Improvement of Fatigue and Corrosion-fatigue Resistance of AZ31B Cast Alloy by Cold Spray Coating and Top Coating PDF Download
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Author: Siavash Borhan Dayani
Publisher:
ISBN:
Category : Aluminum
Languages : en
Pages : 80
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Book Description
Recent advancements in manufacturing of light-weight structures have caused high interest in industries toward magnesium alloys because of its excellent properties such as specific strength, low density, and fatigue strength. Application of magnesium in the vehicle structure saves energy and reduces gas emission which consequently improves the performance of the vehicle. Magnesium alloys have low corrosion resistance and high tendency to corrode in humid and aqueous environments. The results of recent research show that cold spray coating of pure aluminum powder results in significant improvement in magnesium corrosion. However when tested under cyclic loads, the coated samples developed surface cracks and delamination. Which lead to highly localized corrosion damages underneath of the cracks or any discontinuity in the components. The early cracking was attributed to the low fatigue resistance of pure aluminum. The results of two new approaches in enhancing the corrosion fatigue life of coated magnesium are presented in this thesis. First, an aluminium alloy coating powder with the higher fatigue strength was selected for coating. Al-7075 powder, with average particle size of twenty microns have successfully been coated on AZ31B samples with highly densed, low porosity coated layer. The coating was performed using nitrogen gas at 400oC temperature, and gas pressure of 200 psi. Electrostatic painting was then applied. Result of tests in the corrosive atmosphere of 3.5 % of NaCl solution as well as rotating fatigue test in corrosive environment will be presented. Improvement of fatigue resistance of cold spray coated samples and corrosion-fatigue resistance of cold spray coated, e-painted samples are studied in this thesis.
Author: Siavash Borhan Dayani
Publisher:
ISBN:
Category : Aluminum
Languages : en
Pages : 80
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Book Description
Recent advancements in manufacturing of light-weight structures have caused high interest in industries toward magnesium alloys because of its excellent properties such as specific strength, low density, and fatigue strength. Application of magnesium in the vehicle structure saves energy and reduces gas emission which consequently improves the performance of the vehicle. Magnesium alloys have low corrosion resistance and high tendency to corrode in humid and aqueous environments. The results of recent research show that cold spray coating of pure aluminum powder results in significant improvement in magnesium corrosion. However when tested under cyclic loads, the coated samples developed surface cracks and delamination. Which lead to highly localized corrosion damages underneath of the cracks or any discontinuity in the components. The early cracking was attributed to the low fatigue resistance of pure aluminum. The results of two new approaches in enhancing the corrosion fatigue life of coated magnesium are presented in this thesis. First, an aluminium alloy coating powder with the higher fatigue strength was selected for coating. Al-7075 powder, with average particle size of twenty microns have successfully been coated on AZ31B samples with highly densed, low porosity coated layer. The coating was performed using nitrogen gas at 400oC temperature, and gas pressure of 200 psi. Electrostatic painting was then applied. Result of tests in the corrosive atmosphere of 3.5 % of NaCl solution as well as rotating fatigue test in corrosive environment will be presented. Improvement of fatigue resistance of cold spray coated samples and corrosion-fatigue resistance of cold spray coated, e-painted samples are studied in this thesis.
