Download or read book Laser Surface Melting of Aluminium Alloy 6013 for Improving Stress Corrosion and Corrosion Fatigue Resistance written by Wenlong Xu and published by . This book was released on 2007 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface Engineering of Light Alloys written by Hanshan Dong and published by Elsevier. This book was released on 2010-05-24 with total page 681 pages. Available in PDF, EPUB and Kindle. Book excerpt: The growing use of light alloys in industries such as aerospace, sports equipment and biomedical devices is driving research into surface engineering technologies to enhance their properties for the desired end use. Surface engineering of light alloys: Aluminium, magnesium and titanium alloys provides a comprehensive review of the latest technologies for modifying the surfaces of light alloys to improve their corrosion, wear and tribological properties. Part one discusses surface degradation of light alloys with chapters on corrosion behaviour of magnesium alloys and protection techniques, wear properties of aluminium-based alloys and tribological behaviour of titanium alloys. Part two reviews surface engineering technologies for light alloys including anodising, plasma electrolytic oxidation, thermal spraying, cold spraying, physical vapour deposition, plasma assisted surface treatment, PIII/PSII treatments, laser surface modification, ceramic conversion and duplex treatments. Part three covers applications for surface engineered light alloys including sports equipment, biomedical devices and plasma electrolytic oxidation and anodised aluminium alloys for spacecraft applications. With its distinguished editor and international team of contributors, Surface engineering of light alloys: Aluminium, magnesium and titanium alloys is a standard reference for engineers, metallurgists and materials scientists looking for a comprehensive source of information on surface engineering of aluminium, magnesium and titanium alloys. Discusses surface degradation of light alloys considering corrosion behaviour and wear and tribological properties Examines surface engineering technologies and modification featuring plasma electrolytic oxidation treatments and both thermal and cold spraying Reviews applications for engineered light alloys in sports equipment, biomedical devices and spacecraft

Download or read book Laser Surface Modification of Alloys for Corrosion and Erosion Resistance written by C T Kwok and published by Elsevier. This book was released on 2012-03-20 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion and erosion processes often occur synergistically to cause serious damage to metal alloys. Laser surface modification techniques such as laser surface melting or alloying are being increasingly used to treat surfaces to prevent corrosion or repair corroded or damaged components. Laser surface modification of alloys for corrosion and erosion resistance reviews the wealth of recent research on these important techniques and their applications. After an introductory overview, part one reviews the use of laser surface melting and other techniques to improve the corrosion resistance of stainless and other steels as well as nickel-titanium and a range of other alloys. Part two covers the use of laser surface modification to prevent different types of erosion, including liquid impingement, slurry (solid particle) and electrical erosion as well as laser remanufacturing of damaged components. With its distinguished editor and international team of contributors, Laser surface modification of alloys for corrosion and erosion resistance is a standard reference for all those concerned with preventing corrosion and erosion damage in metallic components in sectors as diverse as energy production and electrical engineering. Reviews recent research on the use of laser surface modification techniques, including the prevention of corrosion and repair of corroded or damaged components Discusses the techniques for improving the corrosion resistance of steels, nickel-titanium and a range of alloys Analyses the use of laser surface modification to prevent different types of erosion, including liquid impingement and laser remanufacturing of damaged components

Download or read book Shreir s Corrosion written by and published by Elsevier. This book was released on 2009-02-27 with total page 3652 pages. Available in PDF, EPUB and Kindle. Book excerpt: This four-volume reference work builds upon the success of past editions of Elsevier’s Corrosion title (by Shreir, Jarman, and Burstein), covering the range of innovations and applications that have emerged in the years since its publication. Developed in partnership with experts from the Corrosion and Protection Centre at the University of Manchester, Shreir’s Corrosion meets the research and productivity needs of engineers, consultants, and researchers alike. Incorporates coverage of all aspects of the corrosion phenomenon, from the science behind corrosion of metallic and non-metallic materials in liquids and gases to the management of corrosion in specific industries and applications Features cutting-edge topics such as medical applications, metal matrix composites, and corrosion modeling Covers the benefits and limitations of techniques from scanning probes to electrochemical noise and impedance spectroscopy

