Download or read book Residual Stress in Plasma Transferred Arc PTA of Ti 6Al 4V for Additive Manufacturing AM written by Hadi Moztarzadeh and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantitative Determination of Residual Stress on Additively Manufactured Ti 6Al 4V written by Mercedes M. Ferraro and published by . This book was released on 2018 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additive manufacturing (AM) is a method to build a three-dimensional part through the layering of material. One category of AM, Direct Energy Deposition (DED), is commonly used with the titanium alloy, Ti-6Al-4V, and has shown to be useful for aerospace, transportation, and biomedical applications. However, the DED process induces anisotropic material properties due to the nonuniform temperature distribution, which causes residual stresses. In addition, when handling titanium and its alloys, the processing history and post-heat treatment greatly influence the microstructure, residual stresses, and mechanical properties. Previous research has been done to investigate the residual stresses by methods such as X-ray diffraction, contour methods, and finite element simulations. However, a less established technique for determining the residual stresses is through nanoindentation. Nanoindentation is the use of instrumented indentation to determine the mechanical behavior and properties of a small volume based on the load versus depth results. By applying nanoindentation techniques to a DED Ti-6Al-4V, it was found that the nanoindentation results varied based on the cross-sectional height of the sample. The reason for this occurrence was believed to be due to the microstructure and the existence of residual stresses. The nanoindentation results were then used to quantify the residual stresses present in the DED Ti-6Al-4V part using the basic methodology of Suresh and Giannakopoulos. Similar to the nanoindentation hardness and elastic modulus results determined, the residual stresses also showed an increasing trend when increasing in height along the cross-section. More specifically, as the height along the build direction increased, the residual stresses present increased in compressive behavior. However, future work is required to verify the validity of the Suresh model and its application to DED Ti-6Al-4V. Ultimately, by understanding the material characteristics of this part, it would help to further enhance the structural integrity of AM parts.
Download or read book Image Processing based Techniques for Process Parameter Characterization in Plasma Transferred Arc Additive Manufacturing PTA AM Process written by Raviraj Gajbhiye and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The plasma transferred arc additive manufacturing (PTA-AM) process is a recently established additive manufacturing (AM) technique for manufacturing large parts for the resource industries. In the PTA-AM process, the build quality of the 3D part is governed by various processing parameters, including but not limited to plasma arc current, stand-off distance (SOD) and powder flow rate. The PTA-AM is challenging for in-process monitoring due to the complex interaction among the plasma arc, powder stream and substrate. Any instability in these processing parameters affects the overall build quality of the component, inducing non-conformance to geometrical properties. In the AM field, various high-speed imaging techniques are used to investigate the correlation between the processing parameter variation contributing to quality fluctuations of the final 3D product. This thesis presents the in-situ image processing methodologies to quantify and analyze the process aspects of the emergent PTA-AM system. Firstly, the single-track multi-layer bead deposition experiments of WC-reinforced NiCrBSi composites are carried out on a PTA-AM system and recorded with a high-speed camera. The optimized SOD has been determined from image analysis, contributing to the uniform deposition with quality deviation. The image analyzed SOD is validated with the experimentally determined SOD. This information is also used to evaluate the impact of powder variation on bead layer height. Secondly, the proposed in-situ image processing technique has been employed to describe the relationship between powder stream distribution and build geometry variation. In addition, the effect of plasma arc current on bead layer geometry (height and width) is also investigated. The Analysis of variance and t-tests has checked the significance of build quality dependence on powder and plasma arc variation. It is well-known that the powder flow behaviour (the particle trajectories and velocities) under the plasma arc region is a complex but crucial physical phenomenon that affects the geometric dimensions and the bead deposition characteristics in PTA-AM. Therefore, we proposed another image processing methodology to investigate the powder stream behaviour under the influence of the plasma arc region. In the findings, variation in trajectories and impact velocities of individual powder particles due to plasma arc has been observed. Using the single-particle trajectory model, we validated that the results are within the theoretical range. Later, based on calculated impact velocities of powder particles, the parametric study was conducted to predict the spreading and solidification of molten powder particles on the substrate. Using dimensionless numbers, the parametric effect of hydrodynamic forces (Weber and Reynolds number) and thermophysical forces (Stefan and Peclet number) on the impinging melted powder particles is also studied.
