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Showing 1 to 20 of 91 for “"Superalloy"”.
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Deformation mechanisms in a polycrystalline Ni-based superalloy
… and optimise new and existing Ni-based disc superalloys. For this purpose, this work investigates the deformation behaviour of the established coarse-grained RR1000 alloy between around 650°C and 750°C within the stacking fault (SF) shear regime in order to identify the active deformation …
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Creep deformation in nickel base superalloy single crystals
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 1989
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Shielding Effectiveness of Superalloy, Aluminum, and Mumetal Shielding Tapes
… 1 GHz. The three shielding tapes used included superalloy, aluminum, and mumetal. Calculations for Shielding Effectiveness involve the computation of Absorption Loss, Reflection Loss, and Re-Reflection Correction Factor. From the outcome of the calculations, it was suitable to conclude that all …
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Hot forging of the nickel-base superalloy ATI 718Plus
Nickel-base superalloys are widely applied in the hot section of aero engines due to their high temperature capabilities and excellent mechanical properties. For turbine discs, polycrystalline nickel-base superalloys are used where they experience temperatures up to 700ºC and stresses as high as …
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The microstructure and properties of powder HIPped nickel-based superalloy CM247LC
The response of powder of the Nickel-based superalloy CM247LC to a range of Hot Isostatic Pressing (HIPping) conditions and post-HIP heat treatments has been investigated as a preliminary step in the assessment of net shape HIPping as a possible process-route for component production. A HIPping …
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Net-shape hot isostatic pressing of a nickel-based powder superalloy
Microstructural analysis and mechanical property assessment have been carried out on hot isostatically pressed (HIPped) and heat treated samples of RR 1000 powder to assess Net Shape HIPping as a process-route for aero engine components. HIPping led to (Hf,Zr)-rich oxides and carbides on prior …
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Understanding surface and sub-surface phenomena in nickel-based superalloy castings
Nickel-based superalloys are high-temperature materials, created to operate in the aggressive conditions found within gas turbine engines. Single crystal turbine blades are investment cast, followed by a complex series of operations including heat treatment, machining, blasting, etching and …
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Compositional Optimisation of a Ni-based Superalloy for Additive Repair Applications
… components. However, processing of the Ni-based superalloys used by the aerospace industry through AM has encountered numerous issues. Certain complications can be resolved through intense post-processing. Although, such mitigation strategies are not appropriate for repaired material as intense …
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Thermal fatigue oxidation and SO₂ corrosion of an aluminide-coated superalloy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1986.
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Weld development for Incoloy alloy 908, a low thermal expansion superalloy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1995.
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High temperature fracture behaviour of laser-powder bed fusion produced nickel superalloy
… between strength and fracture toughness in AM superalloys.
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Directional Recrystallization of an Additively Manufactured Oxide Dispersion-Strengthened Nickel-Base Superalloy
This thesis investigates the recrystallization behaviors of an additively manufactured (AM) oxide dispersion-strengthened (ODS) NiCoCr medium entropy alloy, focusing specifically on the effects of a liquid phase, annealing twins, and aluminum microalloying additions on recrystallization kinetics. …
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Process development and characterization of an oxide dispersion stabilized nickel base superalloy
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1982.
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The Role of Slip System Activation on Ni-Based Superalloy High Temperature Fatigue
<p>Nickel-based superalloys are used extensively in the aviation industry, particularly in aircraft engine components. These materials are desirable due to their high strength, resistance to creep, corrosive environment, and high temperature. It has been well documented that material fatigue is …
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Additive manufacturing of stiffness optimised auxetic bone scaffold using cobalt-chromium-molybdenum superalloy
Auxetic materials offer unconventional strain behaviour owing to their negative Poisson’s ratio (−𝜐) leading to deformation modes and mechanical characteristics different to traditional porous architecture. This can lead to favourable outcomes for load-bearing tissue engineering constructs, such as …
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Grain boundaries and creep deformation mechanisms in a high performance nickel-based superalloy
… Alloy 12-1 polycrystalline nickel-based superalloy for disc application in gas turbine engines. In particular, this study aims to progress the understanding of the effect of grain boundaries in relation to the content of minor additions such as C, B and Zr. This was achieved by creep …
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Metallographic study of gamma - gamma prime structure in the Ni-based superalloy GTD111
… commercial and scientific interest. Ni-based superalloy GTD111 is used at a number of GE-manufactured power generation turbines. The outstanding creep resistance features of Ni-based superalloys can be attributed to a large extent, to the gamma prime ([gamma]') precipitates found within the …
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Carbide formation in a nickel-based superalloy during electron beam solid freeform fabrication
… manufacture and safe use of certain nickel-base superalloy parts, notably turbine disks. The growth of carbide particles from the liquid during EBSFF processing of Alloy 718 has been modeled assuming diffusion control and isolated spherical carbides. The driving force for growth is assumed to …
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