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Author:
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 1042
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Book Description
Author:
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 1042
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Book Description
Author: Jacques Karel Dreyer
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 0
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Book Description
Lasers are fast becoming a common method for reducing the effects of failure mechanisms in metals. In a surface treatment process known as laser shock peening, lasers are being employedto increase the fatigue strength of materials. In order to reduce the failure from fatigue in steam turbine blades, laser shock peening is used to enhance the properties of the 12% chromium Firth-Vickers 566 martensitic stainless-steel material used for these blades. However, appropriate computational techniques to model laser shock peening in order to retrieve residual stress results using finite element modelling are still largely under investigation. Hence, this original study investigated a numerical modelling technique employing a quasi-static analysis to deliberately introduce approximation into the analysis by ignoring the mass and acceleration terms that are normally present in a conventional dynamic explicit laser shock peening analysis (which has good prediction capability of residual stresses) in order to reduce computational time. To compensate for the modelling approximation, the input pressure loads spatial profile parameters were varied in an attempt to obtain similar residual stress results to those of a dynamic explicit analysis. It is believed that such a study had not previously been conducted. The outcome of the study showed that a quasi-static analysis accelerates the simulation time up to 29 times. In addition, when machine learning with a partial least squares’ algorithm was used on input spatial profile and output residual stress data sets (obtained from performing trial and error in order to match the dynamic explicit results closely), the quasi-static input spatial results were obtained in sub one second, aiding with computational efficiency. Through comparing the non-dynamic and dynamic simulations, it becomes clear that inertial effects are essential in modelling a realistic laser shot peening process. Hence if all the principal stress components other than the surface residual stress profile in one plane are required, the conventional dynamic explicit analysis technique should be employed. In short, the outcome of the explorative study contributes to knowledge by showing that the developed quasi-static modelling technique produced unrealistic results, even though the S11 surface residual stress profile and the experimental profile correlated well with a mean absolute percentage difference of only 3.27% for the first 0.5 mm and a 4.2% difference between the analytical and simulated result. Hence, the developed technique should only be applied by researchers studying the surface residual stress results.
Author: Lauralice de Campos Franceschini Canale
Publisher: ASM International
ISBN: 1615030980
Category : Technology & Engineering
Languages : en
Pages : 651
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Book Description
Author: W. Gissler
Publisher: Springer Science & Business Media
ISBN: 9780792320067
Category : Technology & Engineering
Languages : en
Pages : 416
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Book Description
The hardest requirements on a material are in general imposed at the surface: it has to be wear resistant for tools and bearings; corrosion resistant for turbine blades; antireflecting for solar cells; and it must combine several of these properties in other applications. `Surface engineering' is the general term that incorporates all the techniques by which a surface modification can be accomplished. These techniques include both the more traditional methods, such as nitriding, boriding and carburizing, and the newer ones, such as ion implantation, laser beam melting and, in particular, coating. This book comprises and compares in a unique way all these techniques of surface engineering. It is a compilation of lectures which were held by renowned scientists and engineers in the frame of the well known `EuroCourses' of the Joint Research Centre of the Commission of the European Communities. The book is principally addressed to material and surface scientists, physicists and chemists, engineers and technicians of industries and institutes where surface engineering problems arise.
Author: Joseph R. Davis
Publisher: ASM International
ISBN: 1615030492
Category : Technology & Engineering
Languages : en
Pages : 349
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Book Description
All of the critical technical aspects of gear materials technology are addressed in this new reference work. Gear Materials, Properties, and Manufacture is intended for gear metallurgists and materials specialists, manufacturing engineers, lubrication technologists, and analysts concerned with gear failures who seek a better understanding of gear performance and gear life. This volume complements other gear texts that emphasize the design, geometry, and theory of gears. The coverage begins with an overview of the various types of gears used, important gear terminology, applied stresses and strength requirements associated with gears, and lubrication and wear. This is followed by in-depth treatment of metallic (ferrous and nonferrous alloys) and plastic gear materials. Emphasis is on the properties of carburized steels, the material of choice for high-performance power transmission gearing.
Author: A. Lichtarowicz
Publisher: Springer Science & Business Media
ISBN: 940112678X
Category : Technology & Engineering
Languages : en
Pages : 621
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Book Description
This volume contains papers presented at the 11th International Conference on Jet Cutting Technology, held at St. Andrews, Scotland, on 8-10 September 1992. Jetting techniques have been successfully applied for many years in the field of cleaning and descaling. Today, however, jet cutting is used in operations as diverse as removing cancerous growths from the human body, decommissioning sunsea installations and disabling explosive munitions. The diversity is reflected in the papers presented at the conference. The papers were divided into several main sections: jetting basics -- materials; jetting basics -- fluid mechanics; mining and quarrying; civil engineering; new developments; petrochem; cleaning and surface treatment; and manufacturing. The high quality of papers presented at the conference has further reinforced its position as the premier event in the field. The volume will be of interest to researchers, developers and manufacturers of systems, equipment users and contractors.
