Download or read book Optimizing Quality of Additively Manufactured Inconel 718 Using Powder Bed Laser Melting Process written by Magda Dominique Sadowski and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optimizing Quality of Additively Manufactured Inconel 718 Using Powder Bed Laser Melting Process written by Magda Dominique Sadowski and published by . This book was released on 2016 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Additively Manufactured Inconel 718 written by Dunyong Deng and published by Linköping University Electronic Press. This book was released on 2018-01-24 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Correlation and Effect of Process Parameters on the Properties of Inconel 718 Parts Fabricated by Selective Laser Melting Using Response Surface Method written by Bharath Bhushan Ravichander and published by . This book was released on 2020 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inconel 718 (i.e., IN718) is a nickel-based superalloy that exhibits outstanding tensile and impact resistant properties, along with good high-temperature corrosion resistance. However, the machinability is poor due to the high stiffness of IN718. Therefore, additive manufacturing provides an effective solution to overcome the work hardening. Selective laser melting (SLM) is the most common powder-bed additive manufacturing technique designed to use a high power-density laser to melt and fuse the metallic powder to fabricate functional parts with high accuracy. However, the accuracy and the functional properties of the fabricated parts are greatly dependent on the process parameters. Thus, depending on the desired properties,the process parameters for a given material need to be optimized for improving the overall reliability of the SLM devices. The processing parameters that control the SLM process comprise of the laser power, scan speed, hatch spacing, and layer thickness. These process parameters are dependent on each other and therefore making the task of optimizing the process parameters an important one. One of the biggest advantages of optimizing these above-mentioned process parameters is it enables us to control the microstructure as per the requirements. It is important to regulate the microstructure to control the mechanical properties such as tensile strength, yield strength, impact intensity and toughness,as it will directly influence the grain and melt pool distribution in the fabricated parts. As the number of combinations increases, the probability of failure of these additively manufactured parts increases exponentially. As all the process parameters are inter-dependent on each other, finding an optimum value to suit the requirement and render the best build quality both in terms of computer-aided design (CAD) accuracy and desired metallurgical properties is necessary. Thus, it is essential to determine and establish the optimum combination of values for process parameters. Design of Experiments (DOE) methodology was used to construct an experiment that evaluated the CAD deviation, composition, hardness and roughness of SLM fabricated IN718 against the three critical processing parameters: laser power, scanning speed and hatch spacing. This work primarily focuses on the effect of various process parameters on the metallurgical properties and mechanical properties of Inconel 718 parts fabricated on an EOS M290 machine.

Download or read book Selective Laser Melting written by Prashanth Konda Gokuldoss and published by MDPI. This book was released on 2020-04-03 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additive manufacturing (AM) is one of the manufacturing processes that warrants the attention of industrialists, researchers, and scientists. AM has the ability to fabricate materials to produce parts with complex shapes without any theoretical restrictions combined with added functionalities. Selective laser melting (SLM), also known as laser-based powder bed processing (LPBF), is one of the main AM process that can be used to fabricate wide variety of materials that are Al-, Ti-, Fe-, Ni-, Co-, W-, Ag-, and Au-based, etc. However, several challenges need to be addressed systematically, such as development of new materials that suit the SLM process conditions so the process capabilities can be fully used to produce new properties in these materials. Other issues in the field are the lack of microstructure–property correlations, premature failure, etc. Accordingly, this Special Issue (book) focuses mainly on the microstructure-correlation in three different alloys: AlSi10Mg, Ti6Al4V, and 304L stainless steel, where six articles are presented. Hence, this Special Issue outlines microstructure–property correlations in the SLM processed materials and provides a value addition to the field of AM.

