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Book THERMEC 2011

Download or read book THERMEC 2011 written by Tara Chandra and published by . This book was released on 2012 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Creep and Fracture of Engineering Materials and Structures

Download or read book Creep and Fracture of Engineering Materials and Structures written by T. Sakuma and published by . This book was released on 2000 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sampling of proceedings includes the following: (1) "Recent Developments in the Analysis of Creep Rupture Data"; (2) "Creep Crack Growth in Nearly Fully-Lamellar Gamma TiA1 Alloys"; (3) "Research of Welding Effect on Creep Damage of High Temperature Furnace Tubes"; (4) "The Reversibility of Creep Strain at Low Stresses and Low Temperatures"; (5) "Deformation Behavior of 7475 Aluminum Alloy at High Temperatures"; and (6) "Creep of Reinforced and Unreinforced AZ91 Magnesium Alloy."

Book Neutron Scattering in Materials Science II Volume 376

Download or read book Neutron Scattering in Materials Science II Volume 376 written by Dan A. Neumann and published by . This book was released on 1995 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron scattering proves itself a highly international area of research as scientists and engineers from twenty-one countries come together in this volume - to discuss the growth and maturation of the use of neutrons as a probe in materials research and to survey current applications. A wide range of materials are examined, including polymers, cements, high-Tc superconducting oxides and carbides, inorganic glasses, magnetic films, ceramics and metallic alloys. Topics include: instrumentation at major neutron facilities in North America; developments in instrumentation and techniques; neutron reflectivity studies of surfaces and interfaces; small angle neutron scattering (SANS) studies of polymers and complex fluids; SANS studies of ceramics and metals; residual stress analysis; cementitious materials; high-Tc superconducting materials; interfaces, multilayers and nanocrystals of magnetic materials; oxide materials; inorganic glasses; alloys; and adsorbed systems, inelastic scattering and dynamics.

Book The Effects of Microstructure and Strain Rate on the Deformation Behavior of the Nickel base Superalloy Rene 95 at 650 C

Download or read book The Effects of Microstructure and Strain Rate on the Deformation Behavior of the Nickel base Superalloy Rene 95 at 650 C written by Edie A. Oja and published by . This book was released on 1994 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Creep Behavior of Advanced Materials for the 21st Century

Download or read book Creep Behavior of Advanced Materials for the 21st Century written by Rajiv S. Mishra and published by Minerals, Metals, & Materials Society. This book was released on 1999 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume reviews and updates the creep behavior of advanced materials, including ceramic and metal-matrix composites, laminated materials, nanostructured materials, advanced intermetallics, and advanced dispersion strengthened materials. This collection from the 1999 TMS Annual Meeting & Exhibition also covers the influence of microstructure on various aspects of creep and how this knowledge can be used to design more creep resistant materials.

Book Creep and Microstructure Evolution in Nickel Superalloys

Download or read book Creep and Microstructure Evolution in Nickel Superalloys written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Creep deformation in nickel base superalloy single crystals

Download or read book Creep deformation in nickel base superalloy single crystals written by Tresa Mader Pollock and published by . This book was released on 1989 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Effects of Microstructural Parameters on Creep of Nickel Base Superalloy Single Crystals

Download or read book Effects of Microstructural Parameters on Creep of Nickel Base Superalloy Single Crystals written by National Aeronaut Administration (Nasa) and published by . This book was released on 2020-08-05 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microstructure-sensitive creep models have been developed for Ni-base superalloy single crystals. Creep rupture testing was conducted on fourteen single crystal alloys at two applied stress levels at each of two temperatures, 982 and 1093 C. The variation in creep lives among the different alloys could be explained with regression models containing relatively few microstructural parameters. At 982 C, gamma-gamma prime lattice mismatch, gamma prime volume fraction, and initial gamma prime size were statistically significant in explaining the creep rupture lives. At 1093 C, only lattice mismatch and gamma prime volume fraction were significant. These models could explain from 84 to 94 percent of the variation in creep lives, depending on test condition. Longer creep lives were associated with alloys having more negative lattice mismatch, lower gamma prime volume fractions, and finer gamma prime sizes. The gamma-gamma prime lattice mismatch exhibited the strongest influence of all the microstructural parameters at both temperatures. Although a majority of the alloys in this study were stable with respect to topologically close packed (TCP) phases, it appeared that up to approximately 2 vol% TCP phase did not affect the 1093 C creep lives under applied stresses that produced lives of approximately 200 to 300 h. In contrast, TCP phase contents of approximately 2 vol% were detrimental at lower applied stresses where creep lives were longer. A regression model was also developed for the as-heat treated initial gamma prime size; this model showed that gamma prime solvus temperature, gamma-gamma prime lattice mismatch, and bulk Re content were all statistically significant. MacKay, Rebecca A. and Gabb, Timothy P. and Nathal, Michael V. Glenn Research Center NASA/TM-2013-217868, E-18666 WBS 473452.02.03.05.04.01.01 NICKEL ALLOYS; MICROSTRUCTURE; SINGLE CRYSTALS; CREEP PROPERTIES; HEAT RESISTANT ALLOYS; CREEP TESTS; REGRESSION ANALYSIS; CRYSTAL LATTICES; CLOSE PACKED LATTICES; TURBINE BLADES; MATHEMATICAL MODELS; HIGH TEMPERATURE; CONCENTRATION (COMPOSITION); TEMPERATURE DEPENDENCE

Book Microstructure Property Relationships in Directionally Solidified Single Crystal Nickel Base Superalloys

Download or read book Microstructure Property Relationships in Directionally Solidified Single Crystal Nickel Base Superalloys written by RA. MacKay and published by . This book was released on 1988 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper discusses some of the microstructural features which influence the creep properties of directionally solidified and single-crystal nickel-base superalloys. Gamma prime precipitate size and morphology, ?-?' lattice mismatch, phase instability, alloy composition, and processing variations are among the factors considered. Recent experimental results are reviewed and related to the operative deformation mechanisms and to the corresponding mechanical properties. Special emphasis is placed on the creep behavior of single-crystal superalloys at high temperatures, where directional ?' coarsening is prominent, and at lower temperatures, where ?' coarsening rates are significantly reduced. It can be seen that very subtle changes in microstructural features can have profound effects on the subsequent properties of these materials.

Book An Integrated Study of the Stress strain and Creep Behaviour of a Nickel Base Superalloy

Download or read book An Integrated Study of the Stress strain and Creep Behaviour of a Nickel Base Superalloy written by Russell Roy Jensen and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Metals Abstracts

Download or read book Metals Abstracts written by and published by . This book was released on 1996 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book International Aerospace Abstracts

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1996 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Alloy Design and Characterization of Strengthened Nickel based Superalloys for Additive Manufacturing

Download or read book Alloy Design and Characterization of 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.