Download or read book Corrosion Resistance of Aluminum and Magnesium Alloys written by Edward Ghali and published by John Wiley & Sons. This book was released on 2010-05-05 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt: Valuable information on corrosion fundamentals and applications of aluminum and magnesium Aluminum and magnesium alloys are receiving increased attention due to their light weight, abundance, and resistance to corrosion. In particular, when used in automobile manufacturing, these alloys promise reduced car weights, lower fuel consumption, and resulting environmental benefits. Meeting the need for a single source on this subject, Corrosion Resistance of Aluminum and Magnesium Alloys gives scientists, engineers, and students a one-stop reference for understanding both the corrosion fundamentals and applications relevant to these important light metals. Written by a world leader in the field, the text considers corrosion phenomena for the two metals in a systematic and parallel fashion. The coverage includes: The essentials of corrosion for aqueous, high temperature corrosion, and active-passive behavior of aluminum and magnesium alloys The performance and corrosion forms of aluminum alloys The performance and corrosion forms of magnesium alloys Corrosion prevention methods such as coatings for aluminum and magnesium Electrochemical methods of corrosion investigation and their application to aluminum and magnesium alloys Offering case studies and detailed references, Corrosion Resistance of Aluminum and Magnesium Alloys provides an essential, up-to-date resource for graduate-level study, as well as a working reference for professionals using aluminum, magnesium, and their alloys.

Download or read book Laser Surface Engineering of Aluminum Alloys written by Sandip Harimkar and published by Butterworth-Heinemann. This book was released on 2018-03-01 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser Surface Engineering of Aluminum Alloys presents a comprehensive overview of LSE approaches (laser surface melting, laser alloying, laser cladding, laser composite surfacing, laser shock peening) for all of the Al alloy systems, including the developing 8xxx series alloys. The book discusses in detail the influence of laser processing parameters on the development of microstructure, mechanical/electrochemical properties, residual stresses and defects. Laser surface engineering (LSE) of Al alloys is of considerable scientific and technological interest due to unique processing features such as rapid cooling rate, non-contact heating and superior process control. Aluminum (Al) alloys are the one of the most popular structural materials due to their ductility and high strength-to-weight ratio, and have been extensively used in aircraft, automobile and sports industries. However, these alloys often exhibit insufficient corrosion resistance, stress-corrosion cracking resistance, and wear resistance properties for applications in these industries. Significant efforts are now directed toward modifying the surface characteristics of these alloys for improved surface properties. Provides a comprehensive overview of laser surface processing approaches, including thermal aspects, compositional effects and microstructure development associated with each approach Features separate chapters/sections for all Al alloy systems, including newer emerging systems Provides a valuable reference for further research in the area Covers the techniques used for surface preparation of aluminum alloys for laser processing, including details such as focus parameters, nozzle designs, inert gas and safety relevant to operation of practical laser surface processing set-ups