Download or read book Optimization on Distortion of Fabricated Part with Inconel 718 in Laser Powder Bed Fusion Process written by 張友誠 and published by . This book was released on 2020 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laser Powder Bed Fusion of Additive Manufacturing Technology written by Di Wang and published by Springer Nature. This book was released on 2023-10-06 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book systematically introduces the powder bed laser melting technology and its application and summarizes the author's team's experience in scientific research, engineering development, and data accumulation in recent 15 years. It includes in-depth theoretical analysis and a lot of engineering experience in equipment debugging, process development, and material testing. The book takes the powder bed laser melting technology as the object and divides the content into 15 chapters. It is used as technical learning materials for researchers and engineering development personnel engaged in metal 3D printing.

Download or read book Influence of Thermal Post Processing on the Microstructure and Mechanical Behavior of the Additively Manufactured Inconel 718 Superalloy Using the Laser Powder Bed Fusion Process written by Eslam Mohamed Mahmoud Mohamed Fayed and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface Integrity and Energy Consumption in Machining of Inconel 718 Produced by Selective Laser Melting written by Daniel James Brown and published by . This book was released on 2017 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of additive manufacturing (AM) in the past decade has brought along with it a number of new opportunities and challenges when it comes to how parts are manufactured. While this development represents an increase in the capabilities and performance of the AM parts, much work and research still needs to be done in order to ascertain how to avoid the limitations that plague AM such as low dimensional accuracy, high surface roughness, and large tensile residual stress. Ongoing efforts to improve part quality through process optimization of parameters such as scan speed and laser power, post heat treatment, or machining, are currently being pursued to mitigate these limitations, and it is likely that the fabrication of a functional part lies within the use of all of these efforts. Little study has been done to characterize surface integrity of an as-SLM part followed by milling (e.g., hybrid SLM-milling). In this paper, surface integrity including surface roughness, microstructure, and microhardness have been characterized for the IN718 samples processed by the hybrid process. It has been found that surface integrity can be significantly improved by the hybrid SLM-milling route. To investigate the machinability of the deposited materials, energy consumption was collected and analyzed in terms of specific energy between dry and flood milling of as-SLM IN718, dry-milling of conventional IN718, and flood-milling of conventional IN718. Energy consumption was the lowest for both flood milling cases compared to the dry milling case, and the lowest for both as-SLM cases in comparison to the conventionally produced cases.

Download or read book Grain Structure Modification in Additively Manufactured Inconel 718 Using in Situ Ultrasonic Vibration written by Nathaniel Gregory McNees and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser Powder Bed Fusion (L-PBF) is a branch of metal additive manufacturing technologies which has become increasingly more popular due to the geometric freedoms and strategic design methods which it allows. L-PBF produces metallic components to near net shape within a single process step while simultaneously allowing for the creation of complex geometries and internal structures which are not readily produced by other manufacturing techniques. Not without issues, L-PBF produces materials with preferential directions of growth in the underlying material microstructure as well as undesirable phase content in many cases. While techniques exist to change microstructure of L-PBF materials, many rely on post-processing or in situ control over the flow of heat. This thesis documents the development and analysis of a novel technique separate from previous methods which allows for in situ modification of grain structure produced in LPBF without the need of complex modification of the machine. Ultrasonic vibrations are introduced to the build process as an added parameter, hypothesizing that in situ ultrasonic cavitation will reduce grain size and modify the formation of secondary phases in a way that is beneficial to the as-manufactured material properties.

Download or read book Nickel Cobalt and Their Alloys written by Joseph R. Davis and published by ASM International. This book was released on 2000-01-01 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a comprehensive guide to the compositions, properties, processing, performance, and applications of nickel, cobalt, and their alloys. It includes all of the essential information contained in the ASM Handbook series, as well as new or updated coverage in many areas in the nickel, cobalt, and related industries.

