Artykuły w czasopismach: „Inconel 718”

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Zheng, Jin, Yaoman Zhang i Hanying Qiao. "Milling Mechanism and Chattering Stability of Nickel-Based Superalloy Inconel 718". Materials 16, nr 17 (22.08.2023): 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 i 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 i Da Wei Yao. "The Addition of Zr in Nickel-Based Inconel 718 Superalloy to Prevent Hot Cracks Propagation". Key Engineering Materials 727 (styczeń 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 i Dong-Hyuk Kim. "Investigating Oxide Formation and Growth in Inconel 718 Oxidized at High Temperatures". Journal of Nanoelectronics and Optoelectronics 19, nr 10 (1.10.2024): 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 i Chun Yan Zhang. "The Cutting Simulation of Inconel 718". Applied Mechanics and Materials 43 (grudzień 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 i Sehijpal Singh Khangura. "Technological Innovations in Machining of Inconel 718". International Journal of Manufacturing, Materials, and Mechanical Engineering 5, nr 2 (kwiecień 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 i Jin Jun Lu. "Friction and Wear of Ti₃SiC₂-Ag/Inconel 718 Tribo-Pair under a Hemisphere-on-Disk Contact". Key Engineering Materials 602-603 (marzec 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 i 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, nr 3 (1.03.2023): 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 i 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, nr 2 (17.02.2023): 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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Yang, L. F., i H. M. Wen. "Determination and verification of parameters in the dynamic constitutive for Inconel 718 superalloy". Journal of Physics: Conference Series 2891, nr 4 (1.12.2024): 042019. https://doi.org/10.1088/1742-6596/2891/4/042019.

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Abstract Inconel 718, which is a nickel-based superalloy material used in aero engines, may be subjected to intense dynamic loading in an accidental engine failure. However, the material models for Inconel 718 employed in existing studies can not describe the mechanical behaviors under complex stress states, high strain rates and elevated temperatures satisfactorily. In this paper, various parameters of a previously proposed dynamic constitutive model for Inconel 718 are determined and verified. First, the parameters of strength, strain rate effect, temperature effect and failure for precipitation hardened Inconel 718 are calibrated against various material tests. Then, the parameters are verified by comparing the numerical results obtained from the dynamic constitutive model with the corresponding ballistic test data. It transpires that the numerical results agree well with the test data, which demonstrates the accuracy and effectiveness of the dynamic constitutive model for Inconel 718. It can also be concluded that the consideration of Lode angle effect and precise descriptions of strain rate and temperature effects are significant for the reproduction of mechanical responses of Inconel 718 plates under intense dynamic loadings in numerical simulations.

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Yin, Qingan, Hui Chen, Jianxiong Chen, Yu Xie, Ming Shen i Yuhua Huang. "Microstructure-Based Flow Stress Model to Predict Machinability of Inconel 718". Materials 17, nr 17 (25.08.2024): 4206. http://dx.doi.org/10.3390/ma17174206.

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Due to its exceptional mechanical and chemical properties at high temperatures, Inconel 718 is extensively utilized in industries such as aerospace, aviation, and marine. Investigating the flow behavior of Inconel 718 under high strain rates and high temperatures is vital for comprehending the dynamic characteristics of the material in manufacturing processes. This paper introduces a physics-based constitutive model that accounts for dislocation motion and its density evolution, capable of simulating the plastic behavior of Inconel 718 during large strain deformations caused by machining processes. Utilizing a microstructure-based flow stress model, the machinability of Inconel 718 in terms of cutting forces and temperatures is quantitatively predicted and compared with results from orthogonal cutting experiments. The model’s predictive precision, with a margin of error between 5 and 8%, ensures reliable consistency and enhances our comprehension of the high-speed machining dynamics of Inconel 718 components.

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Dong, Hong Bo, Yong Wang i Li Wang. "Superplasticity of Inconel 718 Alloy by Strain-Reduced Superplasticity Deformation Process". Applied Mechanics and Materials 446-447 (listopad 2013): 344–47. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.344.

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The high temperature tensile experiments were carried out to investigate the superplasticity of Inconel 718 alloy by using the strain-reduced superplasticity deformation process based maximum m value method. The results indicate the fine and homogeneous grain structure of Inconel 718 alloy is obtained by hot forging, δ phase precipitation and recrystallization heat treatment process. The Inconel 718 alloy exhibits good superplasticity at a wide range of temperature from 950°C to 1020°C, and the best elongation of 566% appears at 950°C. It shows the excellent superplasticity of Inconel 718 alloy can be obtained with the strain-reduced superplasticity deformation process based maximum m value method.

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Lu, Xiaohong, FuRui Wang, Zhenyuan Jia, Likun Si i Yongqiang Weng. "Influence of feed per tooth on tool wear based on 3D finite element simulation in micro-milling of Inconel 718". Industrial Lubrication and Tribology 69, nr 4 (10.07.2017): 585–90. http://dx.doi.org/10.1108/ilt-05-2016-0119.

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Purpose This paper aims to predict tool wear and reveal the relationship between feed per tooth and tool wear in micro-milling Inconel 718 process. Design/methodology/approach To study and solve the tool wear problem in micro-milling of Inconel 718 micro components, in this paper, the investigation of micro-milling Inconel 718 process was implemented based on DEFORM finite element simulation, and tool wear depth of micro-milling cutter acted as output. Findings Different from the traditional macro milling process, diameter reduction percentage and average flank wear length decreased with the increase of feed per tooth; tool wear depth decreased when the feed per tooth was less than the minimum chip thickness. Originality/value At present, research on the prediction of tool wear in micro-milling of Inconel 718 has never been publicly reported. This study is significant to reveal the relationship between cutting parameters (feed per tooth) and tool wear in micro-milling Inconel 718.