Download or read book Process Control and Development in Wire and Arc Additive Manufacturing written by P. M. Sequeira Almeida and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes advancements in the modelling, optimisation, process control and mechanical performance of novel high deposition rate gas metal arc welding processes for large scale additive manufacturing applications. One of the main objectives of this study was to develop fundamental understanding of the mechanisms involved during processing with particular focus on single layer welds made of carbon steel using both pulsed-current gas metal arc welding and cold metal transfer processes. The effects of interactions between critical welding process variables and weld bead and plate fusion characteristics are studied for single and multi-layers. It was shown that several bead and plate fusion characteristics are strongly affected by the contact tip to work distance, TRIM, wire feed speed, wire feed speed to travel speed ratio, and wire diameter in pulsed-current gas metal arc welding. The arc-length control, dynamic correction and the contact tip to work distance are shown to strongly influence the weld bead geometry in the cold metal transfer process. This fundamental knowledge was essential to ensure the successful development of predictive interaction models capable of determining the weld bead geometry from the welding process parameters. The models were developed using the least-squares analysis and multiple linear regression method. The gas tungsten constricted arc welding process was utilised for the first time for out-of-chamber fabrication of a large scale and high-quality Ti-6Al-4V component. The main focus was, however, in the use of the cold metal transfer process for improving out-of-chamber deposition of Ti-6Al-4V at much higher deposition rates. The effect of the cold metal transfer process on the grain refinement features in the fusion zone of single layer welds under different torch gas shielding conditions was investigated. It was shown that significant grain refinement occurs with increasing helium content. The morphological features and static mechanical performance of the resulting multi-layered Ti-6Al-4V walls were also examined and compared with those in gas tungsten constricted arc welding. The results show that a considerable improvement in static tensile properties is obtained in both testing directions with cold metal transfer over gas tungsten constricted arc welding. It was suggested that this improvement in the mechanical behaviour could be due to the formation of more fine-grained structures,which are therefore more isotropic. The average ultimate tensile strength and yield strength of the as-deposited Ti-6Al-4V material processed via cold metal transfer meet the minima specification values recommended for most Ti-6Al-4V products. Neutron diffraction technique was used to establish the effect of repeated thermo-mechanical cycling on the generation, evolution and distribution of residual stresses during wire and arc additive manufacturing. The results show a significant redistribution of longitudinal residual stresses along both the substrate and multi-bead with repeated deposition. However, a nearly complete relaxation occurs along the built, once the base plate constraint is removed.
Download or read book Additive Manufacturing of Titanium Alloys written by Bhaskar Dutta and published by Butterworth-Heinemann. This book was released on 2016-06-17 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additive Manufacturing of Titanium Alloys: State of the Art, Challenges and Opportunities provides alternative methods to the conventional approach for the fabrication of the majority of titanium components produced via the cast and wrought technique, a process which involves a considerable amount of expensive machining. In contrast, the Additive Manufacturing (AM) approach allows very close to final part configuration to be directly fabricated minimizing machining cost, while achieving mechanical properties at least at cast and wrought levels. In addition, the book offers the benefit of significant savings through better material utilization for parts with high buy-to-fly ratios (ratio of initial stock mass to final part mass before and after manufacturing). As titanium additive manufacturing has attracted considerable attention from both academicians and technologists, and has already led to many applications in aerospace and terrestrial systems, as well as in the medical industry, this book explores the unique shape making capabilities and attractive mechanical properties which make titanium an ideal material for the additive manufacturing industry. - Includes coverage of the fundamentals of microstructural evolution in titanium alloys - Introduces readers to the various Additive Manufacturing Technologies, such as Powder Bed Fusion (PBF) and Directed Energy Deposition (DED) - Looks at the future of Titanium Additive Manufacturing - Provides a complete review of the science, technology, and applications of Titanium Additive Manufacturing (AM)
Download or read book Additive Manufacturing written by Amit Bandyopadhyay and published by CRC Press. This book was released on 2015-09-08 with total page 547 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of additive manufacturing has seen explosive growth in recent years due largely in part to renewed interest from the manufacturing sector. Conceptually, additive manufacturing, or industrial 3D printing, is a way to build parts without using any part-specific tooling or dies from the computer-aided design (CAD) file of the part. Today, mo
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 Thermal Spray Fundamentals written by Pierre L. Fauchais and published by Springer Science & Business Media. This book was released on 2014-01-24 with total page 1587 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides readers with the fundamentals necessary for understanding thermal spray technology. Coverage includes in-depth discussions of various thermal spray processes, feedstock materials, particle-jet interactions, and associated yet very critical topics: diagnostics, current and emerging applications, surface science, and pre and post-treatment. This book will serve as an invaluable resource as a textbook for graduate courses in the field and as an exhaustive reference for professionals involved in thermal spray technology.
Download or read book Metals Abstracts written by and published by . This book was released on 1993 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering Materials 2 written by Michael F. Ashby and published by Elsevier. This book was released on 2014-06-28 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a thorough explanation of the basic properties of materials; of how these can be controlled by processing; of how materials are formed, joined and finished; and of the chain of reasoning that leads to a successful choice of material for a particular application. The materials covered are grouped into four classes: metals, ceramics, polymers and composites. Each class is studied in turn, identifying the families of materials in the class, the microstructural features, the processes or treatments used to obtain a particular structure and their design applications. The text is supplemented by practical case studies and example problems with answers, and a valuable programmed learning course on phase diagrams.