Author: Mohammad Waheeb Diab
Publisher:
ISBN:
Category : Aluminum
Languages : en
Pages : 113
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Book Description
Magnesium alloys are of a recent interest for the transportation industry due to their excellent properties such as high strength and low density which will save energy and reduce gas emission and it will also improve the vehicle performance. However due to their high chemical activity, magnesium and magnesium alloys have unsatisfactory corrosion resistance and high tendency to corrode in humid and aqueous environments. Although alloying elements provides some improvement in magnesium against corrosion, further protection for these alloys is needed against the corrosion in different corrosive environments. Aluminum powder cold spray is a new coating technology with very promising results in corrosion protection of magnesium alloys. The effect of applying pure aluminum cold spray coating on wrought AZ31B Mg alloy from the corrosion and corrosion fatigue point of view is studied. This research comprises two parts. The first part is studying the corrosion behavior of AZ31B cold spray coated and uncoated coupons by performing an accelerated corrosion testing in a corrosion chamber. The results for both types of coupons have been compared to each other. The second part of this research is to study the fatigue strength by rotating bending machine of stress relieved and stress relieved/coated specimens in salt water environment. S-N curves for the two groups of specimens were plotted. After the analysis and comparison of all the testing results, it was revealed that pure Al cold spray coating considerably improved the corrosion resistance of Mg alloy AZ31B in 5% NaCl fog environment. The microstructural analysis revealed the presence of some secondary phases which act as a cathode and accelerate the corrosion of the anode, Mg alloy. Comparison of corrosion-fatigue S-N curves of stress relieved and stress relieved/coated specimens show fatigue life reduction after cold spray coating to a maximum percentage of 87.6%. The reason for that is the fact that the pure Al powder has much lower ultimate tensile strength than Mg alloy AZ31B. This fact will lead to an earlier crack on the Al coating surface during the fatigue cycles, from which the electrolyte will penetrate to the Mg substrate and cause a localize corrosion and failure.
Author: Hang Z. Yu
Publisher: John Wiley & Sons
ISBN: 3527839348
Category : Technology & Engineering
Languages : en
Pages : 421
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Book Description
Solid-State Metal Additive Manufacturing Timely summary of state-of-the-art solid-state metal 3D printing technologies, focusing on fundamental processing science and industrial applications Solid-State Metal Additive Manufacturing: Physics, Processes, Mechanical Properties, and Applications provides detailed and in-depth discussion on different solid-state metal additive manufacturing processes and applications, presenting associated methods, mechanisms and models, and unique benefits, as well as a detailed comparison to traditional fusion-based metal additive manufacturing. The text begins with a high-level overview of solid-state metal additive manufacturing with an emphasis on its position within the metal additive manufacturing spectrum and its potential for meeting specific demands in the aerospace, automotive, and defense industries. Next, each of the four categories of solid-state additive technologies—cold spray additive manufacturing, additive friction stir deposition, ultrasonic additive manufacturing, and sintering-based processes—is discussed in depth, reviewing advances in processing science, metallurgical science, and innovative applications. Finally, the future directions of these solid-state processes, especially the material innovation and artificial intelligence aspects, are discussed. Sample topics covered in Solid-State Metal Additive Manufacturing include: Physical processes and bonding mechanisms in impact-induced bonding and microstructures and microstructural evolution in cold sprayed materials Process fundamentals, dynamic microstructure evolution, and potential industrial applications of additive friction stir deposition Microstructural and mechanical characterization and industrial applications of ultrasonic additive manufacturing Principles of solid-state sintering, binder jetting-based metal printing, and sintering-based metal additive manufacturing methods for magnetic materials Critical issues inherent to melting and solidification, such as porosity, high residual stress, cast microstructure, anisotropic mechanical properties, and hot cracking Solid-State Metal Additive Manufacturing is an essential reference on the subject for academic researchers in materials science, mechanical, and biomedicine, as well as professional engineers in various manufacturing industries, especially those involved in building new additive technologies.
Author:
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 323
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Book Description
Author: D. N. Williams
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 22
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Book Description
The effects of environment on fatigue behavior are quite intimately related to such test variables as stress intensity, cyclic frequency, and temperature. The effect of these variables has been shown to be quite complex. However, a consistent pattern of behavior is beginning to emerge which, it is hoped, will lead to a considerably changed understanding of the corrosion-fatigue process. It is considered probable that an increased understanding of the corrosion-fatigue process will also contribute measureably to an improved understanding of general fatigue processes. Material variables such as composition, directionality of properties, and microstructure, have important effects on corrosion-fatigue behavior of aluminum alloys. However, it appears that these variables, at least in gaseous environments, may be important largely because of their effects on the mechanical behavior of aluminum alloys. On the other hand, studies in seawater suggest that these variables become increasingly important as the corrosive nature of the environment increases. This memorandum discusses in detail the effects of both test variables and material variables on corrosion fatigue. In addition, current theories of corrosion-fatigue mechanisms are outlined, and several methods of preventing corrosion fatigue are suggested. (Author).
