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The Effect Of Carbide Morphology On Elevated Temperature Ductility In Nickel Base Superalloys
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Book Synopsis The Effect of Carbide Morphology on Elevated Temperature Ductility in Nickel Base Superalloys by : Walter A. Johnson
Download or read book The Effect of Carbide Morphology on Elevated Temperature Ductility in Nickel Base Superalloys written by Walter A. Johnson and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alloy Design and Characterization of γ′ Strengthened Nickel-based Superalloys for Additive Manufacturing by : Jinghao Xu
Download or read book Alloy Design and Characterization of γ′ Strengthened Nickel-based Superalloys for Additive Manufacturing written by Jinghao Xu and published by Linköping University Electronic Press. This book was released on 2021-01-28 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nickel-based superalloys, an alloy system bases on nickel as the matrix element with the addition of up to 10 more alloying elements including chromium, aluminum, cobalt, tungsten, molybdenum, titanium, and so on. Through the development and improvement of nickel-based superalloys in the past century, they are well proved to show excellent performance at the elevated service temperature. Owing to the combination of extraordinary high-temperature mechanical properties, such as monotonic and cyclic deformation resistance, fatigue crack propagation resistance; and high-temperature chemical properties, such as corrosion and oxidation resistance, phase stability, nickel-based superalloys are widely used in the critical hot-section components in aerospace and energy generation industries. The success of nickel-based superalloy systems attributes to both the well-tailored microstructures with the assistance of carefully doped alloying elements, and the intently developed manufacturing processes. The microstructure of the modern nickel-based superalloys consists of a two-phase configuration: the intermetallic precipitates (Ni,Co)3(Al,Ti,Ta) known as γ′ phase dispersed into the austenite γ matrix, which is firstly introduced in the 1940s. The recently developed additive manufacturing (AM) techniques, acting as the disruptive manufacturing process, offers a new avenue for producing the nickel-based superalloy components with complicated geometries. However, γ′ strengthened nickel-based superalloys always suffer from the micro-cracking during the AM process, which is barely eliminated by the process optimization. On this basis, the new compositions of γ′ strengthened nickel-based superalloy adapted to the AM process are of great interest and significance. This study sought to design novel γ′ strengthened nickel-based superalloys readily for AM process with limited cracking susceptibility, based on the understanding of the cracking mechanisms. A two-parameter model is developed to predict the additive manufacturability for any given composition of a nickel-based superalloy. One materials index is derived from the comparison of the deformation-resistant capacity between dendritic and interdendritic regions, while another index is derived from the difference of heat resistant capacity of these two spaces. By plotting the additive manufacturability diagram, the superalloys family can be categorized into the easy-to-weld, fairly-weldable, and non-weldable regime with the good agreement of the existed knowledge. To design a novel superalloy, a Cr-Co-Mo-W-Al-Ti-Ta-Nb-Fe-Ni alloy family is proposed containing 921,600 composition recipes in total. Through the examination of additive manufacturability, undesired phase formation propensity, and the precipitation fraction, one composition of superalloy, MAD542, out of the 921,600 candidates is selected. Validation of additive manufacturability of MAD542 is carried out by laser powder bed fusion (LPBF). By optimizing the LPBF process parameters, the crack-free MAD542 part is achieved. In addition, the MAD542 superalloy shows great resistance to the post-processing treatment-induced cracking. During the post-processing treatment, extensive annealing twins are promoted to achieve the recrystallization microstructure, ensuring the rapid reduction of stored energy. After ageing treatment, up to 60-65% volume fraction of γ′ precipitates are developed, indicating the huge potential of γ′ formation. Examined by the high-temperature slow strain rate tensile and constant loading creep testing, the MAD542 superalloy shows superior strength than the LPBF processed and hot isostatic pressed plus heat-treated IN738LC superalloy. While the low ductility of MAD542 is existed, which is expected to be improved by modifying the post-processing treatment scenarios and by the adjusting building direction in the following stages of the Ph.D. research. MAD542 superalloy so far shows both good additive manufacturability and mechanical potentials. Additionally, the results in this study will contribute to a novel paradigm for alloy design and encourage more γ′-strengthened nickel-based superalloys tailored for AM processes in the future.
Book Synopsis Strengthening Mechanisms in Nickel-base High-temperature Alloys by : C. H. Lund
Download or read book Strengthening Mechanisms in Nickel-base High-temperature Alloys written by C. H. Lund and published by . This book was released on 1961 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Impact of Carbon on Single Crystal Nickel-base Superalloys by : Andrew Jay Wasson
Download or read book The Impact of Carbon on Single Crystal Nickel-base Superalloys written by Andrew Jay Wasson and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the B-containing alloy, heat treatment resulted in the transformation of script MC (M - metal, C - carbon) carbide networks into clusters of small, spherical MC carbides without a significant change in composition. Formation of topologically close packed phases during thermal exposure was suppressed in the B-containing alloy due the decomposition of primary MC carbides and the preferential formation of secondary M23C6 carbides. All of the modified alloys exhibited shorter creep rupture lifetimes than the baseline at all creep conditions (950 degrees C/300 MPa, 850 degrees C/550 MPa, 750 degrees C/800 MPa). The most significant decrease in lifetime occurred at the 750 degrees C condition due to large primary creep strains of up to nearly 10% in the C-containing alloys. In HCF testing at 850 degrees C, the presence of carbides and increased porosity led to reduced lifetimes in the modified alloys. HIP (hot isostatic pressing) processing significantly improved fatigue performance, accounting for average lifetime increases ranging from 77% to 4490% over Un-HIPed material. HIP also isolated the effect of carbide morphology on fatigue behavior by changing active crack initiation sites from pores to carbides.