Author: Roger C. Reed
Publisher: Cambridge University Press
ISBN: 1139458639
Category : Technology & Engineering
Languages : en
Pages : 363
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Book Description
Superalloys are unique high-temperature materials used in gas turbine engines, which display excellent resistance to mechanical and chemical degradation. This book introduces the metallurgical principles which have guided their development. Suitable for graduate students and researchers, it includes exercises and additional resources at www.cambridge.org/9780521859042.
Author: Michael J Neale
Publisher: Elsevier
ISBN: 0080519660
Category : Technology & Engineering
Languages : en
Pages : 577
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Book Description
The renowned reference work is a practical guide to the selection and design of the components of machines and to their lubrication. It has been completely revised for this second edition by leading experts in the area.
Author: Dunyong Deng
Publisher: Linköping University Electronic Press
ISBN: 9176853837
Category :
Languages : en
Pages : 82
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Book Description
Additive manufacturing (AM), also known as 3D printing, has gained significant interest in aerospace, energy, automotive and medical industries due to its capabilities of manufacturing components that are either prohibitively costly or impossible to manufacture by conventional processes. Among the various additive manufacturing processes for metallic components, electron beam melting (EBM) and selective laser melting (SLM) are two of the most widely used powder bed based processes, and have shown great potential for manufacturing high-end critical components, such as turbine blades and customized medical implants. The futures of the EBM and SLM are doubtlessly promising, but to fully realize their potentials there are still many challenges to overcome. Inconel 718 (IN718) is a nickel-base superalloy and has impressive combination of good mechanical properties and low cost. Though IN718 is being mostly used as a turbine disk material now, the initial introduction of IN718 was to overcome the poor weldability of superalloys in 1960s, since sluggish precipitation of strengthening phases ?’/?’’ enables good resistance to strain-age cracking during welding or post weld heat treatment. Given the similarity between AM and welding processes, IN718 has been widely applied to the metallic AM field to facilitate the understandings of process-microstructure-property relationships. The work presented in this licentiate thesis aims to better understand microstructures and mechanical properties EBM and SLM IN718, which have not been systematically investigated. Microstructures of EBM and SLM IN718 have been characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and correlated with the process conditions. Monotonic mechanical properties (e.g., Vickers microhardness and tensile properties) have also been measured and rationalized with regards to the microstructure evolutions before and after heat treatments. For EBM IN718, the results show the microstructure is not homogeneous but dependant on the location in the components, and the anisotropic mechanical properties are probably attributed to alignment of porosities rather than texture. Post heat treatment can slightly increase the mechanical strength compared to the as-manufactured condition but does not alter the anisotropy. SLM IN718 shows significantly different microstructure and mechanical properties to EBM IN718. The as-manufactured SLM IN718 has very fine dendritic microstructure and Laves phases in the interdendrites, and is “work-hardened” by the residual strains and dislocations present in the material. Mechanical properties are different between horizontally and vertically built samples, and heat treatment can minimize this difference. Results from this licentiate thesis provide the basis for the further research on the cyclic mechanical properties of EBM and SLM IN718, which would be the focus of following phase of the Ph.D. research.
Author: Marc A. Meyers
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 1130
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Book Description
The scientific understanding of high-velocity deformation has advanced substantially during the past decade. On the one hand, the framework for a theory explaining the metallurgical effects of shock waves is beginning to take shape; on the other hand, the technological applications of high strain-rate processes have found their way into industries in countries around the world. Ex plosive cladding, welding, forming, compaction and consolidation, cutting, and hardening, in addition to high energy-rate deformation processes using other energy sources, are some of the topics of contemporary technological importance. Metallurgical effects are of the utmost importance in both the scientific understanding of the phenomena involved, and in the successful development and utilization of the associated applications. The international conference upon which this book is based had as its major objectives the acceleration of progress in the field of high-strain rate deformation and fabrication, including applications, by providing a forum for the exchange of state-of-the art information on the metallurgical effects of high strain-rate deformation and fabrication; and the organization of this informa tion into a timely and coherent body of knowledge focused around significant areas and applications. This volume is a manifestation of these objectives. In addition, the contents of this book were organized to provide for a somewhat logical perspective of the fundamentals, development, and state-of-the-art applications of high strain-rate and shock phenomena.