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Yevdokymov, Oleksandr, Vitalii Kolesnyk, Jozef Peterka, Tomas Vopat, Munish Kumar Gupta, Dmytro Lisovenko i Andrii Dovhopolov. "Pareto Analysis of Machining Factors Significance When Turning of Nickel-Based Superalloy Inconel 718". Metals 13, nr 8 (27.07.2023): 1354. http://dx.doi.org/10.3390/met13081354.

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Nickel superalloys occupy a reasonably broad niche in the industry. One of this group’s most common and well-known alloys is Inconel 718. Parts from Inconel 718 are used in aerospace, energy, automotive, and some other vital industries, which creates a demand for research and improvement of the machining conditions of this alloy. This article is devoted to the systematization and generalization of the accumulated experience of machining of Inconel 718 at turning operation. The research methodology is based on the Pareto distribution. In the study, more than 50 articles devoted to turning Inconel 718 were analyzed. The tool materials, methods, and types of coating used in turning Inconel 718 were analyzed. Finite element method modeling of processing processes has been considered. The trends in the selection of cutting parameters and the geometry of the cutting tool and finite element method modeling of processing processes have been considered. Lacunae for promising future research were formulated.

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Zimmerman, Craig. "Boronizing Additively Manufactured Inconel 718". AM&P Technical Articles 174, nr 8 (1.09.2016): 46–47. http://dx.doi.org/10.31399/asm.amp.2016-08.p046.

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Mannan Basha, S., B. C. Raghu kumar Reddy i T. Vishnu Vardhan. "Optimization of Cutting Parameters in High Speed Turning of Nickel Alloy". Asian Journal of Science and Applied Technology 2, nr 2 (5.11.2013): 5–13. http://dx.doi.org/10.51983/ajsat-2013.2.2.762.

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Inconel 718 is one of the important alloys among all the Nickel and Nickel based alloy Inconel 718 has found its niche in many industries, owing to its unique properties. Inconel 718 material is widely used in as aircraft engine parts, steam turbine power plants, space vehicles, But due to peculiar characteristics such as lower thermal conductivity, work hardening, presence of abrasive carbide particles it difficult to machine, Cost effective machining with generation of good surface finish on the Inconel 718 components during turning operation is a challenge to the manufacturing engineers in practice. Considering all the above facts the present work aims to study the influence of different cutting parameters like cutting speed, feed rate and depth of cut of super alloy Inconel 718 and AISI 52100 Steel during high speed turning. Test results were analyzed to determine the better parameters for optimal cutting during high speed machining of Inconel 718 cubic boron nitride tool. A parametric model of cutting tool and work piece is designed using 3D modelling software Pro/Engineer. Analytical investigations are to be made on the model by applying the forces by taking different values of cutting speed, feed rate and depth of cut. Analysis is done in Ansys.

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Zhang, Haijun, Fei Chen, Zengqiang Li, Wangjie Hu, Tao Sun i Junjie Zhang. "Investigation of Laser-Assisted Micro-Milling Process of Inconel 718". Journal of Manufacturing and Materials Processing 7, nr 4 (10.08.2023): 149. http://dx.doi.org/10.3390/jmmp7040149.

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While Inconel 718 is a widely used engineering material in industrial fields such as the aerospace and automotive fields, the machined surface integrity has a significant effect on the performance of its components and parts. In this work, the laser-assisted micro-milling process of Inconel 718 is investigated using a combination of experiments and finite element simulations. Firstly, an experimental platform of laser-assisted milling is built, and a three-dimensional thermal–mechanical coupled finite element model of laser-assisted milling of Inconel 718 is then established. Secondly, laser-assisted milling experiments and finite element simulations are conducted to investigate the impact of laser assistance on cutting force, chip morphology, tool wear and surface topography of Inconel 718 under a milling process. The results indicate that laser-assisted milling results in a moderate reduction in cutting forces while enhancing surface integrity and chip continuity, as compared with ordinary milling. Thirdly, orthogonal experiments of laser-assisted milling of Inconel 718 are conducted to discover the optimal processing parameters, including spindle speed, feed per tooth, milling depth and laser parameters. Finally, single-factor experiments are conducted to investigate the effect of laser power on cutting force, chip morphology, tool wear, groove burr and surface roughness in the laser-assisted milling of Inconel 718. And, a minimal surface roughness Sa of 137 nm for Inconel 718 accompanied by minimal tool wear is experimentally obtained via laser-assisted milling. These findings highlight the effectiveness of applying laser assistance in enhancing the machinability of difficult-to-machine materials for achieving desirable machined surface integrity.

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Rehman, Ateekh Ur, Nagumothu Kishore Babu, Mahesh Kumar Talari, Saqib Anwar, Yusuf Usmani i Ali M. Al-Samhan. "Dissimilar Rotary Friction Welding of Inconel 718 to F22 Using Inconel 625 Interlayer". Applied Sciences 11, nr 22 (12.11.2021): 10684. http://dx.doi.org/10.3390/app112210684.

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Dissimilar metal joining has always been a challenging task because of the metallurgical incompatibility and difference in melting points of alloys being joined. Diffusion and mixing of alloying elements from dissimilar base metals at the weld often cause unwanted metallurgical changes resulting in unsuccessful welds or underperformance of the weldment. Solid-state dissimilar friction welds of Inconel 718 and F22 were prepared in this study with an Inconel 625 interlayer to address the carbon enrichment of Inconel 718 during the welding. Defect-free rotary friction welds were produced in this study. Microstructural and mechanical properties investigation of the weldments and base metals was carried out, and results were analysed. Intermixing zone was observed at the weld interface due to the softening of the metal at the interface and rotatory motion during the welding. The high temperatures and the plastic deformation of the intermixing zone and thermo-mechanically affected zone (TMAZ) resulted in the grain refinement of the weld region. The highest hardness was observed at the Inconel 718/F22 weld interface due to the plastic strain and the carbon diffusion. The tensile specimens failed in the F22 base metal for the weld prepared with and without the Inconel 625 interlayer. Inconel 718/F22 welds exhibited lower toughness values compared to the Inconel 718/F22 welds prepared with Inconel 625 interlayer.