Download or read book Parametric Investigation and Optimization for Inconel 718 Nickel based Superalloy in Laser Powder Bed Fusion written by Thinh Huu Huynh and published by . This book was released on 2020 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excellent weldability and high temperature stability make Inconel 718 (IN718) one of the most desired alloys to be produced by additive manufacturing (AM). Within the flourishing field of AM technology, laser powder bed fusion (LPBF) is a popular prospective candidate capable of fabricating complex and near net-shape engineering components that traditional manufacturing methods cannot accomplish. In this study, the effects of processing parameters on the relative density and microstructure was investigated. Gas atomized IN718 powders were used to fabricate cuboidal specimens via LPBF for metallographic characterization. The specimens were printed with independently varied laser power (125 - 350W), laser scan speed (200 - 2200 mm/s), and laser scan rotation (0° - 90°). Archimedes’ method, optical microscopy, and scanning electron microscopy were employed to assess the influence of LPBF parameters on part density and microstructure, respectively. In general, relative density greater than 99.5% was achieved for a wide range of energy density between 50 and 100 J/mm3. At higher laser powers, larger processing windows to produce high density parts were documented. Microstructural features including melt pool geometry, lack of fusions defects, keyhole porosity, and grain structure were examined and correlated to a wide range of LPBF parameters. The cellular microstructure within grains was observed to decrease with increasing laser scan speed. Based on the measurement of cellular structures and Rosenthal models, cooling rate in LPBF was estimated to be in the order of 105 – 105 K/s.

Download or read book Modeling and Characterization of Mechanical Properties in Laser Powder Bed Fusion Additive Manufactured Inconel 718 written by Senthamilaruvi Moorthy and published by . This book was released on 2018 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Very High Cycle Fatigue Behavior of Laser Beam powder Bed Fused Inconel 718 Considering the Layer Orientation and Surface Finish Effects written by Palmer R. Frye and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Additive Manufacturing (AM) techniques have recently gained popularity for fabrication of parts used in aerospace applications. Some of these parts may be subjected to cyclic loading at very high frequencies, leading to service life requirements exceeding ten-million cycles (>10107 cycles). Therefore, understanding the very high-cycle fatigue (VHCF) behavior of these AM parts is an important step in their design and qualification processes. In this thesis, both high-cycle fatigue (HCF) and VHCF behaviors of Inconel 718, a Ni-base superalloy, manufactured via a Laser Beam-Powder Bed Fusion (LB-PBF) process, are investigated. Uniaxial, fully reversed force-controlled fatigue tests were conducted utilizing a ultrasonic fatigue test system operating at 20 kHz. Specimen fracture surfaces were analyzed using a scanning electron microscope (SEM). Fatigue test specimens were fabricated in two different build orientations, including vertical and 45 degrees (i.e., diagonal) with respect to the build plate, and subjected to a post-process solution annealing and aging heat treatment. In addition, specimens were testing in both the as-built and post-process machined condition. Fatigue response of LB-PBF Inconel 718 was compared to that of wrought Inconel 718. Comparison of the stress-life (S-N) response of LB-PBF Inconel 718 fabricated in the vertical and diagonal build orientations showed almost no discrepancy in fatigue life for the as-built condition. For machined LB-PBF specimens, the effects of build layer orientation were more apparent: fatigue resistance of vertically oriented specimens was superior to diagonally oriented specimens. An increase in fatigue resistance of LB-PBF Inconel 718 was observed for specimens of the machined surface condition due to the removal of surface defects from the as-built surface. AM process induced defects significantly influenced fatigue crack initiation for as-built specimens: all fatigue cracks in as-built specimens originated from either surface micro-notches or sub-surface lack of fusion. Fatigue cracks in all specimens, regardless of build orientation and surface quality, were found to initiate from both specimen surfaces and sub-surface anomalies in the microstructure. Fatigue limit estimation was performed using Murakami's approach, which accounts for AM process induced defects. Additionally, S-N curve fitting was performed using the Basquin equation. Despite the presence of defects seen on VHCF fractures of as-built vertical specimens, the Murakami model proved to be insufficient for the specimens used in this study.

