Download or read book Fatigue Sensitivity to Small Defects of a Gamma Titanium Aluminide Alloy written by Mauro Filippini and published by . This book was released on 2012 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fatigue properties of a Ti-48Al-2Cr-2Nb alloy obtained by electron-beam melting (EBM) with a patented process has been examined by conducting high cycle fatigue tests performed at different R ratios at room temperature. Fatigue-crack propagation tests have been performed for the purpose of characterizing the fatigue-crack growth rate and threshold of the material. Additionally, specimens with artificially introduced defects have been fatigue tested with the objective of studying the growth behavior of small cracks. Artificial defects with different sizes have been generated in the gauge section of the specimens by electron-discharge machining (EDM). After EDM defects are produced, the specimens are pre-cracked in cyclic compression, so that small cracks can be generated at the root of the EDM starter defects. Fatigue tests are conducted by applying the staircase technique with the number of cycles of censored test (runout) fixed at 107 cycles. By employing the Murakami model for the calculation of the range of stress intensity factor, the threshold stress intensity factor range dependence on the loading ratio R and on the defect size is evaluated, highlighting the relevant parameters that govern the specific mechanisms of failure of the novel ?-TiAl alloy studied in the present work.
Download or read book Effects of Conventional Machining on High Cycle Fatigue Behavior of the Intermetallic Alloy Ti 47 Al 2Nb 2Cr at written by Peggy Ellis Jones and published by . This book was released on 1997 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low cycle Fatigue Properties and Microstructure of Two gamma titanium Aluminide Alloys Containing TiB2 particles written by and published by . This book was released on 1999 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Mechanical Fatigue Testing of a Titanium Aluminide Alloy written by John J. Pernote and published by . This book was released on 1987 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a continuing need to study the affect of combined thermal and mechanical cycling of materials. This combined cycling is referred to as thermal-mechanical fatigue (TMF) cycling. This study emphasizes the development of a computer-controlled testing system that can mechanically fatigue a specimen under a variety of thermal conditions. These conditions include isothermal temperatures, as well as cyclic temperatures in phase (IP) or out of phase (OP) with the load. To demonstrate the capability of this system, both a 1200 F isothermal load fatigue test and a 600 F to 1200 F IP TMF test were carried out on a titanium-aluminide alloy, Ti3AL. Crack growth relations were established for both cases by plotting the da/dN versus Delta K data on log-log axis and fitting the power law relations, da/dN = C (Delta K) superscript n to the data. The results show the crack growth rate for the isothermal test is slightly high than the growth rate for the IP TMF test at a given value of stress intensity range, Delta K. The crack surfaces were very rough and crack growth was not along the mid-plane of the specimen.
Download or read book Frequency and Mean Stress Effects in High Cycle Fatigue of Ti 6A1 4V written by Ryan J. Morrissey and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this project was to extend past research on fatigue of Ti-6Al-4V into conditions which more closely reflect actual use conditions. This included testing at a range of frequencies (70, 400, 1800 Hz) to determine the effect of frequency on the fatigue strength. In addition, testing was performed at various stress ratios (0.1, 0.5, 0.8) to determine the effects of mean stress on the HCF performance of Ti-6A1-4V. This included an examination of the effects of cyclic and time-dependent strain accumulation on the fracture mode at high mean stresses. Frequency effects were observed at low stress ratios, resulting in higher fatigue strengths as the frequency increased. Possible causes include strain rate effects on dislocation motion, loss of active primary slip systems at high frequencies in hexagonal close-packed and body-centered cubic materials, and environmental damage. Results obtained at high mean stress show that the behavior of Ti-6A1-4V consists of a complex combination of fatigue, cyclic creep, and strain ratchetting. Fractographic analysis combined with cyclic creep studies were used to further define the mechanisms which led to the observed behavior.
Download or read book Data sheet on fracture toughness and high cycle fatigue properties of Ti 5Al 2 5Sn ELI alloy o 160billet at cryogenic temperatures written by and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue Crack Growth Behavior of Titanium Aluminide Ti 25Al 25Nb written by SJ. Balsone and published by . This book was released on 1993 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fatigue crack growth rate of an orthorhombic + beta titanium aluminide, nominally Ti-25Al-25Nb, was studied as a function of temperature (25 to 750°C), environment (air and vacuum), frequency (0.001 to 1.0 Hz), and superimposed hold times (1 to 1000 s) under computer-controlled constant Kmax testing conditions. In addition, fatigue crack growth rates from the near-threshold region to rates greater than approximately 10-7 m/cycle were determined at room and elevated temperatures. Results show that the fatigue crack growth rate exhibits a combination of cycle- and time-dependent behavior and is sensitive to environment over the entire temperature range. At elevated temperature, crack growth per cycle is found to increase with decreasing frequency in both laboratory air and vacuum, suggesting a contribution from environmentally assisted crack growth. Growth rates in vacuum are as much as an order of magnitude lower than those obtained in air. Further, hold times of increasing duration are found to slightly decrease and then increase the crack growth rate at elevated temperature. At elevated temperatures, crack growth behavior appears to be a complex interaction of environmental degradation at the crack tip, crack-tip blunting due to creep, and cyclic fatigue (resharpening of the crack tip). An attempt was made to correlate the observed fatigue crack growth rates with the mechanism, or mechanisms, of fracture. The crack growth characteristics were compared with those of the alpha-2 titanium aluminide, Ti-24Al-11 Nb, and a conventional high-temperature titanium alloy, Ti-1100.
