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Corrosion And Environment Assisted Cracking Behavior Of Friction Stir Welded Al 2195 And Al 2219 Alloys
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Book Synopsis Corrosion and Environment-assisted Cracking Behavior of Friction Stir Welded Al 2195 and Al 2219 Alloys by : Wusheng Hu
Download or read book Corrosion and Environment-assisted Cracking Behavior of Friction Stir Welded Al 2195 and Al 2219 Alloys written by Wusheng Hu and published by . This book was released on 2000 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Corrosion and Stress Corrosion Testing of Aerospace Vehicle Structural Alloys by : Russell Wanhill
Download or read book Corrosion and Stress Corrosion Testing of Aerospace Vehicle Structural Alloys written by Russell Wanhill and published by Springer. This book was released on 2018-05-24 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: This SpringerBrief discusses the determination and classification of the ambient temperature corrosion and stress corrosion properties of aerospace structural alloys, with emphasis on (1) aluminium alloys, modern (3rd generation) aluminium‒lithium alloys, stainless steels and titanium alloys and (2) some of the issues involved. Standard /reference data on environmental properties, including corrosion and stress corrosion, are mandatory for the qualification and certification of materials for aerospace vehicles, and also for the design of actual structures and components. Recommendations for further testing and evaluation are given at appropriate points in the text. The book concludes with a summary of the main topics.
Book Synopsis A Study of Friction Stir Welded 2195 Al-Li Alloy by the Scanning Reference Electrode Technique by : Merlin D. Danford
Download or read book A Study of Friction Stir Welded 2195 Al-Li Alloy by the Scanning Reference Electrode Technique written by Merlin D. Danford and published by . This book was released on 1998 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the corrosion of friction stir welded 2195 Al-Li alloy has been carried out using the scanning reference electrode technique (SRET). The results are compared to those obtained from a study of heterogeneously welded samples.
Book Synopsis Stress Corrosion Cracking by : V S Raja
Download or read book Stress Corrosion Cracking written by V S Raja and published by Elsevier. This book was released on 2011-09-22 with total page 817 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of stress corrosion cracking (SCC), which causes sudden failure of metals and other materials subjected to stress in corrosive environment(s), has a significant impact on a number of sectors including the oil and gas industries and nuclear power production. Stress corrosion cracking reviews the fundamentals of the phenomenon as well as examining stress corrosion behaviour in specific materials and particular industries. The book is divided into four parts. Part one covers the mechanisms of SCC and hydrogen embrittlement, while the focus of part two is on methods of testing for SCC in metals. Chapters in part three each review the phenomenon with reference to a specific material, with a variety of metals, alloys and composites discussed, including steels, titanium alloys and polymer composites. In part four, the effect of SCC in various industries is examined, with chapters covering subjects such as aerospace engineering, nuclear reactors, utilities and pipelines. With its distinguished editors and international team of contributors, Stress corrosion cracking is an essential reference for engineers and designers working with metals, alloys and polymers, and will be an invaluable tool for any industries in which metallic components are exposed to tension, corrosive environments at ambient and high temperatures. Examines the mechanisms of stress corrosion cracking (SCC) presenting recognising testing methods and materials resistant to SCC Assesses the effect of SCC on particular metals featuring steel, stainless steel, nickel-based alloys, magnesium alloys, copper-based alloys and welds in steels Reviews the monitoring and management of SCC and the affect of SCC in different industries such as petrochemical and aerospace
Book Synopsis Journal of the Mechanical Behavior of Materials by :
Download or read book Journal of the Mechanical Behavior of Materials written by and published by . This book was released on 2003 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Crack Growth Rate Test Results for Al-Li 2195 Parent Metal, Variable Polarity Plasma Arc Welds and Friction Stir Welds by : Robert A. Hafley
Download or read book Fatigue Crack Growth Rate Test Results for Al-Li 2195 Parent Metal, Variable Polarity Plasma Arc Welds and Friction Stir Welds written by Robert A. Hafley and published by . This book was released on 2000 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fatigue crack growth rate of aluminum-lithium (Al-Li) alloy 2195 plate and weldments was determined at 200°F, ambient temperature and -320°F. The effects of stress ratio (R), welding process, orientation and thickness were studied. Results are compared with plate data from the Space Shuttle Super Lightweight Tank (SLWT) allowables program. Data from the current series of tests, both plate and weldment, falls within the range of data generated during the SLWT allowables program.
