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Academic literature on the topic 'Inconel 718'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 January 2025

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Journal articles on the topic "Inconel 718"

Zheng, Jin, Yaoman Zhang, and Hanying Qiao. "Milling Mechanism and Chattering Stability of Nickel-Based Superalloy Inconel 718." Materials 16, no. 17 (August 22, 2023): 5748. http://dx.doi.org/10.3390/ma16175748.

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Nickel-based superalloy Inconel 718 is widely used in the aerospace industry for its excellent high-temperature strength and thermal stability. However, milling Inconel 718 presents challenges because of the significantly increased cutting force and vibration, since Inconel 718 is a typical difficult-to-machine material. This paper takes the milling process of Inconel 718 as the research object, initially, and a milling force model of Inconel 718 is established. Subsequently, the finite element analysis method is used to analyze the stress field, temperature field, and milling force in the milling process of Inconel 718. Building upon this, a dynamic equation of the milling of Inconel 718 is established, and based on the modal experiment, stability lobe diagrams are drawn. Furthermore, milling experiments on Inconel 718 are designed, and the results calculated using the milling force model and finite element analysis are verified through comparison to the experimental results; then, the fmincon optimization algorithm is used to optimize the processing parameters of Inconel 718. Eventually, the results of the multi-objective optimization illustrate that the best processing parameters are a spindle speed of 3199.2 rpm and a feed speed of 80 mm/min with an axial depth of cut of 0.25 mm. Based on this, the best machining parameters are determined, which point towards an improvement of the machining efficiency and quality of Inconel 718.

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Makhofane, Milton M., Hertzog Bissett, Andrei V. Kolesnikov, Kasturie Premlall, and Ryno van der Merwe. "Plasma spheroidisation of Inconel 718." MATEC Web of Conferences 406 (2024): 03007. https://doi.org/10.1051/matecconf/202440603007.

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In this study, size fractions of 45-63 µm and 63-75 µm, irregular shaped Inconel 718 powders were spheroidised utilising the Tekna plasma system. The effect of plasma power and powder feed rate on the percentage spheroidisation of Inconel powder particles were investigated. The results proved that the Tekna plasma system can effectively spheroidise irregular shaped Inconel 718 powder particles. The flowability of the spheroidised Inconel 718 powder was significantly improved.

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Zhao, Heng, Qing Bin Liu, Gang Lee, and Da Wei Yao. "The Addition of Zr in Nickel-Based Inconel 718 Superalloy to Prevent Hot Cracks Propagation." Key Engineering Materials 727 (January 2017): 3–8. http://dx.doi.org/10.4028/www.scientific.net/kem.727.3.

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The Inconel 718 alloy owes high strength and ductility at high temperature due to precipitation strengthening. In order to upgrade productility of Inconel 718 alloy, the Inconel 718 alloy solve hot crackings through Zr additions. The result shows that, the Inconel 718 alloy with Zr addition achieves grain size refinement and homogenization effect. It is suggested that, homogenization process, such as temperature point and time control, realizes low content of Nb segregation which is the key to prevent hot crackings. At the same time, through dendrite space measurement, the grain refinement realize high productivity of forged Inconel 718 alloy, as a another method of soft effect. In conclusion, adding Zr element is one of dominant methods for producing high quality of Inconel 718 alloy.

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Ha, Seong-Ho, Jaegu Choi, and Dong-Hyuk Kim. "Investigating Oxide Formation and Growth in Inconel 718 Oxidized at High Temperatures." Journal of Nanoelectronics and Optoelectronics 19, no. 10 (October 1, 2024): 1007–10. http://dx.doi.org/10.1166/jno.2024.3655.

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In this study, oxide formation and growth in Inconel 718 oxidized at 1,000 °C and 1,100 °C were investigated using scanning electron microscopy and phase diagrams including oxygen partial pressure. Inconel 718 showed significantly improved oxidation resistance compared to that of Nickel 201 with no alloying elements. The oxide layer of Inconel 718 consisted of a Cr-rich upper layer and Nb-rich lower layer. In addition, the oxide layer of Inconel 718 at 1,100 °C was significantly Ti-enriched. NiO crystals were found to be oxidized on Nickel 201, which were grown long in the thickness direction, whereas the oxide layer composed of fine and equiaxed Cr2O3 crystals was observed in the case of Inconel 718. Based on the phase diagram plotted for the oxygen partial pressure, primary Cr2O3, secondary Nb2O, and Nb2O5 were followed by spinel oxide formation in Inconel 718.

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Ren, Jia Long, Qing Yu Zheng, Ren He, and Chun Yan Zhang. "The Cutting Simulation of Inconel 718." Applied Mechanics and Materials 43 (December 2010): 717–21. http://dx.doi.org/10.4028/www.scientific.net/amm.43.717.

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The chemical composition and properties of nickel-based superalloy Inconel 718 was investigated first. Turning Inconel 718 was simulated by Deform-3D software to figure out main affection factors, and optimal combination of cutting speed, feed rate and cutting depth was introduced. In addition, different cooling and Lubrication methods (heat transfer coefficient f of cooling and tool-chip friction factors) for cutting of Inconel 718 was studied, and a best cooling/lub mode was obtained.