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Wu, Kaiqiang, Sin Wei Chee, Wen Sun, Adrian Wei-Yee Tan, Sung Chyn Tan, Erjia Liu i Wei Zhou. "Inconel 713C Coating by Cold Spray for Surface Enhancement of Inconel 718". Metals 11, nr 12 (17.12.2021): 2048. http://dx.doi.org/10.3390/met11122048.

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Inconel 713C is a nickel-based superalloy usually considered as a material of poor weldability due to its susceptibility to hot cracking in the heat-affected zones. Cold spray, a solid-state deposition technology that does not involve melting, can be proposed as a methodology to deposit Inconel 713C for surface enhancement of other target components. In this study, Inconel 713C coating was deposited on Inconel 718 substrate with a high-pressure cold spray system. The coating was characterized in terms of microstructure, hardness, and wear properties. The cold-sprayed Inconel 713C coating has a low porosity level and refined grain structures. Microhardness of the Inconel 713C coating was much higher than the Inconel 718 substrate. The sliding wear tests showed that the wear resistance of the cold-sprayed Inconel 713C coating is three times higher than the Inconel 718 substrate, making the coating a suitable protective layer. The main wear mechanisms of the coating include oxidation, tribo-film formation, and adhesive wear.

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Yuvaraja Naik, Vinod Kumar, Udaya Ravi M. ,. "Comparative Studies on Mechanical Properties and Corrosion Rate of Nickel Chromium Carbide (Cr3C2-NiCr) Coated on Inconel 600, 625, 718 Specimen". Tuijin Jishu/Journal of Propulsion Technology 44, nr 4 (16.10.2023): 855–70. http://dx.doi.org/10.52783/tjjpt.v44.i4.942.

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In this present work, Nickel Chromium Carbide (Cr3C2-NiCr) coated on three different Inconel 600, 625, 718 Specimen are used and the mechanical properties, corrosion resistance and morphological properties of the specimen were investigated by conducting Brinell hardness test, Vickers Hardness Test, Tensile test and electrochemical test experiments respectively and found that Inconel 625 has maximum hardness, maximum tensile strength and less corrosion resistance as compared to the remaining two coated Inconel specimen 600 & 718. And then coated surfaces of Inconel 600, 625 and 718 specimens were analyzed by using Scanning Electron Microscope (SEM), XRD, EDAX and optical microstructure techniques.

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Kiswanto, Gandjar, Maulana Azmi, Adrian Mandala, Dede Lia Zariatin i Tae Jo Ko. "Machining Parameters Mapping’s of Inconel 718 and Aluminum Alloy 1100 in Micro-Milling Process". Key Engineering Materials 846 (czerwiec 2020): 99–104. http://dx.doi.org/10.4028/www.scientific.net/kem.846.99.

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The development of micro-products in industry, like aviation, medical equipment, electronics, etc, has been increasing lately. The need for scaling down of product has been increasing to make the product simpler and complex. Micro-milling has capabilities in producing complex parts. In this study, mapping and comparing the result of the machining process of Inconel 718 and Aluminum Alloy 1100 was employed. In this experiment, Inconel 718 was used as workpiece material and the result of Aluminum Alloy taken from recent studies. Then, A cutting tool with a diameter 1 mm carbide coating TiAlN was used in this experiment. The machining process was performed with three varieties of spindle speed and feed rate with a constant depth of cut. After the machining is done, the mapping of the result surface roughness of Inconel 718 and AA1100 performed. It was found that Inconel 718 has poor machinability compared with AA 1100. Inconel 718 also has a high manufacturing cost compared to AA 1100 because the cutting tool was easy to wear.

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Lu, Xiaohong, FuRui Wang, Liang Xue, Yixuan Feng i Steven Y. Liang. "Investigation of material removal rate and surface roughness using multi-objective optimization for micro-milling of inconel 718". Industrial Lubrication and Tribology 71, nr 6 (12.08.2019): 787–94. http://dx.doi.org/10.1108/ilt-07-2018-0259.

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Purpose The purpose of this study is to realize the multi-objective optimization for MRR and surface roughness in micro-milling of Inconel 718. Design/methodology/approach Taguchi method has been applied to conduct experiments, and the cutting parameters are spindle speed, feed per tooth and depth of cut. The first-order models used to predict surface roughness and MRR for micro-milling of Inconel 718 have been developed by regression analysis. Genetic algorithm has been utilized to implement multi-objective optimization between surface roughness and MRR for micro-milling of Inconel 718. Findings This paper implemented the multi-objective optimization between surface roughness and MRR for micro-milling of Inconel 718. And some conclusions can be summarized. Depth of cut is the major cutting parameter influencing surface roughness. Feed per tooth is the major cutting parameter influencing MRR. A number of cutting parameters have been obtained along with the set of pareto optimal solu-tions of MRR and surface roughness in micro-milling of Inconel 718. Originality/value There are a lot of cutting parameters affecting surface roughness and MRR in micro-milling, such as tool diameter, depth of cut, feed per tooth, spindle speed and workpiece material, etc. However, to the best our knowledge, there are no published literatures about the multi-objective optimization of surface roughness and MRR in micro-milling of Inconel 718.

