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Showing 1 to 20 of 38 for “"Inconel 718"”.
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Fatigue and fracture in Inconel 718-copper-Inconel 718 explosion-bonded composites
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1990.
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Modelling of the inertia welding of Inconel 718
… 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 …
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Fretting fatigue Behaviour of Inconel 718 at room and high Temperature
This thesis analyses the fatigue behaviour of Inconel 718, a Nickel-Chromium-based superalloy known for its excellent mechanical properties and high resistance to corrosion and oxidation, even at elevated temperatures. The study combines experimental testing and numerical simulations in order to …
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Investigation of die wear by modelling the extrusion of Inconel 718
… quantifying wear occurring in the extrusion of INCONEL 718 (IN718), nickel superalloy. To characterise wear, the process prediction which contributes to it must be identified and quantified. First, material characterisation was carried out using the Gleeble physical materials simulator. Then a …
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Surface integrity and energy consumption in machining of inconel 718 produced by selective laser melting
… microhardness have been characterized for the IN718 samples processed by the hybrid process. It has been found that surface integrity can be significantly improved by the hybrid SLM-milling route. To investigate the machinability of the deposited materials, energy consumption was collected and …
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A Correlation of Microstructure With Hot-Ductility in the Heat-Affected Zone of Inconel 718.
Increased performance requirements for structural components and the demand for materials with enhanced properties have significantly increased the problems involved in producing sound welds. Due to the high temperatures and steep temperature gradients in the vicinity of welds, high stresses and …
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A Quantitative Study of the Weldability of Inconel 718 Using Gleeble and Varestraint Test Methods
<p>Nickel super alloy Inconel 718 was tested and compared to Haynes 230 using Gleeble and Varestraint mechanical test methods. Hot cracking susceptibility was examined in either alloy using a sub-scale Varestraint test method at 5 augmented strain levels: 0.25%, 05.%, 1%, 2%, and 4%. Maximum crack …
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Multi-scale investigations of the Resistance to helium embrittlement with Direct Energy Deposited Inconel 718
… (DED) was utilized with the existing alloy, Inconel 718. Based on previous works with DED and laser welding, it was hypothesized that nano-sized pores could be engineered within the matrix of the sample to maximize the number of available sinks for helium bubbles to migrate towards, instead …
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Interfacial structure of delta phase in Inconel 718 and the selection of precipitate habit planes
… precipitates of the δ (orthorhombic) phase in Inconel 718. Based upon transmission electron microscopy (TEM) observations, the average habit plane was confirmed to be (111)<sub>γ</sub> which is consistent with previous reports. A parallel array of misfit dislocations with Burgers vector …
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Nanoindentation of copper covetics and the mechanical testing and microstructural imaging of additive manufactured Inconel 718
… materials (covetics) and additive manufactured Inconel. Recent efforts have led to the discovery of a new class of material called covetics, in which metal and carbon are combined in a new way via a hybrid of metallic and covalent bonds. First, nanoindentation is used to evaluate the mechanical …
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SUSTAINABLE FACE MILLING OF INCONEL 718 USING MQL AND NANOFLUIDS MQL WITH VEGETABLE OIL AS BASE FLUID
… were used to evaluate the machinability of Inconel 718 under the HOSO-MQL at varying oil flow rates. The results show that flow rate at 70 ml/h and air pressure of 4.14 bar gave the longest tool life comparable to that of CEF-CS and improves machinability by providing enough thin lubrication …
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Improvement of machinability and surface integrity during electro discharge machining of inconel 718 using nano powder suspension dielectric
Inconel 718 is one of the most difficult to cut material due to its, high hardness, high toughness, and poor thermal conductivity results in heat concentrated in the cutting zone, making it ineffective to be processed through conventional machining. So usually, an electrical discharge machining …
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Mechanistic modeling of cutting forces in wavy-edge bull-nose helical end-milling of Inconel 718 under different cooling-lubrication strategies
… cutting force in high-speed end-milling of Inconel 718 under two cooling strategies: emulsion and Minimum Quantity Lubrication (MQL). The effects of the cooling strategies are incorporated into the mechanistic model through six cutting force coefficients (K<sub>tc</sub>, K<sub>rc</sub>, …
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Laser surface treatment of materials with presence of carbides at the surface.
… is carried out for pre-prepared Haynes 188 and Inconel 718 alloys, and high speed steel workpieces. Metallurgical and morphological changes in the laser treated layer are examined using Scanning Electron Microscopy, Energy Dispersive Spectroscopy, and X-ray Diffraction. A carbon film of about 50 …
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Effects of milling methods, cooling strategies and end-mill coatings on machinability in high speed end-milling of Inconel- 718 using carbide end-mills
<p>“Inconel-718 superalloy is used extensively in aerospace and nuclear industries due to its excellent properties such as: high strength-to-weight ratio, ability to retain its properties at high temperature, high corrosion and creep resistance. However, Inconel-718 is characterized as a …
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The effect of the build orientation and heat treatment on the fatigue and fracture properties of a directed energy deposited nickel-based superalloy (Inconel 718)
… properties of the nickel-based superalloy, Inconel 718 that has been manufactured by additive manufacturing technique, directed energy deposition (DED). Three different build orientations namely XY, XZ and ZX, in both the as-built and heat-treated conditions were tested through a combination …
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Analýza deformačně napěťového chování přítlačné talířové pružiny v sestavě turbodmychadla za vysoké teploty
… s cílem posouzení, zda lze stávající materiál Inconel 718 nahradit levnější superslitinou Inconel X-750. Pružina musí po celou dobu provozu vyvozovat předepsanou přítlačnou sílu. Vlivem vysokého teplotního zatížení dochází k tečení materiálu, které způsobuje relaxaci napětí a pokles přítlačné …
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Wear of Polycrystalline Cubic Boron Nitride Cutting Tools when Machining Nickel-based Superalloys
… to machine Ni-based superalloys - in particular Inconel 718. While there have been other studies on the machining of this alloy using PcBN tools, and the types of wear that occur have been described, the underlying mechanisms are still not well understood. With a better understanding of the …
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Development of Materials for Extreme Environment Applications by Laser Powder Bed Fusion
… for four candidate vacuum vessel materials, Inconel 718 is identified as the most likely selection for construction of an initial ARC pilot plant in the short-term. Maximizing the lifetime of such a vessel will require tailoring properties to increase resistance to neutron effects and, …
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