technology & Engineering
Page: 781
View: 884
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Whether an airplane or a space shuttle, a flying machine requires advanced materials to provide a strong, lightweight body and a powerful engine that functions at high temperature. The Aerospace Materials Handbook examines these materials, covering traditional superalloys as well as more recently developed light alloys. Capturing state-of-the-art developments in materials research for aeronautical and aerospace applications, this book provides a timely reference for both newcomers and veteran researchers in the field. The chapters address developments in bulk materials, coatings, traditional materials, and new materials. Beginning with an overview of superalloys, including nickel-, nickel–iron-, and cobalt-based superalloys, the text covers machining, laser cladding and alloying, corrosion performance, high-temperature oxidation, thermal spraying, and nanostructured coatings. It also includes four categories of composites used in aerospace: metal matrix, polymer, carbon nanotube-reinforced polymer, and self-healing composites. The text describes preparation, processing, and fatigue of lightweight magnesium alloys, as well as an exciting new class of materials—aerogels. This book brings readers to the cutting edge of research in materials for aerospace and aeronautics. It provides an entry point into this field and presents details to stimulate future research. This unique, up-to-date resource offers knowledge to enable practitioners to develop faster, more efficient, and more reliable air- and spacecraft.

Advanced High-Strength Steels

Science, Technology, and Applications
Author: Mahmoud Y. Demeri
Publisher: ASM International
ISBN: 1627080058
Category: Electronic books
Page: 312
View: 4864
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Examines the types, microstructures and attributes of AHSSAlso reviews the current and future applications, the benefits, trends and environmental and sustainability issues.

The processing, properties and applications of metallic and ceramic materials

proceedings of an international conference held at the International Convention Centre Birmingham, UK, 7-10th Sept. 92
Author: C. J. Beevers,M. H. Loretto
Publisher: N.A
ISBN: 9780947817558
Category: Technology & Engineering
Page: 1254
View: 7514
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Fundamentals of materials science and engineering

an integrated approach
Author: William D. Callister
Publisher: Wiley
ISBN: 9780471470144
Category: Science
Page: 824
View: 6591
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This Second Edition of Fundamentals of Materials Science and Engineering continues to take an integrated approach to the topic organization. One specific structure, characteristic, or property type at a time is discussed for all three basic material types--metals, ceramics, and polymeric materials. This order of presentation allows for early introduction of non-metals and supports the engineer's role of choosing a material based on its characteristics. New copies of this text include a CD at no additional charge. The CD is an integral part of the text package and features animated software modules and the last five text chapters in .pdf format.

Wcs Fundamentals of Materials Science

An Interactive Etest Chapters 15-20
Author: William D. Callister
Publisher: John Wiley & Sons Incorporated
ISBN: 9780471201014
Category: Technology & Engineering
Page: 206
View: 8113
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