Download or read book Handbook of Thermal Plasmas written by Maher I. Boulos and published by Springer Nature. This book was released on 2023-02-20 with total page 1973 pages. Available in PDF, EPUB and Kindle. Book excerpt: This authoritative reference presents a comprehensive review of the evolution of plasma science and technology fundamentals over the past five decades. One of this field’s principal challenges has been its multidisciplinary nature requiring coverage of fundamental plasma physics in plasma generation, transport phenomena under high-temperature conditions, involving momentum, heat and mass transfer, and high-temperature reaction kinetics, as well as fundamentals of material science under extreme conditions. The book is structured in five distinct parts, which are presented in a reader-friendly format allowing for detailed coverage of the science base and engineering aspects of the technology including plasma generation, mathematical modeling, diagnostics, and industrial applications of thermal plasma technology. This book is an essential resource for practicing engineers, research scientists, and graduate students working in the field.
Download or read book Introduction to Plastics Engineering written by Vijay K. Stokes and published by John Wiley & Sons. This book was released on 2020-04-02 with total page 1627 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authoritative introduction to all aspects of plastics engineering — offering both academic and industry perspectives in one complete volume. Introduction to Plastics Engineering provides a self-contained introduction to plastics engineering. A unique synergistic approach explores all aspects of material use — concepts, mechanics, materials, part design, part fabrication, and assembly — required for converting plastic materials, mainly in the form of small pellets, into useful products. Thermoplastics, thermosets, elastomers, and advanced composites, the four disparate application areas of polymers normally treated as separate subjects, are covered together. Divided into five parts — Concepts, Mechanics, Materials, Part Processing and Assembly, and Material Systems — this inclusive volume enables readers to gain a well-rounded, foundational knowledge of plastics engineering. Chapters cover topics including the structure of polymers, how concepts from polymer physics explain the macro behavior of plastics, evolving concepts for plastics use, simple mechanics principles and their role in plastics engineering, models for the behavior of solids and fluids, and the mechanisms underlying the stiffening of plastics by embedded fibers. Drawing from his over fifty years in both academia and industry, Author Vijay Stokes uses the synergy between fundamentals and applications to provide a more meaningful introduction to plastics. Examines every facet of plastics engineering from materials and fabrication methods to advanced composites Provides accurate, up-to-date information for students and engineers both new to plastics and highly experienced with them Offers a practical guide to large number of materials and their applications Addresses current issues for mechanical design, part performance, and part fabrication Introduction to Plastics Engineering is an ideal text for practicing engineers, researchers, and students in mechanical and plastics engineering and related industries.
Download or read book Metal Additive Manufacturing written by Robert J. Lancaster and published by Trans Tech Publications Ltd. This book was released on 2020-12-01 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aggregated Book
Download or read book Concepts Applications and Emerging Opportunities in Industrial Engineering written by Gary Moynihan and published by BoD – Books on Demand. This book was released on 2021-01-07 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: From their initial focus in manufacturing, the industrial engineering principles, tools, and techniques have spread across a spectrum of application areas. Topics covered in this book apply to this continuum of application, including operations planning, safety, quality, production control, inventory management, operations research, supply chain management, and continuous improvement. This edited book comes at an opportune time. It incorporates new knowledge and expertise in a rapidly changing engineering discipline that is a vital force in a wide range of manufacturing, service, educational, and government organizations. Such concepts as lean systems, sustainability, systems thinking, data analytics, and additive manufacturing, as well as utilization of advanced computer software, have further expanded industrial engineering's breadth. Each chapter reflects important aspects of these advances.
Download or read book Advances in Production and Industrial Engineering written by P. M. Pandey and published by Springer Nature. This book was released on 2020-09-20 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises the select proceedings of the International Conference on Emerging Trends in Mechanical and Industrial Engineering (ICETMIE) 2019. The conference covers current trends in thermal, design, industrial, production and other sub-disciplines of mechanical engineering. This volume focuses on different industrial and production engineering areas such as additive manufacturing, rapid prototyping, computer aided engineering, advanced manufacturing processes, manufacturing management and automation, sustainable manufacturing systems, metrology, manufacturing process optimization, operations research and decision-making models, production planning and inventory control, supply chain management, and quality engineering. The contents of this book will be useful for students, researchers and other professionals interested in industrial and production engineering.
Download or read book Joining of Titanium written by Robert Edward Monroe and published by . This book was released on 1967 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report supplies information on joining processes applicable to titanium and its alloys in sheet metal applications, primarily related directly to airframe construction. Although the material presented here does not cover all titanium joining processes, and omits such processes as plasma-arc, submerged-arc, electroslag, flash, and high-frequency resistance welding, the data presented cover materials up to 2-inches thick in some cases and the report should be useful to anyone seeking titanium joining information. The joining processes covered fall into five categories: welding, brazing, metallurgical bonding (diffusion and deformation bonding), adhesive bonding, and mechanical fastening. The fusion welding processes that are discussed in detail include gas tungsten arc, gas metal arc, arc spot, and electron beam. The resistance processes give extended coverage are spot, roll spot, and seam welding. (Author).
Download or read book TMS 2017 146th Annual Meeting Exhibition Supplemental Proceedings written by The Minerals, Metals & Materials Society TMS and published by Springer. This book was released on 2017-02-18 with total page 777 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection features papers presented at the 146th Annual Meeting & Exhibition of The Minerals, Metals & Materials Society.
