Download or read book Effects of Powder Reuse on the Mechanical Properties of Electron Beam Additively Manufactured Ti 6Al 4V written by Reid Schur and published by . This book was released on 2019 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Heat Treatment on the Microstructure and Mechanical Properties of Electron Beam Additively Manufactured Ti6Al4V with Powder Reuse written by Taehoon Kim and published by . This book was released on 2020 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal additive manufacturing has many advantages such as low material waste, unlimited design complexity, and its cost-effectiveness as a near-net-shape process. It has been applied to many materials, but especially for the fabrication of Ti6Al4V components due to its excellent corrosion resistance, high strength to weight ratio, and biocompatibility. Among a variety of additive manufacturing (AM) techniques, especially powder bed fusion systems, electron beam melting (EBM) has been extensively investigated because of its lower thermal stress in parts compared to Selective Laser Melting (SLM), and high density of parts produced. However, there are limited investigations related to heat treatment as a post-processing technique with powder reuse in EBM AM of Ti6Al4V over consecutive builds for the comparison of microstructure and mechanical properties. Therefore, this research analyzed the effects of heat treatment with powder reuse over 30 build cycles to identify the changes in microstructures and mechanical properties of Grade 5 Ti6Al4V. EBM printed samples were analyzed by tensile testing and scanning electron microscopy. Heat treatment was conducted with sub (710°C) near (950°C) and super (1050°C) beta-transus temperature. As a result of these heat treatments, the alpha lath thickness increased, which caused a reduction in strength and an increase in ductility. Metal subjected to the near beta-transus temperature heat treatment (950°C/1hr) exhibited the best ductility among other heat treatments. The sub beta-transus temperature did not show any difference when compared to the as-built samples, whereas the super beta-transus heat treatment caused a decrease in both the strength and ductility. Through microstructural analysis, sub beta-transus heat treatment showed the same microstructure as as-built samples (prior beta columnar grains with alpha lath). The near beta-transus heat treatment caused coarsening of the alpha lath, whereas the super beta-transus heat treatment caused recrystallization to uniform equiaxed structure with alpha grain boundaries. The super beta-transus heat treatment and corresponding equiaxed grain microstructure caused a change in fracture mode from transcrystalline to intercrystalline. In addition to the use of the near beta-transus heat treatment, the controlling cooling rate is an important factor in obtaining the optimum tensile properties. Regarding powder reuse, there was an increase in the oxygen content, which contributed to the alpha lath thickness and the tensile properties. Lastly, heat treatment and post-build machining the samples appeared to improve the reliability of the Ti6Al4V produced by EBM AM.

Download or read book Powder Reuse in Electron Beam Melting Additive Manufacturing of Ti6Al4V written by Alexander Montelione and published by . This book was released on 2020 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal Additive Manufacturing (AM) is being adopted in the aerospace and orthopedic industries. While the cost of powder feedstock has raised interest in reusing unmelted powder in subsequent builds, powder reuse could degrade part properties. In this study the properties of Ti6Al4V metal powder are evaluated over 30 build cycles in Electron Beam Melting (EBM) AM. The morphological, microstructural, mechanical, and chemical changes are evaluated in cross-sectioned powder particles and compared to control samples. Results show that in response to the elevated build chamber temperature, the powder undergoes a sub-beta-transus aging heat treatment with reuse. Nanoindentation shows that the particles undergo an increase in near-surface hardness (up to 2 GPa) with respect to the core. Tint etching revealed an oxidized surface layers consistent with alpha case formation. The particle hardening appears to result from oxygen diffusion during powder recovery and not work hardening via mechanical aspects of powder recovery.