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Aggarwal, Vivek, Rajiv K. Garg, and Sehijpal Singh Khangura. "Technological Innovations in Machining of Inconel 718." International Journal of Manufacturing, Materials, and Mechanical Engineering 5, no. 2 (April 2015): 17–43. http://dx.doi.org/10.4018/ijmmme.2015040102.

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In this paper, a thorough review has been presented on the latest research work carried out for the enhancement of machining performance of one of the most commonly used superalloys that is, Inconel 718. The thermal energy has been frequently utilized for improving machinability characteristics of Inconel 718. The review of available literature indicates that plasma, laser, and electric discharge have been the major sources used for the enhancement of tool life, material removal rate, surface integrity, and reduction of cutting forces during machining of Inconel 718. However, a very few efforts have been made as regards to the use of wire electrical discharge machining and other energies like mechanical, electrochemical, and chemical for machining of this material. Moreover, the reported work on machining of Inconel 718 is largely focused on drilling operations. There is ample scope for research work on various other machining operations using alternative energies to gain more insight into machining of Inconel 718 and other similar superalloys.

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Zeng, Jun Ling, Wan Xiu Hai, Jun Hu Meng, and Jin Jun Lu. "Friction and Wear of Ti₃SiC₂-Ag/Inconel 718 Tribo-Pair under a Hemisphere-on-Disk Contact." Key Engineering Materials 602-603 (March 2014): 507–10. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.507.

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Room temperature friction and wear of Ti3SiC2-Ag sliding against Inconel 718 with a hemisphere-on-disc configuration were investigated in air. The effects of Ag content and TiAlN coating on Inconel 718 substrate were also included. Ti3SiC2/Inconel 718 tribo-pair showed high friction coefficient (0.6) and severe wear due to pullout of Ti3SiC2 grains was observed at a sliding speed of 1 m/s. Ti3SiC2-Ag composites had better tribological behavior than that of monolithic Ti3SiC2 in sliding against Inconel 718. At a sliding speed of 0.01 m/s, Ti3SiC2-Ag/Inconel 718 tribo-pairs exhibited moderate friction coefficient (0.32-0.4). At a sliding speed of 1 m/s, severe wear was not observed for Ti3SiC2-15vol.%Ag and Ti3SiC2-20vol.%Ag composites although the tribo-layer was not rich in Ag. When Ti3SiC2-Ag composites mated with TiAlN coating on Inconel 718 substrate, moderate friction coefficient (0.29-0.36) and low wear rate (10-6 mm3N-1m-1) were obtained at 0.01 m/s. A transition from mild wear to severe wear of Ti3SiC2-Ag composites at 0.1 m/s can be attributed to the ploughing effect by hard asperities on TiAlN coating.

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Haidong, Zhao, Zou Ping, Ma Wenbin, and Zhou Zhongming. "A Study on Ultrasonic Elliptical Vibration Cutting of Inconel 718." Shock and Vibration 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/3638574.

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Inconel 718 is a kind of nickel-based alloys that are widely used in the aerospace and nuclear industry owing to their high temperature mechanical properties. Cutting of Inconel 718 in conventional cutting (CC) is a big challenge in modern industry. Few researches have been studied on cutting of Inconel 718 using single point diamond tool applying the UEVC method. This paper shows an experimental study on UEVC of Inconel 718 by using polycrystalline diamond (PCD) coated tools. Firstly, cutting tests have been carried out to study the effect of machining parameters in the UEVC in terms of surface finish and flank wear during machining of Inconel 718. The tests have clearly shown that the PCD coated tools in cutting of Inconel 718 by the UEVC have better performance at 0.1 mm depth of cut as compared to the lower 0.05 mm depth of cut and the higher 0.12 or 0.15 mm depth of cut. Secondly, like CC method, the cutting performance in UEVC increases with the decrease of the feed rate and cutting speed. The CC tests have also been carried out to compare performance of CC with UEVC method.

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Isik, Murat. "Additive manufacturing and characterization of a stainless steel and a nickel alloy." Materials Testing 65, no. 3 (March 1, 2023): 378–88. http://dx.doi.org/10.1515/mt-2022-0278.

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Abstract Recently, additive manufacturing is of interest, and there is a trend to study additively manufactured materials such as Inconel 718 and 316L stainless steel. Additive manufacturing brings the easiness of production of complex geometries, avoids expensive tools, helps achieve interesting microstructures and obtaining promising results for future applications. Since the additive procedure is sensitive to many fabrication variables thereby affecting the microstructure and mechanical properties. This motivation promotes investigating the additively manufactured microstructure of 316L stainless steel and Inconel 718. While 316L stainless steel was fabricated using an electron-based powder bed fusion manner, directed energy deposition was preferred for Inconel 718. Samples were examined utilizing optical and scanning electron microscopes. Results suggest processing of 316L stainless steel gives rise to the same porosity rate as Inconel 718. Bimodal equiaxed austenite grain morphology was observed whereas no dendrite presence was detected for 316L stainless steel. Additive manufacturing types do not cause a significant change in the level of porosity for Inconel 718 alloy. Unlike the case of stainless steel, additive manufacturing results in dendritic microstructure formation in Inconel 718 whereas powder bed fusion-type production triggers a better refinement compared to that of directed energy deposition.