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Yao, Jun, Bo Xin, Yadong Gong i Guang Cheng. "Effect of Initial Temperature on the Microstructure and Properties of Stellite-6/Inconel 718 Functional Gradient Materials Formed by Laser Metal Deposition". Materials 14, nr 13 (28.06.2021): 3609. http://dx.doi.org/10.3390/ma14133609.

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Stelite-6/Inconel 718 functionally gradient materials (FGM) is a heat-resisting functional gradient material with excellent strength performance under ultra-high temperatures (650–1100 °C) and, thus, has potential application in aeronautic and aerospace engineering such as engine turbine blade. To investigate the effect of initial temperature on the microstructure and properties of laser metal deposition (LMD) functional gradient material (FGM), this paper uses the LMD technique to form Stelite-6/Inconel 718 FGM at two different initial temperatures: room temperature and preheating (300 °C). Analysis of the internal residual stress distribution, elemental distribution, microstructure, tensile properties, and microhardness of 100% Stelite-6 to 100% Inconel 718 FGM formed at different initial temperatures in a 10% gradient. The experimental results prove that the high initial temperature effectively improves the uneven distribution of internal residual stresses. Preheating slows down the solidification time of the melt pool and facilitates the escape of gases and the homogeneous diffusion of elements in the melt pool. In addition, preheating reduces the bonding area between the gradient layers, enhancing the metallurgical bonding properties between the layers and improving the tensile properties. Compared with Stellite-6/Inconel 718 FGM formed at room temperature, the mean yield strength, mean tensile strength, and mean elongation of Stellite-6/Inconel 718 FGM formed at 300 °C are increased by 65.1 Mpa, 97 MPa, and 5.2%. However, the high initial temperature will affect the hardness of the material. The average hardness of Stellite-6/Inconel 718 FGM formed at 300 °C is 26.9 HV (Vickers hardness) lower than that of Stellite-6/Inconel 718 FGM formed at 20 °C.

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Siddaiah, Arpith, Ashish Kasar, Pankaj Kumar, Javed Akram, Manoranjan Misra i Pradeep L. Menezes. "Tribocorrosion Behavior of Inconel 718 Fabricated by Laser Powder Bed Fusion-Based Additive Manufacturing". Coatings 11, nr 2 (8.02.2021): 195. http://dx.doi.org/10.3390/coatings11020195.

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Additive manufacturing (AM) by laser powder bed fusion (LPBF) has gained significant research attention to fabricate complex 3D Inconel alloy components for jet engines. The strategic advantages of LPBF-based AM to fabricate jet components for aerospace applications are well reported. The jet components are exposed to a high degree of vibration during the jet operation in a variable aqueous environment. The combined vibration and the aqueous environment create a tribological condition that can accelerate the failure mechanism. Therefore, it is critical to understand the tribocorrosion behavior of the Inconel alloy. In the present work, tribocorrosion behavior of the LPBF fabricated standalone coating of Inconel 718 in the 3.5% NaCl aqueous solution is presented. The LPBF fabricated samples are analyzed to determine the impact of porosity, generated as a result of LPBF, on the triobocorrosion behavior of AM Inconel 718. The study includes potentiodynamic tests, cathodic polarization, along with OCP measurements. The corrosive environment is found to increase the wear by 29.24% and 49.5% without the initiation of corrosion in the case of AM and wrought Inconel 718, respectively. A corrosion accelerated wear form of tribocorrosion is observed for Inconel 718. Additionally, the corrosive environment has a significant effect on wear even when the Inconel 718 surface is in equilibrium potential with the corrosive environment and no corrosion potential scan is applied. This study provides an insight into a critical aspect of the AM Inconel components.

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Doleker, Kadir Mert, Okan Odabas, Yasin Ozgurluk, Hangardas Askerov i Abdullah Cahit Karaoglanli. "Effect of high temperature oxidation on Inconel 718 and Inconel 718/YSZ/Gd2Zr2O7". Materials Research Express 6, nr 8 (12.06.2019): 086456. http://dx.doi.org/10.1088/2053-1591/ab26d8.

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Ben Slama, M., S. Chatti i L. Kolsi. "Comparative Analysis of Melt Pool Evolution in Selective Laser Melting of Inconel 625 and Inconel 718 Nickel-Based Superalloys". Annals of Dunarea de Jos University of Galati. Fascicle XII, Welding Equipment and Technology 34 (30.12.2023): 119–24. http://dx.doi.org/10.35219/awet.2023.10.

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One of the key advantages of Additive Manufacturing is the versatility in working with a wide range of materials. Among these materials, Nickel-based superalloys have drawn great attention of specialists. This study investigates the behavior of Inconel 625 and Inconel 718 during selective laser melting. While these alloys have many similarities, thus their distinct chemical compositions determine different responses to this new process, which the authors aimed to elucidate in this study. Numerical simulations using ANSYS Additive® software were conducted to compare the melt pool dimensions (depth and width) of Inconel 625 and Inconel 718. The results reveal that the material's thermal properties play a significant role in determining the melt pool geometry. The Inconel 718 consistently exhibited larger melt pool dimensions than Inconel 625. The findings highlight the importance of understanding the connection between the material properties and process parameters.

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Mrkvica, Ivan, i Miroslav Janoš. "Comparison of Round Insert's Lifetime when Milling Inconel 718". Key Engineering Materials 581 (październik 2013): 26–31. http://dx.doi.org/10.4028/www.scientific.net/kem.581.26.

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This article focuses on the analysis of tool wear mechanisms in milling of Inconel 718. Inconel 718 is tough and highly temperature resistive material, which is used due to its excellent properties especially in aggressive corrosive medium. Machining of this alloy is still complicated. The feasibility of four inserts tested for milling of Inconel 718 has been shown in the work. Different cutting speeds and feeds were used. Experimental tests were performed in order to analyze wear patterns evolution. It was found influence of cutting conditions and type if insert in tool wear mode.