Download or read book Metallic Powders for Additive Manufacturing written by Enrique J. Lavernia and published by John Wiley & Sons. This book was released on 2024-02-02 with total page 613 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metallic Powders for Additive Manufacturing Overview of successful pathways for producing metal powders for additive manufacturing of high-performance metallic parts and components with tailored properties Metallic Powders for Additive Manufacturing introduces the readers to the science and technology of atomized metal powders beyond empirical knowledge and the fundamental relationships among the chemistry, microstructure, and morphology of atomized metallic powders and their behavior during additive manufacturing. The text sets a foundation of the underlying science that controls the formation and microstructure of atomized metallic droplets, including the relations among the properties of metallic powders, their performance during the manufacturing processes, and the resulting products. Other topics covered include the influence of powder on defect formation, residual stress, mechanical behavior, and physical properties. The concluding two chapters encompass considerations of broader societal implications and overarching themes, including the exploration of alternative feedstock materials, economic analysis, and sustainability assessment. These chapters offer valuable perspectives on the prospective trajectory of the field. Written by a team of experienced and highly qualified professors and academics, Metallic Powders for Additive Manufacturing includes information on: Atomization techniques such as Vacuum Induction Gas Atomization (VIGA), Electrode Induction Melting Gas Atomization (EIMGA), and Plasma Rotating Electrode Process (PREP) Atomization science and technology, covering control of atomization parameters, powder size distribution, effect of processing variables, and theoretical models of atomization Heat transfer and solidification of droplets, covering nucleation, microstructure development, and important thermal and solidification conditions during atomization Atomization of Al, Fe, Ni, Co, Ti, and high entropy alloys, as well as composite powders for additive manufacturing, and guidelines for atomization equipment and powder handling Fundamental processing principles in a variety of metal additive manufacturing processes Powder characteristics and requirements for different additive manufacturing processes Effect of powder chemistry and physical characteristics on additive manufacturing processes, and the microstructure and properties of the built parts Evaluation of alternative feedstock sources for metal additive manufacturing, beyond gas atomized powder Economic and sustainability perspectives on powder production and additive manufacturing Metallic Powders for Additive Manufacturing is an excellent combination of rigorous fundamentals and a practice-oriented and forward-looking resource on the subject for materials scientists and practicing engineers seeking to understand, optimize, and further develop the field of powder production and additive manufacturing.

Download or read book Metal Powder Based Additive Manufacturing written by Kun Zhou and published by John Wiley & Sons. This book was released on 2023-05-08 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal Powder—Based Additive Manufacturing Highly comprehensive resource covering all key aspects of the current developments of metal powder—based additive manufacturing Metal Powder—Based Additive Manufacturing provides valuable knowledge and critical insights regarding the recent advances in various metal powder—based additive manufacturing techniques. This book also reviews typical powder preparation processes and highlights the significance of metal powder—based additive manufacturing for various industrial applications. The key features covered in this book: A rigorous overview of the underlying theories and practical applications of metal powder—based additive manufacturing techniques, including laser powder bed fusion, electron beam melting, laser-based directed energy deposition, and metal binder jetting. An expansive introduction of each technique and its significance pertaining to the printing processes, metallurgical defects, powder materials, equipment, and the microstructures and mechanical properties of the printed parts. A deep exploration of the preparation processes of metal powders for additive manufacturing and the effects of different processes on the powder properties. Comprehensive case studies of parts printed by metal powder—based additive manufacturing for various industrial applications. By providing extensive coverage of relevant concepts in the field of metal powder—based additive manufacturing, this book highlights its essential role in Industry 4.0 and serves as a valuable resource for scientists, engineers, and students in materials science, powder metallurgy, physics, and chemistry. The rich research experience of the authors in additive manufacturing ensures that the readers are provided with both an in-depth understanding and informative technical guidance of metal powder—based additive manufacturing.

Download or read book Origins of Variability in Electron Beam Powder Bed Fusion of Ti6Al4V written by Sean S. Ghods and published by . This book was released on 2021 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additive Manufacturing (AM) processes for metals are advancing at a rapid pace. Among manyattractive qualities, AM relaxes design constraints, enables customization and can significantly reduce material waste in comparison to subtractive manufacturing processes. However, there are some fundamental issues that must be addressed for metal AM to become prevalent in aerospace. Most critical is the reliability of the mechanical properties of the metal and an identification of contributions (i.e., the root causes) to the mechanical variability. In powder bed fusion (PBF) AM, powder reuse from previous build cycles is desired to improve process economics. However, there is limited understanding of the contributions from feedstock reuse to particle-powder-properties and part quality. The first half of this dissertation investigates this topic in electron beam melting (EBM) powder fusion AM of a titanium alloy(Ti6Al4V) over 30 cycles of build and powder reuse. Results show that nearly all aspects of the process are influenced by powder reuse. Specifically, the particle size distribution tightens with reuse, but particle damage increases, which includes surface deformation (reduction in sphericity), partial melting and/or particle fusion and fracture. While no changes in the concentration of Al, V, Fe, H and N occur, there is a significant increase in Oxygen with reuse, which exceeded the concentration limit (0.20%) in just 11 build cycles. Results showed that the strength of the metal increased with powder reuse, whereas the ductility decreased significantly, both relevant to the damage tolerance of the metal. Powder reuse covers inter-build variability but not address the intra-build variability. Establishing an understanding of the mechanical response variation within a build is also necessary for quality control in metal AM. A design of experiments approach was adopted to determine the relative effects of part location, geometry, and proximity on quasi-static and cyclic properties of the metal. Significant effects were found from the radial distance from the center of the build plate and from the thickness of the parts to the ductility and fatigue life. The highest ductility and fatigue life can be obtained from part placement near the center of the build plate and with increasing thickness. This knowledge makes a fundamental contribution and supports successful application of EBM additive manufacturing for stress-critical components in aerospace and beyond. Nevertheless, more expansive efforts are necessary to further mature the technology, such that it can be integrated into aerospace manufacturing as a reliable production process.