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Mohandas, Naveen Karuthodi, Alex Giorgini, Matteo Vanazzi, Ton Riemslag, Sean Paul Scott, and Vera Popovich. "Hydrogen Embrittlement of Inconel 718 Manufactured by Laser Powder Bed Fusion Using Sustainable Feedstock: Effect of Heat Treatment and Microstructural Anisotropy." Metals 13, no. 2 (February 17, 2023): 418. http://dx.doi.org/10.3390/met13020418.

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This study investigated the in-situ gaseous (under 150 bar) hydrogen embrittlement behaviour of additively manufactured (AM) Inconel 718 produced from sustainable feedstock. Here, sustainable feedstock refers to the Inconel 718 powder produced by vacuum induction melting inert gas atomisation of failed printed parts or waste from CNC machining. All Inconel 718 samples, namely AM-as-processed, AM-heat-treated and conventional samples showed severe hydrogen embrittlement. Additionally, it was found that despite its higher yield strength (1462 ± 8 MPa) and the presence of δ phase, heat-treated AM Inconel 718 demonstrates 64% lower degree of hydrogen embrittlement compared to the wrought counterpart (Y.S. 1069 ± 4 MPa). This was linked to the anisotropic microstructure induced by the AM process, which was found to cause directional embrittlement unlike the wrought samples showing isotropic embrittlement. In conclusion, this study shows that AM Inconel 718 produced from recycled feedstock shows better hydrogen embrittlement resistance compared to the wrought sample. Furthermore, the unique anisotropic properties, seen in this study for Inconel 718 manufactured by laser powder bed fusion, could be considered further in component design to help minimise the degree of hydrogen embrittlement.

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Dissertations / Theses on the topic "Inconel 718"

Chen, Qiguang. "Fatigue and fracture in Inconel 718-copper-Inconel 718 explosion-bonded composites." Thesis, Massachusetts Institute of Technology, 1990. https://hdl.handle.net/1721.1/128798.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1990.
Title as it appears in the M.I.T. Graduate List, Feb. 1990: Fatigue and fracture in explosion-bonded Inconel 718-copper-Inconel 718 composites.
Includes bibliographical references.
by Chikuang Chen.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1990.

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Zhao, Mengxiong. "Ultrasonic fatigue study of Inconel 718." Thesis, Paris 10, 2018. http://www.theses.fr/2018PA100063/document.

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L’Inconel 718 est utilisé dans les disques de turbine des moteurs d’avion, de par sa haute résistance à la corrosion, à l’oxydation, au fluage et sa haute résistance mécanique à très haute température. Le nombre total de cycles de ces composants mécaniques s’élève à 109~1010 durant sa vie. Ils subissent des chargements de grande amplitude à faible fréquence, comme les forces centrifuges ou les contraintes thermiques mais aussi des chargements de faibles amplitudes à très haute fréquence, du aux vibrations des pales. Dans ce travail, on se propose d’étudier la fatigue à très grand nombre de cycles (VHCF) de l’Inconel 718 en utilisant des machines de fatigue ultrasonique, fonctionnant à 20KHz. Le système d’acquisition utilise des cartes NI et le logiciel LabView pour superviser la fréquence, la température, les déplacements durant toute la durée des tests. Des capteurs laser Keyence utilisant deux sondes pour les faces supérieure et inférieure de l’éprouvette permettent de capturer la fréquence et les modes de vibration. La différence entre les valeurs moyennes mesurées permet d’accéder à l’allongement de l’éprouvette, dû à l’auto-échauffement.3 types de matériaux avec différents traitements thermiques, AR, DA et DAHQ de l’ONERA et SAFRAN sont comparés. La différence au niveau de la taille de grain, de la phase, des précipités, … est analysée par micrographie métallographique en utilisant un microscope optique (MO) et un microscope électronique à balayage (MEB). Le comportement en traction quasi-statique et sous chargement cyclique contrainte-déformation est aussi proposé. La transition entre durcissement et adoucissement cyclique apparait à l’issue du traitement thermique. Finalement, les surfaces de ruptures sont observées en utilisant des caméras optiques et un MEB afin d’identifier les mécanismes de ruptures de l’Inconel 718 dans le domaine de la fatigue à très grand nombre de cycles
Inconel 718 is widely used in turbine disk of aeronautic engines, due to its high resistance to corrosion, oxidation, thermal creep deformation and high mechanical strength at elevated temperature. The total cycle of these mechanical components is up to 109~1010 during its whole lifetime. It endures high-amplitude low-frequency loading including centrifugal force or thermal stress, and also low-amplitude high-frequency loading came from vibration of blade.In this work, the very high cycle fatigue (VHCF) behaviour of Inconel 718 with self-heating phenomenon without any cooling is studied using ultrasonic fatigue system at 20KHz. Acquisition system is improved using NI capture card with LabView for monitoring the frequency, temperature, displacement and so on during all the tests. Keyence laser sensor with two probes at the top and bottom surfaces of the specimens is used to reveal the frequency and vibration mode. The difference of mean values between these two probes is the elongation of the specimen caused by self-heating phenomenon.Three sets of materials with different heat treatment, As-Received (AR), Directly Aged (DA) and Directly Aged High Quality (DAHQ) from ONERA and SAFRAN are compared. The difference of grain size, phase, precipitate particle, etc. is investigated by metallographic micrograph using optical microscope (OM) and scanning electron microscope (SEM). Quasi-static uniaxial tensile property and cyclic stress-strain response is also proposed. The transition from cyclic hardening to cyclic softening appears after aged heat treatment. Finally, fracture surfaces are observed using optical camera and scanning electron microscope in order to identify the mechanism of fracture of Inconel 718 in the VHCF domain

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Knock, Nathaniel Oscar. "CHARACTERIZATION OF INCONEL 718: USING THE GLEEBLE AND VARESTRAINT TESTING METHODS TO DETERMINE THE WELDABILITY OF INCONEL 718." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/396.