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Sugihara, Tatsuya, Shota Takemura i Toshiyuki Enomoto. "Improving Tool Wear Resistance in Inconel 718 Cutting by Considering Surface Microstructures of CBN Cutting Tool". Advanced Materials Research 1136 (styczeń 2016): 561–66. http://dx.doi.org/10.4028/www.scientific.net/amr.1136.561.

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Nickel-based superalloys such as Inconel 718 are known as one of the most difficult-to-cut materials due to their mechanical and chemical properties and the tool life is extremely short. Recently, Cubic-Boron-Nitride (CBN) has received a considerable attention as a material for cutting tools and has been considered to be a major candidate for high performance cutting of Inconel 718. However, the detailed wear behavior of CBN tools in cutting of Inconel 718 is not sufficiently understood yet, and the performances of CBN tools are still insufficient in practical use. To overcome this problem, we first conducted orthogonal cutting experiments on Inconel 718 at low (20 m/min) and high (100 m/min) cutting speeds employing CBN cutting tools to clarify the detailed wear mechanisms. Moreover, relationship between surface microstructures of the cutting tool and wear resistance was investigated. As a result, it was found that a rake face with micro grooves significantly suppressed the crater wear at low cutting speed, although polished surface rake face reduced the initial crater wear by approximately 40 % compared to the non-polished tool in high speed cutting of Inconel 718.

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Zhang, Hang, Guosheng Su, Yan Xia, Peirong Zhang, Binxun Li, Yujing Sun, Jin Du i Bin Fang. "Cutting Performance of a Longitudinal and Torsional Ultrasonic Vibration Tool in Milling of Inconel 718". Coatings 14, nr 6 (5.06.2024): 719. http://dx.doi.org/10.3390/coatings14060719.

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Inconel 718 has excellent thermal and chemical properties and is widely used in the manufacture of aerospace parts; however, there are some problems in the machining of Inconel 718, such as a large milling force, serious tool wear, and poor surface quality. In this research, a type of longitudinal–torsional ultrasonic milling (LTUM) tool is designed based on theoretical computations and FEM simulation analysis. To verify the design rationality of the developed LTUM tool, milling experiments are performed. It is verified that the LTUM tool can realize an elliptical vibration path at the tool tip. The resonance frequency of the tool is 21.32 kHz, the longitudinal amplitude is 6.8 µm, and the torsional amplitude is 1.4 µm. In the milling of Inconel 718, the experimental data of LTUM are compared with those of conventional milling (CM). The comparative experiments show that the LTUM tool can effectively lessen the milling force and tool wear in the milling of Inconel 718, improve the surface quality, inhibit the generation of burrs, and improve the chip breaking ability. The application potential of the LTUM tool in high-performance milling of Inconel 718 parts is proven.

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Rautio, Timo, Jarmo Mäkikangas, Jani Kumpula, Antti Järvenpää i Atef Hamada. "Laser Welding of Laser Powder Bed Fusion Manufactured Inconel 718: Microstructure and Mechanical Properties". Key Engineering Materials 883 (kwiecień 2021): 234–41. http://dx.doi.org/10.4028/www.scientific.net/kem.883.234.

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This paper focuses on the laser weldability of additively manufactured (AM) Inconel 718. The experiments of this research were conducted on different series of AM Inconel 718 alloy, i.e. as-built, heat treated (HT), and HT after welding, and comprehensively characterized using optical microscope and electron back scattering diffraction (EBSD). The weld morphology and microstructural evolution of the fusion zone were recorded. The mechanical properties of the welded AM Inconel 718 were evaluated by tensile tests and hardness measurements. It was found that solidification crack and micropore defects are induced in the asbuilt AM Inconel 718. However, defectfree weld was promoted in the HT alloy. The changes in hardness profiles and tensile strength under the experimental parameters were further reported. Homogenous hardness of 500 HV across the weld was obtained when HT was applied after the LW.

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Ohlert, M., M. Lachenmaier, D. Trauth i T. Bergs. "Außenrundschleifen von Inconel 718*/External cylindrical grinding of Inconel 718 – Comparison of electroplated CBN and diamond grinding wheels cooled with water-based solution". wt Werkstattstechnik online 109, nr 06 (2019): 468–72. http://dx.doi.org/10.37544/1436-4980-2019-06-70.

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Zur schleiftechnischen Bearbeitung schwer zerspanbarer Werkstoffe wie Inconel 718 werden in der Industrie überwiegend CBN (kubisch kristallines Bornitrid)-Schleifscheiben verwendet. In der Regel kommt dabei Öl als Kühlschmierstoff zum Einsatz, was jedoch für viele Anwender nicht immer möglich ist. Ziel der Untersuchungen war daher der Vergleich zwischen galvanisch gebundener CBN- und Diamant-Schleifscheibe hinsichtlich Verschleiß und Zerspanleistung beim Außenrundschleifen von Inconel 718 unter Kühlung mit einer wasserbasierten Lösung.   CBN grinding wheels are mainly used in industry to grind materials that are difficult to machine, such as Inconel 718. Usuially oil is used as a cooling lubricant, but this is not always possible for many users. Therefore, the aim of the investigation was to compare electroplated CBN and diamond grinding wheels regarding wear and cutting performance during external cylindrical grinding of Inconel 718 while being cooled with a water-based solution.

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Xie, Xi Shan, Jian Xin Dong, Mai Cang Zhang i Shu Hong Fu. "High Temperature Structure Stability Study on Nb-Containing Nickel-Base Superalloys". Materials Science Forum 546-549 (maj 2007): 1281–88. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1281.