Download or read book Failure Analysis of Biometals written by Reza H Oskouei and published by MDPI. This book was released on 2020-12-10 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metallic biomaterials (biometals) are widely used for the manufacture of medical implants, ranging from load-bearing orthopaedic prostheses to dental and cardiovascular implants, because of their favourable combination of properties, including high strength, fracture toughness, biocompatibility, and wear and corrosion resistance. Owing to the significant consequences of implant material failure/degradation, in terms of both personal and financial burden, failure analysis of biometals has always been of paramount importance in order to understand the failure mechanisms and implement suitable solutions with the aim to improve the longevity of implants in the body. Failure Analysis of Biometals presents some of the latest developments and findings in this area. This includes a great range of common metallic biomaterials (Ti alloys, CoCrMo alloys, Mg alloys, and NiTi alloys) and their associated failure mechanisms (corrosion, fatigue, fracture, and fretting wear) that commonly occur in medical implants and surgical instruments.

Download or read book Advances in Metal Additive Manufacturing written by Sachin Salunkhe and published by Elsevier. This book was released on 2022-10-10 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Metal Additive Manufacturing explains fundamental information and the latest research on new technologies, including powder bed fusion, direct energy deposition using high energy beams, and hybrid additive and subtractive methods. This book introduces readers to the technology, provides everything needed to understand how the different stages work together, and inspires to think beyond traditional metal processing to capture new ideas in metal. Chapters offer an introduction on metal additive manufacturing, processes, and properties and standards and then present surveys on the most significant international advances in metal additive manufacturing. Throughout, the book presents a focus on the effect of important process parameters on the microstructure, mechanical properties and wear behavior of additively manufactured parts. Covers the entire process chain of metal additive manufacturing, from input data preparation to part certification Describes a wide range of the latest design tools and options, including generative design, topology optimization, and lattice and surface optimization Addresses additive manufacturing, with a comprehensive list of metals including titanium, aluminum, iron-and nickel-based alloys and Inconel 718

Download or read book Additive Manufacturing of Metal Alloys 2 written by Patrice Peyre and published by John Wiley & Sons. This book was released on 2023-08-29 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metal Additive Manufacturing written by Dyuti Sarker and published by John Wiley & Sons. This book was released on 2021-10-26 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: METAL ADDITIVE MANUFACTURING A comprehensive review of additive manufacturing processes for metallic structures Additive Manufacturing (AM)—also commonly referred to as 3D printing—builds three-dimensional objects by adding materials layer by layer. Recent years have seen unprecedented investment in additive manufacturing research and development by governments and corporations worldwide. This technology has the potential to replace many conventional manufacturing processes, enable the development of new industry practices, and transform the entire manufacturing enterprise. Metal Additive Manufacturing provides an up-to-date review of all essential physics of metal additive manufacturing techniques with emphasis on both laser-based and non-laser-based additive manufacturing processes. This comprehensive volume covers fundamental processes and equipment, governing physics and modelling, design and topology optimization, and more. The text adresses introductory, intermediate, and advanced topics ranging from basic additive manufacturing process classification to practical and material design aspects of additive manufacturability. Written by a panel of expert authors in the field, this authoritative resource: Provides a thorough analysis of AM processes and their theoretical foundations Explains the classification, advantages, and applications of AM processes Describes the equipment required for different AM processes for metallic structures, including laser technologies, positioning devices, feeder and spreader mechanisms, and CAD software Discusses the opportunities, challenges, and current and emerging trends within the field Covers practical considerations, including design for AM, safety, quality assurance, automation, and real-time control of AM processes Includes illustrative cases studies and numerous figures and tables Featuring material drawn from the lead author’s research and professional experience on laser additive manufacturing, Metal Additive Manufacturing is an important source for manufacturing professionals, research and development engineers in the additive industry, and students and researchers involved in mechanical, mechatronics, automatic control, and materials engineering and science.