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Nickel based superalloys were developed to withstand the severe thermal and mechanical environment associated with rocket propulsion systems and jet engines. In many alloy systems the strength of a component rapidly deteriorates as the operating temperature increases. Nickel based superalloys, however, retain strength over a range of temperatures which includes the operating range for many propulsion systems. This improved performance is accomplished by a combination of solid-solution strengthening, precipitation strengthening and grain-boundary strengthening. Furthermore, super-alloy systems are designed for ease of fabrication, to include machining, welding and heat treating. Inconel 718 was developed to overcome problems with post-weld cracking that were common in precipitation hardened nickel based superalloys strengthened by γ’. Inconel 718 is strengthened by γ’’ and is less sensitive to cracking during post-weld thermal treatment. However, in some cases, compositional changes which improved the behavior of these alloys during stress relief actually led to greater difficulty during the joining process. Many approaches have been used to determine the hot-cracking sensitivity of Inconel 718. Historically, two approaches have been particularly valuable because of their repeatability, their ability to compare different alloy systems and their verisimilitude to actual fabrication. These are the Gleeble hot-ductility test and the Variable-Restraint (Varestraint) weld test. Varestraint samples were prepared as per standard preparation techniques and tested longitudinally with a GTAW. At a predetermined location a strain was applied perpendicular to weld direction. The applied strain varied from 0.25%, 0.5%, 1.0%, 2.0%, and 4.0%. The Inconel 718 yielded a maximum crack length of 0.6 mm with a saturation strain of 2.0%. Both the total crack length and the number of cracks did not have a saturation strain. Gleeble samples were prepared from rod stock and tested with standard methodology to determine the characteristic temperatures: nil ductility, nil strength, and ductility recovery temperature of Inconel 718. The samples were tested at various pull temperatures on-heating until the nil strength temperature then tested on-cooling with the nil strength temperature acting as the peak temperature. The nil strength temperature was 2273°F, nil ductility temperature was 2182°F, and the ductility recovery temperature was 1925°F. Both the Varestraint and Gleeble results were compared with relevant literature to determine the weldability of the Inconel 718. Four criteria were used to determine the weldability of Inconel 718 and in three of the four tests; the Inconel 718 had equal to or greater weldability than the compared materials. In the fourth test, the Inconel 718 demonstrated lower weldability than the compared alloy systems, however, Inconel 718 operates in different conditions specifically, the high temperature and pressure conditions mentioned above.

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Tavakoli, Manshadi Salar. "Laser assisted machining of Inconel 718 superalloy." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40803.

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This research work assesses the effect of Laser Assisted Machining (LAM) on the machinability of Inconel 718 using a triple layer coated carbide and a sialon ceramic tool. This study was motivated by issues related to poor machinability of IN718 under conventional machining operations. In this work a focused Nd:YAG laser beam was used as a localized heat source to thermally soften the workpiece prior to material removal. Finishing operations were assumed throughout the experiments. Optimization screening tests were performed over a wide range of cutting speeds (ranging from 100 to 500 m/min) and feeds (ranging from 0.125 to 0.5 mm/rev). Results showed a significant drop in all three components of cutting force when thermal softening caused by the laser power was in effect. These tests yielded the optimum cutting speed and feed to be 200 m/min and 0.25 mm/rev for the coated carbide and 300 m/min and 0.4 mm/rev for the ceramic tool. Under these optimum conditions tool life tests were carried out. Drastic increase in terms of the material removal rate (MRR) was demonstrated under LAM conditions as compared to conventional machining. A nearly %300 increase in MRR was established for the coated carbide tool while slightly reducing tool life, mainly because the coatings offering thermal and wear protection could not withstand the high temperatures associated with LAM. Nearly %800 increase in MRR for the ceramic tool was achieved while improving tool life (about %50). In all cases, improvements in surface finish and surface integrity were observed. The dominant mode of tool failure was observed to be average flank wear for all tools tested. However, the coated carbide tool exhibited signs of chipping and flaking in the coatings. The morphology of the chips produced was analyzed and it was shown that temperature and increased chip thickness were the main causes of transition from steady state to shear localized chip structure. Shear localized or sawtooth chips tended to
Cette recherche évalue l'effet de l’usinage assisté par Laser (UAL) sur l’usinabilité d'Inconel 718 en utilisant deux outils : Le premier est enrobé d’une triple couche de carbure et le second est en céramique sialon. Cette étude a été motivée par la difficulté d’usiner IN718 conventionnellement. Dans ce travail, un rayon laser Nd:YAG a été utilisé comme une source de chaleur localisée pour adoucir thermiquement la pièce avant l'usinage. Les expériences représentaient les opérations de finitions. Une optimisation a été exécutée à travers une sélection unitaire pour une large gamme de vitesses de coupes (aux limites de 100 à 500 m/min) et de vitesses d’avance (aux limites de 0.125 à 0.5 mm/rév). Les résultats ont manifesté une réduction significative dans toutes les trois composantes de la force de coupe quand l'adoucissement thermique provoqué par le laser était mis en effet. D’après les tests, les valeurs optimales de vitesse de coupe et d’avance sont 200 m/min et 0.25 mm/rév pour l’outil avec la couche de carbure et 300 m/min et 0.4 mm/rév pour l’outil en céramique. Dans ces conditions optimales, des épreuves de tenue d’outils ont été réalisées. Une augmentation du taux d’enlèvement de matière a été démontrée lors de l’application de l’UAL en comparaison à l’usinage conventionnel. Une augmentation dans le taux d’enlèvement de matière de 300% a été établie pour l’outil enrobé de carbure avec une légère réduction en tenue d’outil. La raison de cette réduction est le fait que ces couches qui offrent une protection thermique et une résistance d’usure ne pouvaient pas résister aux températures élevées associées à l’UAL. Une augmentation de 800% dans le taux d’enlèvement de matière a été accomplie pour l’outil en céramique avec une amélioration de tenue d’outils d’environ 50%. Dans tous les cas, une amélioration de l’intégrité de la surface à ét