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High temperature structure stability of 2 important Nb-containing Ni-base superalloys Inconel 718 (Ni-19Cr-18Fe-3Mo-5Nb-1Ti-0.5Al) and Inconel 740 (Ni-25Cr-20Co-0.5Mo-2Nb -1.8Ti-0.8Al) have been studied on the relationship of microstructure to mechanical properties via SEM, TEM, SAD, XRD and quantitative determination of precipitated phases by micro-chemical analysis. The longest exposure times are 50,000hrs at 650°C for Alloy 718 and 4,000hrs at 704°C, 725°C and 760°C for Alloy 740. The structure instabilities for these 2 Alloys are: 1) strengthening phases γ″/γ′ coarsening; 2) meta-stable strengthening phases change to stable phase, such as γ″→ δ-Ni3Nb for Alloy 718 and γ′→ η-Ni3Ti for Alloy 740; 3) embrittling phases formation, such as α-Cr and σ-phase formation in Alloy 718 and high Si-containing G-phase formation in Alloy 740. On the base of understanding phase changes at high temperature exposures the structure stability of Inconel 718 and Inconel 740 has been improved both by minor adjustment of alloys chemistry. The modifications of Alloy 718 and Alloy 740 are to be developed in the near future.

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Nurul Amin, A. K. M., A. Fakhruzi Majed, M. K. Daud, Anayet Ullah Patwari i M. H. Ishtiyaq. "Investigation of the Machinability of Inconel 718 in Room Temperature and Preheated Conditions". Advanced Materials Research 264-265 (czerwiec 2011): 1187–92. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.1187.

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Inconel 718 is widely used in the aviation, space, navigation and shipping industries because of its outstanding properties. The very mechanical characteristics that give this alloy the highly valued properties also make it one of the most difficult-to-machine aerospace materials. Due to the hardness of nickel-based super-alloys, such as Inconel 718, advanced tools like ceramics have been recommended to machine them. But ceramics are low conductive materials, and the heat generated during the machining of Inconel 718 transfers very slowly through them. The accumulation of generated heat on the cutting edges of ceramic tools causes many problems and sometime leads to premature tool failure. Hence in this study the effectiveness of PVD TiAlN coated carbide insert has been investigated. One approach to overcome the difficulties in machining of Inconel 718 is to use an external heat source to soften the work material surface layer to be removed in order to decrease its tensile strength. A new approach of preheating using inducting heating as an economical alternative to Laser Assisted Machining for end milling of Inconel 718 is presented in this paper. The machinability of Inconel 718 under varying conditions is evaluated by examining tool wear, surface roughness and chip morphology. With increasing work-piece preheating temperature, from room temperature to 420 °C, the advantages of Induction heating is demonstrated by an extended tool life and better surface finish due to more stable chip formation and elimination of micro and macro failure of the tool.

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Hu, Longfei, Ketian Shi, Xiaoguang Luo, Jijun Yu, Bangcheng Ai i Chao Liu. "Application of Additively Manufactured Pentamode Metamaterials in Sodium/Inconel 718 Heat Pipes". Materials 14, nr 11 (2.06.2021): 3016. http://dx.doi.org/10.3390/ma14113016.

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In this study, pentamode metamaterials were proposed for thermal stress accommodation of alkali metal heat pipes. Sodium/Inconel 718 heat pipes with and without pentamode metamaterial reinforcement were designed and fabricated. Then, these heat pipes were characterized by startup tests and thermal response simulations. It was found that pentamode metamaterial reinforcement did not affect the startup properties of sodium/Inconel 718 heat pipes. At 650–950 °C heating, there was a successful startup of heat pipes with and without pentamode metamaterial reinforcement, displaying uniform temperature distributions. A further simulation indicated that pentamode metamaterials could accommodate thermal stresses in sodium/Inconel 718 heat pipes. With pentamode metamaterial reinforcement, stresses in the heat pipes decreased from 12.9–62.1 to 10.2–52.4 MPa. As a result, sodium/Inconel 718 heat pipes could be used more confidently. This work was instructive for the engineering application of alkali metal heat pipes.

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Sengottuvel, P., S. Satish Kumar i D. Dinakaran. "Optimization of Electrical Discharge Machining Process Parameters Using Desirability Approach". Applied Mechanics and Materials 159 (marzec 2012): 176–80. http://dx.doi.org/10.4028/www.scientific.net/amm.159.176.

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Inconel 718 is a high nickel content super alloy having high strength at elevated temperatures and resistance to oxidation and corrosion. EDM process has many advantages over traditional manufacturing process during the machining of inconel 718. In this study experiments were conducted based on the L16 orthogonal array on inconel 718 material using tungsten-carbide (W-C) electrode tool material with kerosene as a dielectric fluid to determine the optimum EDM parameters along with circle(C), square(S), rectangle(R) and triangle (T) tool geometry which contribute to material removal rate (MRR), tool wear rate (TWR) &surface roughness (SR) in machining of inconel 718. Data were optimized using Desirability approach technique. Experimental results show that the current and pulse on time are most influencing parameters that are directly proportional to MRR and inversely proportional to TWR, SR. The rectangle tool geometry gave better results compared to other geometry

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Tra, Tran Hung, i Atsushi Sano. "The microstructural characteristics in the dissimilar friction welding of superalloys Inconel 718 and Mar-M247". Vietnam Journal of Science and Technology 55, nr 2 (17.04.2017): 244. http://dx.doi.org/10.15625/0866-708x/55/2/8308.

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The dissimilar superalloys joint between Inconel 718 and Mar-M247 is fabricated by friction welding technique. The microstructure in and around the welding is investigated by the Scanning electron microscope (SEM) and Energy-dispersive X-ray spectroscopy (EDS). The welding is found to be free defects and the welded zone is quite narrow. The diffused zone between the two base metal is tine. The microstructure in the welded zone is recrystallized significantly and reveals a very complicated morphology and characteristics in Inconel 718 side. Inconel 718 and Mar-M247 could be joined successfully by the friction technique.

