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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"Hastelloy"”.
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Fabrication & Mechanical Properties of Hastelloy-X Matrix Ceramic Composite
… of sealing materials. In this thesis, porous Hastelloy-X alloy scaffolds with 80% porosity, currently used for fabricating seals in turbine applications, were used as the base material. The microstructure of the porous Hastelloy-X scaffolds was infiltrated using a room temperature curing …
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Fatigue behavior of Hastelloy-X at elevated temperatures in air, vacuum and oxygen environments.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Materials Science and Engineering.
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Onset of Arizona Road Dust in High Temperature Environment on a Cooled HASTELLOY X Surface
… diagnostics. Testing was performed using HASTELLOY® X coupons and Arizona Road Dust with main gas flow temperatures between 1050°C and 1100°C. Arizona Road Dust sample with sizing between 2µm and 40µm were used for experimental testing. The sensitivity of the initial deposit formation on …
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Experimental Investigations of the Onset of Sand Deposits on Hastelloy-X between 1000 C and 1100 C
… the deposition of Arizona Test Dust (ATD) onto Hastelloy X. The first study presented in this thesis describes a preliminary investigation of sand deposition at temperatures and velocities similar to those found in the turbine section of propulsive gas turbine engines and presents an equation …
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Thermo-mechanical response and plastic deformation behavior of Hastelloy X at elevated temperatures — role of dynamic strain aging
In this work, the plastic behavior of Hastelloy X subjected to thermo-mechanical loading is investigated, and the phenomenon of dynamic strain aging is studied under isothermal and temperature jump experiments, using the technique of digital image correlation (DIC). The material of interest, a …
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Growth and characterisation of textured superconducting tapes
… NiW tapes, 310 austenitic stainless steel and Hastelloy C276 by the ultrasonic Spray Pyrolysis technique, using magnesium nitrate and magnesium acetate as precursors at many different conditions. Thermogravimetrical analysis (TGA) of the decomposition of the precursors was used as a guideline …
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Quantitative understanding of the role of grain boundaries in polycrystalline deformation via multiscale digital image correlation
… plastic strain accumulation in polycrystalline Hastelloy X, a nickel-based superalloy, subjected to monotonic and cyclic loading conditions. In addition, the underlying microstructure was characterized with similar spatial resolution using electron backscatter diffraction (EBSD). The …
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An Investigation of Major Component Disposal Costs for Advanced Nuclear Reactors
… components were modelled as either SS316 or Hastelloy N based with an operating period of 5 to 10 years. Graphite reflectors were Class C waste with a specific disposal cost of about $2,200/kg. The core can was greater than Class C waste for both Hastelloy N and SS316. The vessel was Class C …
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Investigation into the Hydrothermal Treatment of Sugarcane Bagasse under Near- and Supercritical Conditions
… A side by side comparison of runs conducted in a Hastelloy X bomb and a titanium bomb revealed possible wall effects. The titanium bomb run produced 13 times more CO than the Hastelloy X bomb run along with at least 60 ppm of H2S. Lower hydrocarbon yields from the former run also support the …
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Consideration of fuel behaviour in AGR-like FHR reactor design
… avoided by switching the cladding material to Hastelloy-N, with a lower thermal expansion and better corrosion resistance to molten salt. Although the Hastelloy-N cladding does not fail, the deformation is still large, exacerbating fuel temperature, fission gas release (FGR) and pressure …
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Feasibility Study of a Natural Uranium Neutron Spallation Target using FLiBe as a Coolant
… natural uranium with a proton beam incident on a Hastelloy-N window. The supporting structures were created from Hastelloy-N due to their anti-corrosive properties of molten salts such as FLiBe and their resistance to neutron damage. The final design chosen was a "Sandwich" design utilizing a …
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Experimental Investigation of Temperature Effects on Microparticle Sand Rebound Characteristics at Gas Turbine Representative Conditions
… materials used were stainless steel 304 and Hastelloy X. The particles impinged on the target coupon at a velocity of 28m/s. Tests were performed at three different temperatures, 300 K (ambient), 873 K, and 1073 K to simulate temperatures seen in gas turbine cooling flows. The angle of …
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Investigation of thermal effects on fatigue crack closure using multiscale digital image correlation experiments
… the thermal effects on fatigue crack closure of Hastelloy X, a nickel-based superalloy. Using multiscale, digital image correlation (DIC), macroscale experiments were performed at 2x magnification (2 µm/pix), providing full-field crack closure measurements. Microscale experiments performed at 10x …
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Telluridm-induced corrosion of structural alloys for nuclear applications in molten salts
… 50 h, 100 h, and 150 h corrosion tests on alloys Hastelloy N, Nickel-201, Incoloy 8ooH, and 316L Stainless Steel are presented. Upon inspection of the corroded surfaces of each alloy after its immersion in molten LiF-NaF-KF (FLiNaK) salt at 700 °C using scanning electron microscopy (SEM) and …
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Corrosion by molten mixtures of sodium carbonate and vanadium pentoxide
… cent sodium carbonate. Tests were also made with Hastelloy B, Hastelloy X. and 347 stainless steel. The metal specimens were coated with the slag, heated at a constant temperature in a combustion furnace for up to 36 hours, and cleaned and weighed to determine weight loss. The slag and corrosion …
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Field Emission Based Sensors Using Carbon Nanotubes
… deposition (CVD) on various substrates: Ni and Hastelloy gauze, 304 stainless steel (SS) plates, and Ni-coated Si wafers. Either C<sub>2</sub>H<sub>2</sub>/Ar (or N<sub>2</sub>) source gases were used in a temperature range from 650–780°C. Nanotubes were produced with diameters that varied from …
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Experimental and ab initio investigations into the fundamentals of corrosion, in the context of supercritical water oxidation systems
… at transitional temperatures (100-400° C) in a Hastelloy C-276 tube is examined through post-failure analysis and controlled exposure experiments. Dealloying and intergranular corrosion were observed. Dealloying rate was found to be strongly correlated with temperature and dielectric constant. …
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Decommissioning considerations for molten salt type reactors
… remelting and drainage of residue FLiNaK from a Hastelloy-C276 segment. The results of these experiments have demonstrated that FLiNaK salt, given contact with atmospheric moisture, tends to change in condition over time and migrate from one location to another as a result of hygroscopy and …
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Relating fatigue crack growth to microstructure via multiscale digital image correlation
… was observed in a nickel based superalloy, Hastelloy X, at the grain level. A novel high resolution ex situ DIC technique was developed and used to measure accumulated strain fields in the plastic wake of a fatigue crack. Additionally, the evolution of the strain field as the fatigue crack …
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Experimental Investigation of Initial Onset of Sand Deposition in the Turbine Section of Gas Turbines
… velocity of 70 m/s. The target coupon is made of Hastelloy X, a nickel-based alloy and the angle at which the particles impact the coupon varies from 30° to 80°. The experiments were performed with different amounts of total particle injected, concentration, and coupon angle to understand their …
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