Book Synopsis Stress Corrosion Cracking Susceptibility of Aluminum-base Alloys 2195 and 2219 by : Abdulbaset Ali Frefer
Download or read book Stress Corrosion Cracking Susceptibility of Aluminum-base Alloys 2195 and 2219 written by Abdulbaset Ali Frefer and published by . This book was released on 1996 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Corrosion Behavior of Friction Stir Welded High Strength Aluminum Alloys by : J. B. Lumsden
Download or read book Corrosion Behavior of Friction Stir Welded High Strength Aluminum Alloys written by J. B. Lumsden and published by . This book was released on 2002 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Friction stir welding (FSW), a relatively new solid state joining process, is used to join aluminum alloys of all compositions including alloys essentially considered unweldable. During FSW, a rotating tool provides a continual hot working action, plasticizing metal within a narrow zone at the join line, while transporting metal from the leading face of the probe to the trailing edge as the tool moves along the interface. Although melting does not occur during FSW, temperatures are sufficiently high and times at temperature sufficiently long to cause dissolution, nucleation, and/or coarsening of strengthening precipitates. The temperature-time profile changes with distance from the nugget causing a gradient in micro structure and precipitate morphology. The altered micro structure in the weld zone becomes sensitized in some high strength aluminum alloys. Results presented assess the pitting, intergranular, and SCC corrosion behavior of FSW 7XXX and 2XXX alloys. Progress in understanding the changes in microstructure responsible for the sensitization will be discussed. The presentation also will include evaluations of approaches for corrective measures.
Book Synopsis Stress-corrosion Cracking in High Strength Steels and in Titanium and Aluminum Alloys by : Benjamin Floyd Brown
Download or read book Stress-corrosion Cracking in High Strength Steels and in Titanium and Aluminum Alloys written by Benjamin Floyd Brown and published by . This book was released on 1972 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Friction Stir Welding of High Strength 7XXX Aluminum Alloys by : Rajiv S. Mishra
Download or read book Friction Stir Welding of High Strength 7XXX Aluminum Alloys written by Rajiv S. Mishra and published by Butterworth-Heinemann. This book was released on 2016-06-08 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Friction Stir Welding of High Strength 7XXX Aluminum Alloys is the latest edition in the Friction Stir series and summarizes the research and application of friction stir welding to high strength 7XXX series alloys, exploring the past and current developments in the field. Friction stir welding has demonstrated significant benefits in terms of its potential to reduce cost and increase manufacturing efficiency of industrial products in transportation, particularly the aerospace sector. The 7XXX series aluminum alloys are the premium aluminum alloys used in aerospace. These alloys are typically not weldable by fusion techniques and considerable effort has been expended to develop friction stir welding parameters. Research in this area has shown significant benefit in terms of joint efficiency and fatigue performance as a result of friction stir welding. The book summarizes those results and includes discussion of the potential future directions for further optimization. Offers comprehensive coverage of friction stir welding of 7XXX series alloys Discusses the physical metallurgy of the alloys Includes physical metallurgy based guidelines for obtaining high joint efficiency Summarizes the research and application of friction stir welding to high strength 7XXX series alloys, exploring the past and current developments in the field
Book Synopsis Fatigue Crack Growth Behavior of Friction Stir Welded 2024-T3 Aluminum Alloy Tested Under Accelerated Salt Fog Exposure by : M. Milan
Download or read book Fatigue Crack Growth Behavior of Friction Stir Welded 2024-T3 Aluminum Alloy Tested Under Accelerated Salt Fog Exposure written by M. Milan and published by . This book was released on 2014 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue crack growth properties of friction stir welded joints of 2024-T3 aluminum alloy were studied via constant amplitude load (increasing ?K) testing under open air and accelerated salt fog exposure conditions. For low ?K values, longitudinal crack growth in the weld line center was slower under corrosion fatigue than by air because of the prevalence of corrosion-induced crack closure. On the other hand, growth rates of transverse crack crossing the weld nugget were not affected by the environment aggressiveness because of a balance between hydrogen embrittlement and corrosion inducing crack closure along with welding compressive residual stresses. For intermediate ?K values, propagation rates 5 times faster were observed for both longitudinal and transverse cracks under salt fog ambient as a result of hydrogen-induced embrittlement, which is favored by larger crack tip openings allowing local corrosive medium access. As the final catastrophic fracture approaches, longitudinal and transversal crack propagation rates under corrosion fatigue approximated the values observed in air testing, as time, under the 30-Hz loading frequency applied, was scarce for an effective interaction between crack tip fresh material and the hostile environment. For longitudinal cracks, precracking in air resulted in fatigue-corrosion limit factor ?Kth slightly lower than that obtained in salt fog precracked specimens, as the corrosive role played by the salt fog environment along the precrack introduction contributed to crack-closure effect, so increasing the apparent value of ?Kth. On the other hand, the environment in which a transverse precrack was created had a negligible effect on ?Kth because of the establishment of an equilibrium condition between corrosion-induced precrack closure and hydrogen embrittlement.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781725049451 Total Pages :32 pages Book Rating :4.0/5 (494 download)
Book Synopsis A Study of Friction Stir Welded 2195 Al-Li Alloy by the Scanning Reference Electrode Technique by : National Aeronautics and Space Administration (NASA)
Download or read book A Study of Friction Stir Welded 2195 Al-Li Alloy by the Scanning Reference Electrode Technique written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-10 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the corrosion of friction stir welded 2195 Al-Li alloy has been carried out using the scanning reference electrode technique (SRET). The results are compared to those obtained from a study of heterogeneously welded samples. Donford, M. D. and Ding, R. J. Marshall Space Flight Center NASA/TP-1998-207399, NAS 1.60:207399, M-858 ...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722132743 Total Pages :32 pages Book Rating :4.1/5 (327 download)
Book Synopsis Corrosion Studies of 2195 Al-Li Alloy and 2219 Al Alloy with Differing Surface Treatments by : National Aeronautics and Space Administration (NASA)
Download or read book Corrosion Studies of 2195 Al-Li Alloy and 2219 Al Alloy with Differing Surface Treatments written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion studies of 2195 Al-Li and 2219 Al alloys have been conducted using the scanning reference electrode technique (SRET) and the polarization resistance (PR) technique. The SRET was used to study corrosion mechanisms, while corrosion rate measurements were studied with the PR technique. Plates of Al203 blasted, soda blasted and conversion coated 2219 Al were coated with Deft primer and the corrosion rates studied with the EIS technique. Results from all of these studies are presented. Danford, M. D. and Mendrek, M. J. Marshall Space Flight Center ...