Book Synopsis Powder Metallurgy of Superalloys by : G. H. Gessinger
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.
Book Synopsis Cobalt-base Superalloys - 1970 by : C. P. Sullivan
Download or read book Cobalt-base Superalloys - 1970 written by C. P. Sullivan and published by . This book was released on 1970 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Grain Boundary Segregation in Metals by : Pavel Lejcek
Download or read book Grain Boundary Segregation in Metals written by Pavel Lejcek and published by Springer Science & Business Media. This book was released on 2010-07-20 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Grain boundaries are important structural components of polycrystalline materials used in the vast majority of technical applications. Because grain boundaries form a continuous network throughout such materials, their properties may limit their practical use. One of the serious phenomena which evoke these limitations is the grain boundary segregation of impurities. It results in the loss of grain boundary cohesion and consequently, in brittle fracture of the materials. The current book deals with fundamentals of grain boundary segregation in metallic materials and its relationship to the grain boundary structure, classification and other materials properties.
Book Synopsis Superalloys by : Matthew J. Donachie
Download or read book Superalloys written by Matthew J. Donachie and published by ASM International. This book was released on 2002 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers virtually all technical aspects related to the selection, processing, use, and analysis of superalloys. The text of this new second edition has been completely revised and expanded with many new figures and tables added. In developing this new edition, the focus has been on providing comprehensive and practical coverage of superalloys technology. Some highlights include the most complete and up-to-date presentation available on alloy melting. Coverage of alloy selection provides many tips and guidelines that the reader can use in identifying an appropriate alloy for a specific application. The relation of properties and microstructure is covered in more detail than in previous books.
Book Synopsis Effect of Carbon Additions and Carbide Morphology on the Microstructure and Mechanical Properties of Ni-base Superalloys by : Elyssa R. Cutler
Download or read book Effect of Carbon Additions and Carbide Morphology on the Microstructure and Mechanical Properties of Ni-base Superalloys written by Elyssa R. Cutler and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In general, the highest creep lifetimes and lowest creep rates were seen in the HIP samples with 0.01 weight percent carbon. Fatigue samples were tested with a [delta] [sigma] of 690 MPa and a stress ratio of 0.1. The HIP treatment only improved lifetimes for the baseline, no carbon samples and the lowest carbon level of 0.01 weight percent.
Book Synopsis Nickel, Cobalt, and Their Alloys by : Joseph R. Davis
Download or read book Nickel, Cobalt, and Their Alloys written by Joseph R. Davis and published by ASM International. This book was released on 2000-01-01 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a comprehensive guide to the compositions, properties, processing, performance, and applications of nickel, cobalt, and their alloys. It includes all of the essential information contained in the ASM Handbook series, as well as new or updated coverage in many areas in the nickel, cobalt, and related industries.
Book Synopsis EDGE-NOTCH SENSITIVITY OF SHEET NICKEL-BASE SUPERALLOYS AS INFLUENCED BY MAGNESIUM AND CARBON by : Yancy E. Smith, James W. Freeman
Download or read book EDGE-NOTCH SENSITIVITY OF SHEET NICKEL-BASE SUPERALLOYS AS INFLUENCED BY MAGNESIUM AND CARBON written by Yancy E. Smith, James W. Freeman and published by . This book was released on 1967 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superalloys 2020 written by Sammy Tin and published by Springer Nature. This book was released on 2020-08-28 with total page 1098 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 14th International Symposium on Superalloys (Superalloys 2020) highlights technologies for lifecycle improvement of superalloys. In addition to the traditional focus areas of alloy development, processing, mechanical behavior, coatings, and environmental effects, this volume includes contributions from academia, supply chain, and product-user members of the superalloy community that highlight technologies that contribute to improving manufacturability, affordability, life prediction, and performance of superalloys.
Download or read book The Superalloys written by Roger C. Reed and published by Cambridge University Press. This book was released on 2008-07-31 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superalloys are unique high-temperature materials used in gas turbine engines, which display excellent resistance to mechanical and chemical degradation. This book introduces the metallurgical principles which have guided their development. Suitable for graduate students and researchers, it includes exercises and additional resources at www.cambridge.org/9780521859042.
Book Synopsis The Microstructure of Superalloys by : Madeleine Durand-Charre
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.
Book Synopsis A Study of Carbide Morphology and Room Temperature Tensile Properties in Nickel Alloy 718 by : Mark Charles Koopman
Download or read book A Study of Carbide Morphology and Room Temperature Tensile Properties in Nickel Alloy 718 written by Mark Charles Koopman and published by . This book was released on 1994 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Alloying written by Joseph R. Davis and published by ASM International. This book was released on 2001-01-01 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alloying: Understanding the Basics is a comprehensive guide to the influence of alloy additions on mechanical properties, physical properties, corrosion and chemical behavior, and processing and manufacturing characteristics. The coverage considers "alloying" to include any addition of an element or compound that interacts with a base metal to influence properties. Thus, the book addresses the beneficial effects of major alloy additions, inoculants, dopants, grain refiners, and other elements that have been deliberately added to improve performance, as well the detrimental effects of minor elements or residual (tramp) elements included in charge materials or that result from improper melting or refining techniques. The content is presented in a concise, user-friendly format. Numerous figures and tables are provided. The coverage has been weighted to provided the most detailed information on the most industrially important materials.
Book Synopsis TMS 2019 148th Annual Meeting & Exhibition Supplemental Proceedings by : The Minerals, Metals & Materials Series
Download or read book TMS 2019 148th Annual Meeting & Exhibition Supplemental Proceedings written by The Minerals, Metals & Materials Series and published by Springer. This book was released on 2019-02-27 with total page 1731 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection features papers presented at the 147th Annual Meeting & Exhibition of The Minerals, Metals & Materials Society.