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Yang, Libin. "Modelling of the inertia welding of Inconel 718." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/760/.

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In this study, the inertia welding process was studied by both an FEM model and three analytical models. The thermal analysis shows that there is a steep temperature gradient near the mating surface, which is the cause for the existence of a band of high hydrostatic stress near the weld line. The holding effect of this high static stress is the reason for the presence of the very soft material at the welding interface. The models were used to predict the displacement of the weld line (upset) with a lambda model to describe the constitutive relation of IN718 at high temperature. The results from the different models are in broad agreement. The shear stress induced by friction at the interface is found to enlarge the upset value; its effect must be taken into account if the upset is to be predicted accurately. The extrusion of the burr during the last second of the welding is a direct result of the quick stop of the rotating part due to the balance of the momentum, which is clearly explained by the analytical mechanical model put forward in this work.

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Chang, Min Carleton University Dissertation Engineering Mechanical. "Damage tolerance of Inconel 718 turbine disc material." Ottawa, 1991.

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Deng, Dunyong. "Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties." Licentiate thesis, Linköpings universitet, Konstruktionsmaterial, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-144491.

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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 λ’/λ’’ 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.

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Cazic, Ivan. "Coaxial laser wire additive manufacturing of Inconel 718." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0113.

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L'utilisation de l'alliage Inconel 718 en fabrication additive a fait l'objet de nombreuses études au cours des dernières années. Il est rapidement apparu que le contrôle de la morphologie et la taille des grains se formant durant la solidification constitue un véritable défi. Notre travail s'attache à le relever dans le cas de la technologie laser-fil coaxial en apportant une meilleure compréhension de la formation des microstructures, notamment des conditions d'apparition de grains équiaxes fins observés en fond de bain de fusion. En premier lieu, la stabilité du procédé ainsi que les aspects thermiques ont été étudiés, en lien avec la solidification. Ainsi, grâce à l'imagerie rapide et l'imagerie thermique, nous avons pu estimer les conditions de solidification en fond de bain. Dans un second temps, nous avons analysé par EBSD les grains équiaxes et révélé qu'ils sont très souvent regroupés en amas multi-maclés présentant une symétrie icosaédrique. Nous proposons que cette organisation particulière est la signature d'un mécanisme «Icosahedral Short Range Order mediated nucleation» (ISRO), qui serait favorisé par les vitesses de refroidissement élevées imposées par le procédé d'une part, et par des enrichissements locaux du liquide en fond de bain lors de la fusion de la couche précédente d'autre part. Nous avons donc caractérisé finement les zones équiaxes par MEB et MET. Nous avons identifié la présence de carbures TiC au sein des amas multi-maclés et nous avons mis en évidence un fort enrichissement local en Nb autour des carbures par EDS. Nous avons pu identifier la phase Nb2Ni à la surface d'un TiC qui requiert une composition locale importante en Nb pour apparaître. À partir de ces observations nous proposons un scenario possible pour l'apparition des grains équiaxes fins dans l'Inconel 718 déposé par la technologie laser-fil coaxial. Les TiC y joueraient un rôle important en capturant les éléments minoritaires lors la refonte, et en promouvant l'apparition locale d'amas icosaédriques dans le liquide qui favoriseraient la germination de grains dont les orientations relatives reflèteraient cet ordre icosaédrique
The use of Inconel 718 alloy in additive manufacturing has been the subject of numerous studies in recent years. It has appeared early that the control of the morphology and size of the grains forming during solidification is a formidable challenge. Our work aims to address this challenge in the case of coaxial laser wire technology by providing a better understanding of the formation of microstructures, including the conditions for the appearance of fine equiaxed grains observed at the bottom of the melt pools.First, the stability of the process as well as the thermal aspects have been investigated, in connection with solidification. Thanks to fast imaging and thermal imaging, we have been able to estimate the solidification conditions at the bottom of the bath.In a second step, we have analyzed by EBSD the equiaxed zones and we have observed that they are very often clustered with twin relations compliant with some icosahedral symmetry. It is proposed that this particular organization is the signature of an "Icosahedral Short Range Order mediated nucleation" (ISRO) mechanism, which would be favored by the high cooling rates imposed by the process on the one hand, and by local enrichments of the liquid at the bottom of the melt pool during the melting of the previous layer on the other hand.We have therefore characterized the equiaxed zones by SEM and TEM. We have identified TiC carbides in the grain clusters and we have highlighted a strong local enrichment in Nb around the carbides by EDS. We have been able to identify Nb2Ni at the surface of a TiC carbide which requires a high local Nb composition to appear.From these observations we propose a possible scenario for the appearance of fine equiaxed grains in Inconel 718 deposited by the coaxial laser wire technology. TiC would play an important role by capturing minority elements during remelting, and by promoting the local appearance of icosahedral clusters in the liquid that would favor the nucleation of grains whose relative orientations would reflect this icosahedral order