Download or read book Progress in Metal Additive Manufacturing and Metallurgy written by Robert Pederson and published by MDPI. This book was released on 2020-12-03 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advent of additive manufacturing (AM) processes applied to the fabrication of structural components creates the need for design methodologies supporting structural optimization approaches that take into account the specific characteristics of the process. While AM processes enable unprecedented geometrical design freedom, which can result in significant reductions of component weight, on the other hand they have implications in the fatigue and fracture strength due to residual stresses and microstructural features. This is linked to stress concentration effects and anisotropy that still warrant further research. This Special Issue of Applied Sciences brings together papers investigating the features of AM processes relevant to the mechanical behavior of AM structural components, particularly, but not exclusively, from the viewpoints of fatigue and fracture behavior. Although the focus of the issue is on AM problems related to fatigue and fracture, articles dealing with other manufacturing processes with related problems are also be included.

Download or read book Electron Beam Melting of Metastable Austenitic Stainless Steel written by Johannes Günther and published by BoD – Books on Demand. This book was released on 2020-01-01 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary focus of this work is the processing – microstructure – property correlation of EBM manufactured high-alloyed austenitic CrMnNi stainless steel. Independent of the applied process parameters, to this point this alloy exhibits a fine-grained and weak textured microstructure in the as-built state upon EBM processing. As detailed in the literature review, this is opposite to numerous alloys like the benchmark AISI 316L stainless steel, which are commonly characterized by epitaxial growth of columnar grains elongated parallel to building direction. A theory for this unusual observation is presented based on a grain refinement due the process-inherent cyclic heat-treatment, i.e. repetitive reheating and partial melting of the consolidated material due to the energy input during melting of subsequent layers and resulting solid-liquid as well as solid-solid (ferritic bcc to austenitic fcc phase and vice versa) phase transformations. A calculation of the phase diagram, differential thermal II Abstract analysis and the investigation of the uppermost layers of bulky and thin-walled EBM processed structures are conducted to support this assumption. Moreover, the CrMnNi stainless steel specimens are characterized by an outstanding damage tolerance, which is demonstrated by tensile testing and examination of the fracture surfaces revealing large lack-of-fusion defects due to unsuitable process parameters. Combined EBSD and X-ray diffraction analysis attribute the high damage tolerance to a pronounced strain hardening and mitigation of the effect of defects due to the transformation-induced plasticity (TRIP) effect. The deformation-induced martensitic transformation and associated strain hardening has also been correlated to a considerable low-cycle fatigue performance even under the presence of large inhomogeneities. The chemical composition of the alloy upon EBM processing is strongly dependent on the process parameters, i.e. it is demonstrated that the evaporation rate of Mn varies with the scan strategy and volumetric energy density. This phenomenon is utilized for the fabrication of homogeneous specimens with different Mn concentrations and resulting mechanical properties.These findings are subsequently employed for a prove-of-concept of the possibility to produce functionally graded material by a spatial adjustment of the scan strategy throughout the layer-wise built-up of objects. This is a novel approach for the synthetization of functionally graded materials based on the processing of one homogenous precursor powder feedstock. In summary, the particular CrMnNi stainless steel is introduced as a novel alloy design for AM because it addresses current material-related issues inherent in layer-wise technologies and potentially further contributes to the exploitation of the full potential of AM.

Download or read book Additive Manufacturing Technology written by Kun Zhou and published by John Wiley & Sons. This book was released on 2023-02-28 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Highly comprehensive resource covering all key aspects of the current developments of additive manufacturing Additive Manufacturing Technology: Design, Optimization, and Modeling provides comprehensive and in-depth knowledge of the latest advances in various additive manufacturing technologies for polymeric materials, metals, multi-materials, functionally graded materials, and cell-laden bio-inks. It also details the application of numerical modeling in facilitating the design and optimization of materials, processes, and printed parts in additive manufacturing. The topics covered in this book include: Fundamentals and applications of 4D printing, 3D bioprinting of cell-laden bio-inks, and multi-material additive manufacturing Alloy design for metal additive manufacturing, mechanisms of metallurgical defect formation, and the mechanical properties of printed alloys Modified inherent strain method for the rapid prediction of residual stress and distortion within parts fabricated by additive manufacturing Modeling of the different stages in polymer and metal additive manufacturing processes, including powder spreading, melting, and thermal stress evolution By providing extensive coverage of highly relevant concepts and important topics in the field of additive manufacturing, this book highlights its essential role in Industry 4.0 and serves as a valuable resource for scientists, engineers, and students in materials science, engineering, and biomedicine.