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Park, Hong Sun, Hyung Ick Kim, Yong Huh, Moon Young Kim, Sang Yeol Park, Jae Mean Koo i Chang Sung Seok. "A Study on the Degradation of the Superalloy Inconel 718 Using Ultrasonic Technique". Key Engineering Materials 353-358 (wrzesień 2007): 523–26. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.523.

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The Ni-based superalloy Inconel 718 (IN-718) was developed in the 1950s and is currently used for several critical gas turbine components due to its good balance of mechanical properties. Because of its stable mechanical properties at high temperature, the alloy is used for turbine bolts. The mechanical properties of in-service facilities are required to maintain safety operation in power plants. Ultrasonic tests, tensile tests and hardness tests were performed to evaluate the degree of the material degradation of Inconel 718. The mechanical properties decreased as degraded, but the longitudinal velocity of the ultrasonic signal increased. Also, the microstructure of the degraded Inconel 718 was to study the relationship between the result from ultrasonic test and the results from destructive methods.

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Kołodziejczak, Paweł, Mariusz Bober i Tomasz Chmielewski. "Wear Resistance Comparison Research of High-Alloy Protective Coatings for Power Industry Prepared by Means of CMT Cladding". Applied Sciences 12, nr 9 (30.04.2022): 4568. http://dx.doi.org/10.3390/app12094568.

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In this study, four protective coating materials: Inconel 718, Inconel 625, Alloy 33 and Stellite 6 were deposited on 16Mo3 steel tubes by means of CMT (Cold Metal Transfer), as an advanced version of MAG (Metal Active Gas) welding method. In the next step, the surface of the deposited coating was remelted by means of TIG (Tungsten Inert Gas) welding method. SEM microstructure of coatings–substrate has been reported, and an EDX-researched chemical composition of the coatings was compared to the nominal chemical composition. The hardness distribution in the cross-section was performed, which revealed that among investigated coatings, Stellite 6 layer is the hardest, at about 500 HV0.2. Other materials such as Inconel 625, Inconel 718 and Alloy 33 represented a cladded zone hardness about 250 HV0.2. Stellite 6 layer had the lowest wear resistance in the dry sand/rubber wheel test, and Stellite 6 layer had the highest wear resistance in the erosive blasting test. This proved the existence of different wear mechanisms in the two test methods used. In the dry sand/rubber wheel test, the Alloy 33 and Inconel 718 only represented higher wear resistance than substrate 16Mo3 steel. In abrasive blasting tests all coatings had higher wear resistance than 16Mo3 steel; however, Stellite 6 coatings represented an approximately 5 times higher durability than other investigated (Inconel 625, Inconel 718, and Alloy 33) coatings.

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Alauddin, M., M. A. El Baradie i M. S. J. Hashmi. "End-Milling Machinability of Inconel 718". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 210, nr 1 (luty 1996): 11–23. http://dx.doi.org/10.1243/pime_proc_1996_210_082_02.

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Most published research works on machining Inconel 718 have been mainly concerned with turning, while the milling process has received little attention due to the complexity of the process. In this paper a series of end-milling experiments of Inconel 718 has been carried out in order to: (a) optimize cutting variables, (b) investigate tool life values and relationships and (c) investigate surface roughness. The machining parameters have been optimized by measuring cutting forces. Tool life tests have been carried out using carbide inserts and the surface roughness has been analysed.

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R, Karthik, K. Elangovan i Girisha K G. "Development of Corrosion Resistant Laser Sintered Inconel 718 Material using Salt Spray Test". International Journal of Innovative Technology and Exploring Engineering 10, nr 2 (10.12.2020): 5–9. http://dx.doi.org/10.35940/ijitee.b8220.1210220.

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The conventional method is facing difficulty in manufacturing the nickel based alloys. Metal or composite components can be made using Direct Metal Laser Sintering (DMLS) process. Right now, Inconel 718 is a very much required alloy in defence, aerospace, chemical, oil and gas applications because of its admirable hot corrosion resistance and thermal –mechanical properties. In this research, we investigate the corrosion behaviour of the laser sintered and commercially available Inconel 718 alloy using salt spray test as per ASTM B117 for different exposing hours (24, 48, 72, 96, 120, 144, 168 hours). Samples prepared using laser sintering and commercially available Inconel 718 alloy were subjected to EDAX and SEM analysis to confirm the uniform distribution and chemical composition. Vickers Micro hardness test was conducted on samples to check surface hardness. From the results, it has been confirmed that prepared laser sintered Inconel 718 components shows the excellent corrosion resistance as compared to commercially available under harsh corrosion environment.

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Huang, Kaijin, Wei Li, Kai Pan, Xin Lin i Aihua Wang. "Microstructure and Corrosion Properties of La2Zr2O7/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding". Coatings 11, nr 1 (18.01.2021): 101. http://dx.doi.org/10.3390/coatings11010101.

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In order to improve the seawater corrosion resistance of Inconel 718 superalloy, a La2Zr2O7/NiCoCrAlY thermal barrier coating corrosion resistant to 3.5 wt.% NaCl aqueous solution was prepared by laser cladding on Inconel 718 superalloy. X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and electrochemical techniques were used to study the microstructure and the corrosion performance of the coating in 3.5 wt.% NaCl solution. The results show that the thermal barrier coating is mainly composed of primary La2Zr2O7 phase and γ + laves/δ phase eutectic structure. The corrosion potential and corrosion current of the coating in 3.5 wt.% NaCl solution are higher and lower than that of the Inconel 718 substrate, respectively, indicating that the corrosion performance of the coating is better than that of the Inconel 718 substrate. The presence of La2Zr2O7 phase in the thermal barrier coating is the main reason for its corrosion resistance to 3.5 wt.% NaCl solution.