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Gustafsson, David. "High temperature fatigue crack propagation behaviour of Inconel 718." Doctoral thesis, Linköpings universitet, Hållfasthetslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-85934.

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The overall objective of this work has been to develop and evaluate tools for designing against fatigue in gas turbine applications, with special focus on the nickel-based superalloy Inconel 718. The fatigue crack propagation behaviour under high temperature hold times has been studied. Firstly, the main fatigue crack propagation phenomena have been investigated with the aim of setting up a basis for fatigue crack propagation modelling. Secondly, modelling of the observed behaviour has been performed. Finally, the constitutive behaviour of the material has been studied, where focus has been placed on trying to describe the mean stress relaxation and initial softening of the material under intermediate temperatures. This thesis is divided into two parts. The first part describes the general framework, including basic observed fatigue crack propagation behaviour of the material when subjected to hold times at high temperature as well as a background for the constitutive modelling of mean stress relaxation. This framework is then used in the second part, which consists of the seven included papers.

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Gustafsson, David. "Constitutive and fatigue crack propagation behaviour of Inconel 718." Licentiate thesis, Linköpings universitet, Hållfasthetslära, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-72610.

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In this licentiate thesis the work done in the TURBO POWER project Influence of high temperature hold times on the fatigue life of nickel-based superalloys will be presented. The overall objective of this project is to develop and evaluate tools for designing against fatigue in gas turbine applications, with special focus on the nickel-based superalloy Inconel 718. Firstly, the constitutive behaviour of the material has been been studied, where focus has been placed on trying to describe the mean stress relaxation and initial softening of the material under intermediate temperatures. Secondly, the fatigue crack propagation behaviour under high temperature hold times has been studied. Focus has here been placed on investigating the main fatigue crack propagation phenomena with the aim of setting up a basis for fatigue crack propagation modelling. This thesis is divided into two parts. The first part describes the general framework, including basic constitutive and fatigue crack propagation behaviour as well as a theoretical background for the constitutive modelling of mean stress relaxation. This framework is then used in the second part, which consists of the four included papers.

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Books on the topic "Inconel 718"

Fox, Stephen Peter. Precipitation reactions in Inconel Alloy 718. Birmingham: University of Birmingham, 1988.

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Sharman, Adrian. An investigation into the high speed machining of Inconel 718. Birmingham: University of Birmingham, 1998.

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International Symposium on Superalloys 718, 625, 706 and Various Derivatives (4th 1997). Superalloys 718, 625, 706 and various derivatives: Proceedings of the International Symposium on Superalloys 718, 625, 706 and Various Derivatives. Warrendale, PA: The Society, 1997.

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A, Johnson Walter, Maurer Gernant A, and United States. National Aeronautics and Space Administration., eds. Effects of tin on microstructure and mechanical behavior of Inconel 718. [Washington, D.C.?]: National Aeronautics and Space Administration, 1985.

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A, Johnson Walter, Maurer Gernant A, and United States. National Aeronautics and Space Administration, eds. Effects of tin on microstructure and mechanical behavior of Inconel 718. [Washington, D.C.?]: National Aeronautics and Space Administration, 1985.

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James, William F. Mechanical properties of inconel 718 and nickel 201 alloys after thermal histories simulating brazing and high temperature service. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1985.

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International Symposium on Superalloys 718, 625, 706 and Various Derivatives (5th 2001). Superalloys 718, 625, 706 and various derivatives: Proceedings of the International Symposium on Superalloys 718, 625, 706 and Various Derivatives : held June 17-20, 2001. Warrendale, Pennsylvania: TMS, 2001.

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International Symposium on Superalloys 718, 625, 706 and Various Derivatives (6th 2005). Superalloys 718, 625, 706 and various derivatives: Proceedings of the Sixth International Symposium on Superalloys 718, 625, 706 and Various Derivatives : held October 2-5, 2005. Warrendale, Pa: TMS, 2005.

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United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., ed. A mechanical property and stress corrosion evaluation of VIM-ESR-VAR work strengthened and direct double aged inconel 718 bar material. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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Book chapters on the topic "Inconel 718"

Klemm, Daniel. "Nickelbasis Legierung Inconel® 718." In Lokale Verformungsevolution von im Elektronenstrahlschmelzverfahren hergestellten IN718-Gitterstrukturen, 57–70. Wiesbaden: Springer Fachmedien Wiesbaden, 2023. http://dx.doi.org/10.1007/978-3-658-42688-0_3.