Download or read book Laser Additive Manufacturing of Metallic Materials and Components written by Dongdong Gu and published by Elsevier. This book was released on 2022-12-07 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser Additive Manufacturing of Metallic Materials and Components discusses the current state and future development of laser additive manufacturing technologies, detailing material, structure, process and performance. The book explores the fundamental scientific theories and technical principles behind the elements of laser additive manufacturing, touching upon scientific and technological challenges faced by laser additive manufacturing technology. This book is suitable for those who want to further “understand and “master laser additive manufacturing technology and will expose readers to innovative industrial applications that meet significant demand from aeronautical and astronautical high-end modern industries for low-cost, short-cycle and net-shape manufacturing of structure-function integrated metallic components. With the increasing use of industrial applications, additive manufacturing processes are deepening, with technology continuing to evolve. As new scientific and technological challenges emerge, there is a need for an interdisciplinary and comprehensive discussion of material preparation and forming, structure design and optimization, laser process and its control, microstructure and performance characterization, and innovative industrial applications, hence this book covers these important aspects. Highlights an integration of material, structure, process and performance for laser additive manufacturing of metallic components to reflect the interdisciplinary nature of this technology Covers cross-scale structure and performance coordination mechanisms, including micro-scale material microstructure control, meso-scale interaction between laser beam and particle matter, and macro-scale precise forming of components and performance control Explores fundamental scientific theories and technical principles behind laser additive manufacturing processes Provides innovation elements and strategies for the future sustainable development of additive manufacturing technologies in terms of multi-materials design, novel bio-inspired structure design, tailored printing process with meso-scale monitoring, and high-performance and functionality of printed components

Download or read book Investigation of the Microstructure and Mechanical Properties in Additive Manufactured Inconel 718 by Direct Metal Laser Sintering DMLS System written by Bryton L. Farber and published by . This book was released on 2016 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additive Manufacturing (AM) has evolved since its inception around the 1970s. This type of manufacturing essentially builds a part by fusing material powder with the use of a laser or electron beam. Certain processing parameters, such as the scanning speed of the laser, the overlap rate of melt tracks and the incremental layer height control the final structure of the part and thus their mechanical properties. Prototype and single use parts were at the forefront of use for AM, however, in recent years the technology has developed to take the next step into production parts for use in real-world applications. One common material used for high temperature and corrosive environments is Inconel 718. This material is a nickel-based alloy typically used in different areas of the aerospace and energy industries. The mechanical properties of Inconel 718 produced through AM methods have proven to not match those produced through conventional means. Since these processed are new to the manufacturing world, it is important to understand where the loss in properties come from but also, and perhaps more importantly, how to make improvements. In this study, standard processing methods were implemented and their effects examined from changes of microstructure to mechanical properties. Generally, a textured columnar microstructure (of varying sizes) developed from the building process. A typical solution and aging treatment used for wrought Inconel 718 produced a non-normal precipitate structure which led to high mechanical strengths. By way of Hot Isostatic Pressing, the microstructure under goes a reecrystallization process, altering some of the properties including texture and , with it the elastic modulus for the better, while other properties such as hardness and yield strength were diminished.

Download or read book Fundamentals of Diffraction based Residual Stress and Texture Analysis of Laser Powder Bed Fused Inconel 718 written by Jakob Schröder and published by . This book was released on 2023* with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additive manufacturing (AM) processes enable the production of metal structures with exceptional design freedom, of which laser powder bed fusion (PBF-LB) is one of the most common. In this process, a laser melts a bed of loose feedstock powder particles layer-by-layer to build a structure with the desired geometry. During fabrication, the repeated melting and rapid, directional solidification create large temperature gradients that generate large thermal stress. This thermal stress can itself lead to cracking or delamination during fabrication. More often, large residual stresses remain in the final part as a footprint of the thermal stress. This residual stress can cause premature distortion or even failure of the part in service. Hence, knowledge of the residual stress field is critical for both process optimization and structural integrity. Diffraction-based techniques allow the non-destructive characterization of the residual stress fields. However, such methods require a good knowledge of the material of interest, as certain ...