Download or read book Excimer Laser Surface Melting Treatment on 7075 T6 Aluminium Alloy for Improved Corrosion Resistance written by Bader M. H. M. Elkandari and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High strength 7xxx aluminium alloys are used extensively in the aerospace industry because the alloys offer excellent mechanical properties. Unfortunately, the alloys can suffer localised corrosion due to the presence of large intermetallic particles at the alloy surface that are aligned in the rolling direction. Laser surface melting (LSM) techniques offer the potential to reduce and/or to eliminate the intermetallic phases from the surface of the alloy without affecting the alloy matrix. The present study concerns the application of LSM using an excimer laser to enhance the corrosion resistance of AA 7075-T6 aluminium alloy. The initial stage of the project was aimed at optimising the laser conditions for production of a uniform microstructure, with the increase in the corrosion resistance of the alloy being determined by potentiodynamic polarization measurements in sodium chloride solution. Low and high laser energy densities were used with a different number of pulses per unit area to treat the alloy surface, which were achieved by changing both the laser fluence and the pulse repetition frequency. A laser fluence of 3.3 J/cm2 with 80 pulses was subsequently selected as the optimum condition to treat the surface of the alloy. The composition and microstructure of the alloy before and after LSM treatment, and following corrosion tests, were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD).After the laser treatment, the surface and the cross-sections of the alloy showed a significant reduction in the number of large intermetallic particles and a relatively homogenous melted layer was generated that provided significant improvement in the resistance of the alloy against corrosion, as assessed by several corrosion test methods, including exfoliation corrosion (EXCO) tests. However, delamination of the melted layer was observed after extended testing in the EXCO solution which is possibly related to the formation of bands of fine magnesium and zinc-rich precipitates within the melted layer. Therefore, anodising in sulphuric acid was applied to the LSM alloy, in order to further increase the corrosion resistance and to protect the laser treated layer from delamination by generating a thin oxide film over the LSM layer. The results revealed that the anodic treatment increased the resistance of the alloy to exfoliation attack.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laser Shock Peening Process to Prevent Stress Corrosion Cracking of 5xxx Aluminum Alloys written by Shiding Sun and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Since their introduction in the 1920s, 5xxx series aluminum (Al) alloys have been widely employed for marine applications. The 5083-H116 Al alloy plates, in particular, are still used in the hull construction of many military and commercial vessels. However, the high amount of magnesium (Mg) contained in Al-Mg solids leads to thermodynamic instability. When these Al alloys are exposed to elevated temperatures, the Al3Mg2 phase is precipitated on the grain boundaries, making them susceptible to stress corrosion cracking (SCC). By introducing compressive residual stress on the surface of metallic materials, laser shock peening (LSP) has been demonstrated to improve mechanical properties, wear resistance, and fatigue life; and it is considered to be a very promising method for effectively preventing SCC problems. Currently, most LSP can only be carried out in a lab environment using Nd:Glass or Nd:YAG lasers with high pulse energy (over 1 J). The cumbersome equipment, complicated procedures, terrible efficiency, high cost, and rigorous requirements for the operating environment greatly limit the application and potential use of LSP. This study investigated an LSP processing technology for 5xxx series Al alloys using a low pulse energy Nd:YAG laser. Through systematic experiments and tests, the feasibility and effects of this technology were confirmed. After careful parameter optimization, a high level compressive residual stress (about -250 MPa) was achieved on 5083-H116 Al alloy plates. After LSP, the surface hardness and the yield strength of the Al material were enhanced about 20% and 10%, respectively. Moreover, the in-lab test results indicated that the service life of 5083-H116 Al alloy was extended obviously in an SCC-susceptible environment. These results are significant because a peening effect comparable to conventional high-energy LSP techniques was achieved using a Nd:YAG laser with a much lower pulse energy (0.65 J). Based on these results, a portable industrial LSP system was designed, built, and tested, which is capable of operation in harsh environments for on-site repair of marine vessels with an SCC problem and prevention of SCC in the future.