Download or read book Effect of Microstructures on Low Cycle Fatigue Behavior in a TC6 Ti 6AI 2 5Mo 2Cr 0 5Fe 0 3Si Titanium Alloy written by Zhang SQ and published by . This book was released on 1988 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of an investigation on the low cycle fatigue (LCF) behavior, at room temperature and 400°C for four conventional microstructures (Widmannstatten, basket-weave, equiaxed, and duplex) in a TC6 titanium alloy are presented. The fatigue crack nucleation and propagation in fatigue-tested specimens have been observed by scanning electron microscopy (SEM). The duplex microstructure is associated with the longest LCF life at room temperature and 400°C, while the Widmannstatten microstructure has the shortest. The crack initiation sites and propagation paths were examined and discussed. The cracks primarily initiated along slip bands on the specimen surface for all four microstructures. In addition, many voids appeared along slip bands for the equiaxed microstructure. By linking-up these voids, the formation of microcracks is realized. The propagation of interior cracks in specimens with Widmannstatten structure proceeded by cross-cutting W? platelets by way of a plastic blunting mechanism, whereas for the equiaxed microstructure interior cracks grew by the linking-up of voids by way of a renucleation mechanism.
Download or read book Additive Manufacturing of Titanium Alloys written by Bhaskar Dutta and published by Butterworth-Heinemann. This book was released on 2016-06-17 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additive Manufacturing of Titanium Alloys: State of the Art, Challenges and Opportunities provides alternative methods to the conventional approach for the fabrication of the majority of titanium components produced via the cast and wrought technique, a process which involves a considerable amount of expensive machining. In contrast, the Additive Manufacturing (AM) approach allows very close to final part configuration to be directly fabricated minimizing machining cost, while achieving mechanical properties at least at cast and wrought levels. In addition, the book offers the benefit of significant savings through better material utilization for parts with high buy-to-fly ratios (ratio of initial stock mass to final part mass before and after manufacturing). As titanium additive manufacturing has attracted considerable attention from both academicians and technologists, and has already led to many applications in aerospace and terrestrial systems, as well as in the medical industry, this book explores the unique shape making capabilities and attractive mechanical properties which make titanium an ideal material for the additive manufacturing industry. Includes coverage of the fundamentals of microstructural evolution in titanium alloys Introduces readers to the various Additive Manufacturing Technologies, such as Powder Bed Fusion (PBF) and Directed Energy Deposition (DED) Looks at the future of Titanium Additive Manufacturing Provides a complete review of the science, technology, and applications of Titanium Additive Manufacturing (AM)
Download or read book Ti 2011 Proceedings of the 12th World Conference on Titanium written by World Conference on Titanium and published by . This book was released on 2012 with total page 2271 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue of Materials and Structures written by Claude Bathias and published by John Wiley & Sons. This book was released on 2013-03-04 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Gamma Titanium Aluminides written by Young-Won Kim and published by Minerals, Metals, & Materials Society. This book was released on 1995 with total page 1036 pages. Available in PDF, EPUB and Kindle. Book excerpt: This two-volume publication is a comprehensive update of the fundamental and practical issues confronting the research, development and application of gamma titanium aluminides.
Download or read book Structural Intermetallics written by International Symposium on Structural Intermetallics and published by . This book was released on with total page 916 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Powder Metallurgy of Titanium written by Ma Qian and published by Trans Tech Publications Ltd. This book was released on 2012-08-24 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: The conference upon which this work is based fully achieved its objectives and turned out to be the largest international gathering dedicated solely to the topic of titanium processing via powder metallurgy. Volume is indexed by Thomson Reuters CPCI-S (WoS). The 50 peer-reviewed papers are grouped into 8 chapters: PM titanium alloy design and processing developments; Powder Production; Effect of Impurities; Metal Injection Moulding of Titanium; Biomedical Titanium Alloys; Titanium Composites; Forging and Equal-Channel Angular Pressing of Titanium; Laser Cladding, Welding, Slip Casting and Other Processing Developments.
Download or read book Aerodynamics written by Mofid Gorji-Bandpy and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Age hardenable Aluminium Alloys written by István Kovács and published by . This book was released on 1987 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents more than 60 papers on various topics of current interest, concerning the development of new types of alloys, trace elements, analytical techniques, the physics of the decomposition process, dislocation structure and technological applications.
Download or read book Development and Application of Biomedical Titanium Alloys written by Liqiang Wang and published by Bentham Science Publishers. This book was released on 2018-04-05 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium and its alloys have been widely used as biomedical implant materials due to their low density, good mechanical properties, superior corrosion resistance and biocompatibility when compared with other metallic biomaterials such as Co–Cr alloys and stainless steels. Recently, β-type titanium alloys have been increasingly considered as excellent implant materials because of the remarkable combination of high strength-to-weight ratio, good fatigue resistance, relatively low Young's modulus, good biocompatibility and high corrosion resistance relative to conventional titanium biomaterials. This book covers recent information about biomedical titanium alloy development and 3D printing. Chapters describe the processing, microstructure, mechanical properties and corrosion properties in detail. Information about the surface modification of titanium alloys for biomedical applications, and manufacturing of titanium alloys by new technologies (such as selective laser melting and electron beam melting), is also presented. Readers will learn about the various types of biomedical titanium alloys, their advantages and disadvantages, their fabrication methods and medical applications. This book is a useful handbook for biomedical engineers, metallurgists and biotechnicians seeking information about titanium-based alloys for biomaterials research and development.