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Benn, Raymond C., and Randy P. Salva. "Additively Manufactured INCONEL(®) Alloy 718." In Superalloy 718 and Derivatives, 455–69. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495223.ch35.

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Clos, R., H. Lorenz, U. Schreppel, and P. Veit. "Verformungslokalisierung und Spanbildung in Inconel 718." In Hochgeschwindigkeitsspanen metallischer Werkstoffe, 426–45. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527605142.ch19.

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Ressa, Aaron, Timothy Liutkus, Jeremy D. Seidt, and Amos Gilat. "Time Dependent Response of Inconel 718." In Challenges in Mechanics of Time Dependent Materials, Volume 2, 101–4. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-22443-5_12.

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Jasthi, Bharat K., Edward Y. Chen, William J. Arbegast, Matthew Heringer, Douglas R. Bice, and Stanley M. Howard. "Friction Stir Processing of Cast Inconel 718." In Friction Stir Welding and Processing VI, 25–32. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062302.ch4.

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Neidel, Andreas, Lothar Engel, Hermann Klingele, Jörg Völker, Biljana Matijasevic-Lux, Johann Grosch, and Horst Wanzek. "Werkstoff-Nr. 2.4668 (NiCr19NbMo), Markenname Inconel 718." In Handbuch Metallschäden, 722. München, Germany: Carl Hanser Verlag GmbH & Co. KG, 2012. http://dx.doi.org/10.1007/978-3-446-42966-6_37.

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Fu, Shuhong, Jianxin Dong, Maicang Zhang, Ning Wang, and Xishan Xie. "Research on Inconel 718 Type Alloys with Improvement of Temperature Capability." In Superalloy 718 and Derivatives, 281–96. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495223.ch21.

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Hirschmann, A. C. O., M. M. Silva, C. Moura Neto, M. Ueda, C. B. Mello, M. J. R. Barboza, and A. A. Couto. "Surface Modification of Inconel 718 Superalloy by Plasma Immersion Ion Implantation." In Superalloy 718 and Derivatives, 992–1001. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495223.ch75.

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Wang, Zixing, Dianhua Zhou, Qun Deng, Guosheng Chen, and Wei Xie. "The Microstructure and Mechanical Properties of Inconel 718 Fine Grain Ring Forging." In Superalloy 718 and Derivatives, 343–49. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495223.ch26.

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Bor, Hui-Yun, Chao-Nan Wei, Huu Tri Nguyen, An-Chou Yeh, and Chen-Ming Kuo. "Aging Effects on the γ′ and γ″ Precipitates of Inconel 718 Superalloy." In Superalloy 718 and Derivatives, 678–88. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495223.ch52.

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Conference papers on the topic "Inconel 718"

Wong, W., E. Irissou, J. G. Legoux, F. Bernier, P. Vo, S. Yue, S. Michiyoshi, and H. Fukanuma. "Cold Spray Forming Inconel 718." In ITSC 2012, edited by R. S. Lima, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, A. McDonald, and F. L. Toma. ASM International, 2012. http://dx.doi.org/10.31399/asm.cp.itsc2012p0243.

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Abstract In this investigation, Inconel 718, a material known to cause nozzle clogging upon cold spraying, was cold spray formed to 6 mm-thick using the Plasma Giken cold spray system PCS- 1000. This was made possible due to the novel non-clogging nozzle material combined with a nozzle water cooling system. Coatings were as-spray formed using both nitrogen and helium as the propelling gasses. The resulting microstructures as well as the corresponding mechanical properties were studied. In addition, the effect of post-heat treatments was also investigated. It was found that for a given propelling gas used, the coating porosity level remained relatively similar (about 2.4% for nitrogen and 3.6% for helium) regardless of the coating treatment (as-sprayed or heat treated). Visual inspection from SEM micrographs showed a higher fraction of inter-particle metallurgical bonds for nitrogen gas sprayed coatings heat treated at 1250°C for 1 hour due to some sintering effect. This significantly affected its tensile properties with an average resulting ductility of 24.7%.

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Brooks, J. W., and P. J. Bridges. "Metallurgical Stability of Inconel Alloy 718." In Superalloys. TMS, 1988. http://dx.doi.org/10.7449/1988/superalloys_1988_33_42.

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Chen, Q., N. Kawagoishi, K. Othubo, E. Kondo, M. Sakai, and T. Kizaki. "Ultrasonic Fatigue Strength in Inconel 718." In Superalloys. TMS, 2001. http://dx.doi.org/10.7449/2001/superalloys_2001_573_582.

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Benn, R., and R. Salva. "Additively Manufactured INCONEL® Alloy 718." In Superalloys. John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.7449/2010/superalloys_2010_455_469.

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Shin, Yung C., and Jin-Nam Kim. "Plasma Enhanced Machining of Inconel 718." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0791.

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Abstract The experimental analysis of plasma enhanced machining (PEM) of Inconel 718 is presented in this paper. Surface temperatures due to plasma heating are systematically characterized through experimental investigation using infrared radiation thermometry and an empirical model is developed to predict the workpiece surface temperature in terms of various operating conditions. Benefits of PEM are also illustrated through a reduction of cutting forces and improved surface roughness over a wide range of cutting conditions. In addition, improvement of productivity in machining Inconel 718 with PEM is demonstrated.