Book Synopsis Stress-corrosion Cracking of Aluminum Alloys by : J. D. Jackson
Download or read book Stress-corrosion Cracking of Aluminum Alloys written by J. D. Jackson and published by . This book was released on 1965 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microstructure Evolution and Stress Corrosion Cracking Behavior in Short-term Thermomechanically Processed Al-Cu-Li Alloys by : Jannik Entringer
Download or read book Microstructure Evolution and Stress Corrosion Cracking Behavior in Short-term Thermomechanically Processed Al-Cu-Li Alloys written by Jannik Entringer and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increasing access to space leaves human footprints in orbits closer to the Earth. Today, space debris poses a major risk for in-service missions and on-ground casualties. Reducing the amount of debris is the only way to preserve key orbits. One strategy to avoid future debris is to maneuver spacecraft after mission into the atmosphere where the structure burns up. This strategy is taken into account at early design stages of modern spacecraft. Therefore, material choices must be made to ensure high structural demisability. Titanium, currently used in propellant tanks, is often a large portion, by mass, of the total structure and does not completely ablate during re-entry. Aluminum-copper-lithium alloys are being considered as a substitute for titanium in propellant tanks because they deliver comparable specific material properties at a higher demisability rate. Because the technology of aluminum-copper-lithium alloys in space structures is not as mature as that of titanium, new joining methods must be developed. Friction stir welding features the unique characteristic of joining in the solid state; thus, it is especially attractive for hard-to-weld alloys such as aluminum-copper-lithium. The development of space structures requires a fundamental knowledge of the material behavior, both during processing and during the subsequent exposure to the environment. In recent years, aluminum copper-lithium alloys have rarely been welded by bobbin tool friction stir welding. The underlying microstructure evolution has been described as complex, certain aspects are not fully understood and contradictory results have been reported. Current knowledge on the behavior of welded joints on this specific alloy under stress and exposed to corrosive environments is limited. Therefore, for the possible use in spacecraft structures, a scientific analysis of the stress corrosion behavior of welded joints is necessary. As part of the present work, two modern aluminum-copper lithium alloys were successfully joined by semi-stationary bobbin tool friction stir welding. Identical parameters allowed a detailed comparison of the process response. The welding process imposes a short time, thermomechanical exposure in the base material that leads to severe microstructure modification. Based on the chemical composition of the two alloys, the microstructural evolution is explained, and a precipitation sequence is proposed. Overaged strengthening precipitates and equilibrium phases of several types were identified to form during welding. These modifications led to a reduced mechanical performance of 78 % of the ultimate tensile strength. Stress corrosion analyses were performed on pre-, as- and post-welded samples and were correlated with the modified microstructure. Stress corrosion cracking phenomena were found to result from the short-time, thermomechanical effect induced by the welding process. The mechanism leading to stress corrosion lies in the modified microstructure, where coarse, precipitates accumulate at the grain boundaries. These particles are observed to promote local galvanic reactions, which promote dissolution and the consequent development of a cracking network under stress.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microstructure Evaluation on Friction Stir Welding of Cryorolled 2219 Aluminum Alloy by : K. Kamal Babu
Download or read book Microstructure Evaluation on Friction Stir Welding of Cryorolled 2219 Aluminum Alloy written by K. Kamal Babu and published by . This book was released on 2019 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This article presents a study of friction stir welding (FSW) on cryorolled (CR) AA2219 alloy using a hexagonal pin tool with different set of process parameters. Normally, AA2219 alloy is difficult to weld, but it is possible to get a defect-free, sound weldment with a solid-state welding technique (FSW) compared to traditional welding methods. Here, among the 9 weld joints, the weld made on CR AA2219 by the hexagonal pin tool with 1,000r/min tool rotational speed at 25mm/min welding speed and 3 axis inclination exhibited better tensile strength, impact toughness, hardness, and corrosion resistance. It was confirmed by microscopy analysis that the ultrafine grains structure and dissolution of Al2Cu were present at the weld zone. The fine dimple morphology was found at the fracture surface area of weldment. Also, the X-ray Diffraction (XRD) and energy-dispersive X-ray results showed that the intensity of Al2Cu was decreased at the weld portion for the CR AA2219. Dissolution of precipitates resisted the flow of electrons and delivered good resistance against corrosion. Corroded portion surface topography was analyzed, and pit details were measured.