Download or read book On the Impact of Non Optimal Parameters in Additive Manufacturing written by Julia Richter and published by BoD – Books on Demand. This book was released on 2024-01-01 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Die additive Fertigung mit ihrem schichtweisen Aufbau bietet eine Vielzahl attraktiver Eigenschaften wie eine noch nie dagewesene Gestaltungsfreiheit und maßgeschneiderte mechanische Eigenschaften. Unter anderem erlaubt das pulverbettbasierte Laserstrahlschmelzen von Metallen (PBF-LB/M) die Herstellung hochkomplexer Teile mit einem Minimum an Nachbearbeitungsaufwand. Da die additiven Fertigungsverfahren jedoch vergleichsweise neu sind, gibt es noch einige offene Fragen bezüglich der Prozess-Mikrostruktur-Eigenschafts-Beziehung zu klären. In der vorliegenden Arbeit wurde der Einfluss verschiedener Prozessabweichungen, die einen nicht-idealen Prozesszustand darstellen, auf die Mikrostruktur und die mechanischen Eigenschaften von Eisen- und Aluminiumbasislegierungen untersucht. Aufgrund der großen Anzahl unterschiedlicher Prozessabweichungen konzentrierte sich diese Arbeit auf drei exemplarische, nicht-ideale Prozesse, d.h. Prozessunterbrechungen, die Verwendung von nicht-sphärischen Pulvern und einen variierenden Prozessgasstrom. Durch den Einsatz hochauflösender elektronenmikroskopischer Analysemethoden sowie der Röntgentomographie konnten tiefe Einblicke in die Mikrostruktur und die Defektbildungsmechanismen gewonnen werden. Der Einfluss von Mikrostruktur und Defekten auf die Schädigungsentwicklung unter mechanischer Belastung wurde analysiert und eine Modellidee für eine robuste Produktion abgeleitet und mit bestehenden Konzepten diskutiert.

Download or read book Additive Manufacturing written by Juan Pou and published by Elsevier. This book was released on 2021-05-21 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additive Manufacturing explains the background theory, working principles, technical specifications, and latest developments in a wide range of additive manufacturing techniques. Topics addressed include treatments of manufactured parts, surface characterization, and the effects of surface treatments on mechanical behavior. Many different perspectives are covered, including design aspects, technologies, materials and sustainability. Experts in both academia and industry contribute to this comprehensive guide, combining theoretical developments with practical improvements from R&D. This unique guide allows readers to compare the characteristics of different processes, understand how they work, and provide parameters for their effective implementation. This book is part of a four-volume set entitled Handbooks in Advanced Manufacturing. Other titles in the set include Advanced Machining and Finishing, Advanced Welding and Deformation, and Sustainable Manufacturing Processes. Provides theory, operational parameters, and latest developments in 20 different additive manufacturing processes Includes contributions from experts in industry and academia with a wide range of disciplinary backgrounds, providing a comprehensive survey of this diverse and influential subject Includes case studies of innovative additive manufacturing practices from industry

Download or read book Surface Engineered Surgical Tools and Medical Devices written by Mark J. Jackson and published by Springer Science & Business Media. This book was released on 2007-08-03 with total page 595 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the interaction between nano tools and nano materials. It explains the use of appropriate tools in surgery for a variety of applications and provides a complete description of clinical procedures accompanied by photographs. Coverage also presents the latest developments in surface coatings technology such as chemical vapor deposition for use on complex cutting tools for biomedical applications.

Download or read book Additive Manufacturing of Metals The Technology Materials Design and Production written by Li Yang and published by Springer. This book was released on 2017-05-11 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a unique guide to the three-dimensional (3D) printing of metals. It covers various aspects of additive, subtractive, and joining processes used to form three-dimensional parts with applications ranging from prototyping to production. Examining a variety of manufacturing technologies and their ability to produce both prototypes and functional production-quality parts, the individual chapters address metal components and discuss some of the important research challenges associated with the use of these technologies. As well as exploring the latest technologies currently under development, the book features unique sections on electron beam melting technology, material lifting, and the importance this science has in the engineering context. Presenting unique real-life case studies from industry, this book is also the first to offer the perspective of engineers who work in the field of aerospace and transportation systems, and who design components and manufacturing networks. Written by the leading experts in this field at universities and in industry, it provides a comprehensive textbook for students and an invaluable guide for practitioners