Download or read book Laser Surface Melting and Application of Silane Coating to Improve the Corrosion Resistance of ZE41 Magnesium Alloy written by Parama Chakraborty Banerjee and published by . This book was released on 2012 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnesium (Mg) alloys are the lightest metallic material with excellent physical and mechanical properties. High strength to weight ratio makes them very attractive to the automobile and aerospace industries, but the use of Mg alloys is restricted due to their poor corrosion resistance. For wider use of Mg and its alloys for structural applications, it is necessary to find a durable solution for their poor corrosion resistance. Corrosion is essentially a surface degradation process, which can be minimized by suitable surface modification and/or coatings. In this study, the influence of laser surface melting and application of silane coating on the corrosion resistance of ZE41 alloy has been investigated. Influence of laser surface melting and laser processing parameters on the resultant microstructure, and as a result, on the corrosion kinetics has been investigated. Although laser surface melting has profound influence on the resultant surface microstructure, contrary to what has been reported for other magnesium alloys, this treatment has been found to have little effect on the corrosion resistance of ZE41. This has been explained on the basis of the results of the scanning electron microscopy (SEM), X-ray mapping, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). SEM investigations of the corroded specimens revealed that the corrosion morphologies of the laser melted and the untreated alloy were significantly different. Development of a uniform silane coating necessitates the presence of a reasonably uniform hydroxide layer on the metal surface. Hence, in the present study, the influence of alkali surface pre-treatment on the corrosion resistance of the silane coated ZE41 has been investigated using potentiodynamic polarization and EIS. This study concludes that alkaline pre-treatment prior to silane coating considerably improves corrosion resistance. A thorough morphological and electrochemical characterization suggests that a particular alkaline pre-treatment, that develops a thick and uniform hydroxide film on the surface, also facilitates formation of a protective silane film on the substrate.Octadecyltrimethoxy silane (ODTMS) has been applied on alkaline pre-treated ZE41 alloy, and, a thorough and systematic electrochemical and analytical investigation of the influence of different coating parameters (such as, silane concentration, pH of hydrolysis and dipping time) on the resultant ODTMS coating, and hence on the corrosion resistance of ZE41 alloy in 0.1 M NaCl has been undertaken. This study suggests that the concentration of ODTMS, pH of hydrolysis and dipping time play crucial roles in the determination of the concentration of the silanols in the coating bath available for bonding with the metal substrate. ZE41 alloy, pre-treated in 3 M sodium hydroxide solution for 48 h, and then immersed for 60 min in the hydroalcoholic solution of 5% ODTMS hydrolysed at pH 7, provided about two and half orders of magnitude improvement in corrosion resistance at 170 h of immersion in 0.1 M sodium chloride solution.

Download or read book Metals Abstracts written by and published by . This book was released on 1996 with total page 1628 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metals Abstracts Index written by and published by . This book was released on 1996 with total page 1622 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laser Material Processing written by William M. Steen and published by Springer Science & Business Media. This book was released on 2013-04-18 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: New chapters on bending and cleaning reflect the changes in the field since the last edition, completing the range of practical knowledge about the processes possible with lasers already familiar to users of this well-known text. Professor Steen's lively presentation is supported by a number of original cartoons by Patrick Wright and Noel Ford, which will bring a smile to your face and ease the learning process. From the reviews: "...well organized, and the text is very practical...The engineering community will find this book informative and useful." (OPTICS AND PHOTONICS NEWS, July/August 2005)

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1984 with total page 1200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1997 with total page 940 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recent Trends in Processing and Degradation of Aluminium Alloys written by Zaki Ahmad and published by IntechOpen. This book was released on 2011-11-21 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the recent decade a quantum leap has been made in production of aluminum alloys and new techniques of casting, forming, welding and surface modification have been evolved to improve the structural integrity of aluminum alloys. This book covers the essential need for the industrial and academic communities for update information. It would also be useful for entrepreneurs technocrats and all those interested in the production and the application of aluminum alloys and strategic structures. It would also help the instructors at senior and graduate level to support their text.

Download or read book Hybrid Laser Arc Welding written by F O Olsen and published by Elsevier. This book was released on 2009-06-26 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hybrid laser-arc welding (HLAW) is a combination of laser welding with arc welding that overcomes many of the shortfalls of both processes. This important book gives a comprehensive account of hybrid laser-arc welding technology and applications. The first part of the book reviews the characteristics of the process, including the properties of joints produced by hybrid laser-arc welding and ways of assessing weld quality. Part two discusses applications of the process to such metals as magnesium alloys, aluminium and steel as well as the use of hybrid laser-arc welding in such sectors as ship building and the automotive industry. With its distinguished editor and international team of contributors, Hybrid laser-arc welding is a valuable source of reference for all those using this important welding technology. Reviews arc and laser welding including both advantages and disadvantages of the hybrid laser-arc approach Explores the characteristics of the process including the properties of joints produced by hybrid laser-arc welding and ways of assessing weld quality Examines applications of the process including magnesium alloys, aluminium and steel with specific focus on applications in the shipbuilding and automotive industries