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Mishra, Sidhesh. "Analyzing the Machining Effectiveness of EDM on Inconel 718 Using Copper and Graphite Electrode". YMER Digital 21, nr 08 (8.08.2022): 343–52. http://dx.doi.org/10.37896/ymer21.08/30.

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Inconel 718 is a nickel-based super alloy that is well suited for applications requiring high strength and better wear resistance in a varying temperature environment. Owing to its higher strength, most of the conventional machining techniques fail to machine Inconel 718 material. Electric discharge machining was found to be a good alternative to the conventional techniques to machine such superalloys. In this paper, the machining characteristics of Inconel 718 were investigated using copper and graphite electrode. A mixed-level Taguchi L18 orthogonal array is chosen to conduct the experiments with varying process parameters like tool material, pulse on time (Ton), voltage (v), and current (I). Material Removal Rate (MRR), Tool Wear Rate (TWR), and Surface roughness (Ra) are the performance characteristics selected for evaluation. The developed model was found to be in good agreement and the Cu tool gives the best result. Keywords: Electrical Discharge Machining, Inconel 718, Taguchi L18 array; Optimization, MRR, TWR,

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Gheorghe, Dan, M. Schwartz, Ion Ciuca i Robert Ciocoiu. "A Comparative Microstructure Evolution of AISI H21 and Inconel 718 in Cyclic Heating". Materiale Plastice 55, nr 3 (30.09.2018): 454–59. http://dx.doi.org/10.37358/mp.18.3.5050.

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The AISI H21 steel used for dies in copper hot extrusion softened only after several runs. To improve production parameters a new material was necessary for the die, and, as a first choice, Inconel 718 was preferred. Prior to adopting this material for new extrusion dies an experimental program with temperature exposure cycles was performed so as to study microstructure evolution within AISI H21 and Inconel 718. The samples were studied by optic and scanning electron microscopy (SEM) and were also submitted to X-ray diffraction (XRD) and microhardness tests. The results showed carbide coalescence, which led to softening, followed by a re-precipitation in the steel, while, in Inconel 718, the precipitation (in small amounts) of delta (ä) phase was observed.Using these results and combining them with practical experience with steel, we could predict that the Inconel 718 die performance is such that at least a double quantity of copper could be extruded per die.

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Li, Nan, Changshun Wang i Chenglin Li. "Microstructures and High-Temperature Mechanical Properties of Inconel 718 Superalloy Fabricated via Laser Powder Bed Fusion". Materials 17, nr 15 (28.07.2024): 3735. http://dx.doi.org/10.3390/ma17153735.

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The Inconel 718 superalloy demonstrates the potential to fabricate high-temperature components using additive manufacturing. However, additively manufactured Inconel 718 typically exhibits low strength, necessitating post-heat treatments for precipitate strengthening. This study investigated the microstructures and mechanical properties of the Inconel 718 superalloy fabricated via laser powder bed fusion. The room-temperature and high-temperature tensile properties of the Inconel 718 alloy samples following various post-heat treatments were evaluated. The results indicate that the as-built samples exhibited columnar grains with fine cell structures. Solution treatment resulted in δ phase formation and grain recrystallization. Subsequent double aging led to finely distributed nanoscale γ′ and γ″ particles. These nanoscale particles provided high strength at both room and high temperatures, resulting in a balanced strength and ductility comparable to the wrought counterpart. High-temperature nanoindentation analyses revealed that the double-aging samples exhibited very high hardness and low creep rates at 650 °C.

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Wolf, T., I. Iovkov i D. Biermann. "DISCONTINUOUS DRILLING OF INCONEL 718". MM Science Journal 2021, nr 3 (30.06.2021): 4569–75. http://dx.doi.org/10.17973/mmsj.2021_7_2021061.

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Inconel 718 as one of the most common nickel-base alloys is mainly characterized by its high-temperature strength. Thus, in particular drilling is subject to high tool wear due to high thermomechanical loads on the cutting edges. To reduce those effects an alternative process design of discontinuous drilling was developed which contains a periodical interruption of the machining process with the aim of a targeted wetting and cooling of the tool at regular intervals. Thus, a significant reduction of the thermal load on the tool should provide a benefit to the drilling process and extend the tool life. Numerical and experimental investigations were used to analyze the introduced process strategy modification.

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Sundararaman,, M., i P. Mukhopadhyay,. "Carbide Precipitation in Inconel 718". High Temperature Materials and Processes 11, nr 1-4 (styczeń 1993): 351–68. http://dx.doi.org/10.1515/htmp.1993.11.1-4.351.

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He, J., S. Fukuyama i K. Yokogawa. "Deformation bands in Inconel 718". Materials Science and Technology 11, nr 9 (wrzesień 1995): 914–20. http://dx.doi.org/10.1179/mst.1995.11.9.914.

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Xavior, M. Anthony, Mahesh Patil, Abheek Maiti, Mrinal Raj i Nitesh Lohia. "Machinability studies on INCONEL 718". IOP Conference Series: Materials Science and Engineering 149 (wrzesień 2016): 012019. http://dx.doi.org/10.1088/1757-899x/149/1/012019.

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Xue, Han, Wu Lijun, Xia Hui, Liu Runguang, Wang Shaogang i Chen Zhonglin. "Superplastic properties of Inconel 718". Journal of Materials Processing Technology 137, nr 1-3 (czerwiec 2003): 17–20. http://dx.doi.org/10.1016/s0924-0136(02)01055-5.

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