Author: V. I. Birss
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 5
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Book Description
Author: Anatolii Papyrin
Publisher: Elsevier
ISBN: 008046548X
Category : Science
Languages : en
Pages : 341
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Book Description
The topic of this book is Cold Spray technology. Cold Spray is a process of applying coatings by exposing a metallic or dielectric substrate to a high velocity (300 to 1200 m/s) jet of small (1 to 50 μm) particles accelerated by a supersonic jet of compressed gas. This process is based on the selection of the combination of particle temperature, velocity, and size that allows spraying at the lowest temperature possible. In the Cold Spray process, powder particles are accelerated by the supersonic gas jet at a temperature that is always lower than the melting point of the material, resulting in coating formation from particles in the solid state. As a consequence, the deleterious effects of high-temperature oxidation, evaporation, melting, crystallization, residual stresses, gas release, and other common problems for traditional thermal spray methods are minimized or eliminated. This book is the first of its kind on the Cold Spray process. Cold Spray Technology covers a wide spectrum of various aspects of the Cold Spray technology, including gas-dynamics, physics of interaction of high-speed solid particles with a substrate as well as equipment, technologies, and applications. Cold Spray Technology includes the results of more than 20 years of original studies (1984-2005) conducted at the Institute of Theoretical and Applied Mechanics of the Siberian Division of the Russian Academy of Science, as well as the results of studies conducted at most of the research centres around the world. The authors' goal is threefold. The first goal is to explain basic principles and advantages of the Cold Spray process. The second goal is, to give practical information on technologies and equipment. The third goal is to present the current state of research and development in this field over the world. The book provides coverage and data that will be of interest for users of Cold Spray technology as well as for other coating experts. At the present time the Cold Spray method is recognized by world leading scientists and specialists. A wide spectrum of research is being conducted at many research centres and companies in many countries. New approach to spray coatings Results are exceptionally pure coatings Low spray temperature without degradation of powder and substrate materials High productivity, high deposition efficiency High operational safety because of absence of high temperature gas jets, radiation and explosive gases Excellent thermal and electrical conductivity Wide spectrum of applications because of important advantages of the process
Author: ASTM Committee E-9 Staff
Publisher: ASTM International
ISBN: 9780803100305
Category : Alloys
Languages : en
Pages : 298
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Book Description
Author: Pasquale Cavaliere
Publisher: Springer
ISBN: 3319671839
Category : Technology & Engineering
Languages : en
Pages : 566
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Book Description
This book combines the contributions of experts in the field to describe the behavior of various materials, micromechanisms involved during processing, and the optimization of cold-spray technology. It spans production, characterization, and applications including wear resistance, fatigue, life improvement, thermal barriers, crack repair, and biological applications. Cold spray is an innovative coating technology based on the kinetic energy gained by particles sprayed at very high pressures. While the technique was developed in the 1990s, industrial and scientific interest in this technology has grown vastly in the last ten years. Recently, many interesting applications have been associated with cold-sprayed coatings, including wear resistance, fatigue life improvement, thermal barriers, biological applications, and crack repair. However, many fundamental aspects require clarification and description.
Author: R. P. Wei
Publisher:
ISBN:
Category :
Languages : en
Pages : 70
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Book Description
High strength aluminum alloys are employed extensively in the primary structure of current and projected Air Force and civilian aircraft. The service lives and reliability of these aircrafts depend to a great extent on the corrosion fatigue resistance of the structure alloys. Significant efforts are underway to develop powder metallurgy (P/M) alloys that would provide improved corrosion fatigue resistance along with improvements in other mechanical properties. The objective of this study is to understand the chemical and metallurgical aspects of environmental assisted fatigue crack growth (or corrosion fatigue) that can serve (1) as a basis for guiding the development of new and improved alloys, and (2) as a basis for developing rational design procedures for service life predictions. A coordinated fracture mechanics, surface chemistry and materials science approach is used. The research is being performed by Lehigh University with technical support by McDonnell Douglas Research Laboratories. (Author).