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Sainte-Catherine, C., and M. Jeandin. "Laser Cladding of Astroloy on Inconel 718." In Superalloys. TMS, 1989. http://dx.doi.org/10.7449/1989/superalloys_1989_479_488.

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Lewandowski, M. S., V. Sahai, R. C. Wilcox, C. A. Matlock, and R. A. Overfelt. "High Temperature Deformation of INCONEL 718 Castings." In Superalloys. TMS, 1994. http://dx.doi.org/10.7449/1994/superalloys_1994_345_354.

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Cobb, Gregory R., Adam D. Nesmith, Andrew J. Lingenfelter, and Ryan P. O'Hara. "Vibrational Properties of Additively Manufactured Inconel 718." In 2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-0489.

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ZYSK, KEVIN. "Pulsed CO2 laser welding of Inconel 718." In 26th Joint Propulsion Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1990. http://dx.doi.org/10.2514/6.1990-2514.

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Stewart, William R., and Thomas E. Dyson. "Conjugate Heat Transfer Scaling for Inconel 718." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64873.

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Over the last decade, conjugate heat transfer testing has been shown to be important because it replicates the sum of the hot gas path heat transfer coefficient, film cooling, film cooling heat transfer augmentation, bore cooling, conduction through the wall, internal cooling heat transfer coefficients, and the relative amounts of heat pick up in the cooling flow. Instead of measuring these boundary conditions in individual experiments, conjugate heat transfer testing measures the cumulative effect as well as each boundary condition’s effect on the others. Typically, matched Biot number heat transfer experiments are performed at near room temperature with a surrogate material; however, this study examines how the thermal conductivity of a nickel alloy sufficiently changes between room temperature and temperatures representative of turbine engines to allow matched Bi heat transfer tests using nickel at laboratory conditions. The ratio of the thermal conductivity of air to the thermal conductivity of Inconel 718 stays mostly constant between engine representative temperatures and room temperature. Over this range, the thermal conductivity of both air and Inconel 718 change ∼2.5X, and the change in thermal conductivity allows for conjugate heat transfer tests to match Reynolds number, Nusselt number, film effectiveness, Biot number, and Stanton number. Experimental results at two temperature conditions are shown confirming the theory. Finally, a method for scaling the thermal impact of dust accumulation at laboratory conditions to turbine conditions is proposed.

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Reports on the topic "Inconel 718"

Chaudhury, Prabir K., and Dan Zhao. Atlas of Formability: INCONEL 718. Fort Belvoir, VA: Defense Technical Information Center, July 1992. http://dx.doi.org/10.21236/ada268350.

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Strons, P. S., J. L. Bailey, J. Song, and S. D. Chemerisov. Analysis of the NorthStar Inconel 718 Window. Office of Scientific and Technical Information (OSTI), September 2019. http://dx.doi.org/10.2172/1576467.

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Fietek, Carter, and Edmundo Corona. Power Law Hardening Fit for Inconel 718 Material. Office of Scientific and Technical Information (OSTI), April 2021. http://dx.doi.org/10.2172/1774745.

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Saleh, Tarik A., Hong Bach, Stuart A. Maloy, Tobias J. Romero, and Osman Anderoglu. Mechanical Properties of an Irradiated Inconel 718 Beam Window. Office of Scientific and Technical Information (OSTI), November 2012. http://dx.doi.org/10.2172/1054667.

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Taller, Stephen, Annabelle Le Coq, Caleb Massey, Jesse Werden, Matthew Lynch, Matthew Lynch, and Kory Linton. Report on Evolution of Inconel 718 Following HFIR Irradiation. Office of Scientific and Technical Information (OSTI), October 2022. http://dx.doi.org/10.2172/1963154.

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Weerasooriya, T., and T. Nicholas. Overload Effects in Sustained Load Crack Growth in Inconel 718. Fort Belvoir, VA: Defense Technical Information Center, November 1985. http://dx.doi.org/10.21236/ada162739.

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GREENE, G. A., and C. C. FINFROCK. OXIDATION OF INCONEL 718 IN AIR AT TEMPERATURES FROM 973K TO 1620K. Office of Scientific and Technical Information (OSTI), October 2000. http://dx.doi.org/10.2172/777719.

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GREENE, G. A. DEPENDENCE OF TOTAL HEMISPHERICAL EMISSIVITY OF INCONEL-718 ON SURFACE OXIDATION AND TEMPERATURE. Office of Scientific and Technical Information (OSTI), September 1999. http://dx.doi.org/10.2172/750781.

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Moddeman, W., W. Jones, T. Koeller, S. Craven, and D. Kramer. Chemistry of glass-ceramic to metal bonding for header applications: III. Treatment of Inconel 718 to eliminate hot cracking during laser welding. Office of Scientific and Technical Information (OSTI), April 1987. http://dx.doi.org/10.2172/6454838.

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Lillard, R. S., D. L. Pile, and D. P. Butt. Materials corrosion and mitigation strategies for APT, end of FY `97 report: Inconel 718 in-beam corrosion rates from the `97 A6 irradiation. Office of Scientific and Technical Information (OSTI), August 1998. http://dx.doi.org/10.2172/656710.

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