Global ETD Search
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 12 of 12 for “"High-temperature Alloys"”.
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Friction stir welding of high temperature alloys
… iron-based oxide dispersion strengthened (ODS) alloys (MA754 and MA956) has been studied. The main aspects covered include tool evaluation, microstructural evolution, mechanical properties, and correlation between processing, microstructure and mechanical properties. Tool performance study was …
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Modeling and simulation of creep rupture in high-temperature alloys
… that one of the main causes of rupture in high-temperature alloys is intergranular cavitation: the nucleation, growth, and coalescence of voids along grain boundaries. It is also well known that intergranular voids grow under the influence of several physical processes, including matter …
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On the oxidation of high-temperature alloys, and its role in failure of thermal barrier coatings
… studied in the literature. We simulate the high-temperature oxidation of FeCrAlY, and show that our theory is capable of reproducing with reasonable accuracy the oxide thickness evolution with time at different temperatures, the shape distortion of the specimens, as well as the development …
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Novel integrated computational approach for designing Fe-Ni-based alloys
A novel computational approach for designing high temperature alloys is proposed; the approach incorporates properties prediction and optimisation. As for properties prediction, microstructural parameters, such as the volume fraction and precipitate size after heat treatment (replicating the …
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Utilization of Sodium Flame Synthesis for the Formation and Deposition of Pure Metal Materials for Applications in Additive Manufacturing
<p>Advanced material classes, such as high temperature alloys, ceramics, and refractory materials have become a key area of focus for expansion in the realm of additive manufacturing. Factors such as high melting points, material homogeneity, and physical properties such as ductility limit the …
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Nickel-based designed materials manufactured via laser-based powder bed fusion of metals for high-temperature applications
… friendly fuels must be used, or the already high efficiency must be further increased. Future LGT generations are probably going to have higher hot gas temperatures in both scenarios. As a result, hot gas components must become more temperature resistant, for example by using high-temperature …
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Mold, flow, and economic considerations in high temperature precision casting
Casting high temperature alloys that solidify through a noticeable two phase region, specifically platinum-ruthenium alloys, is a particularly challenging task due to their high melting temperature and this necessitates careful design of the mold material and mold geometry to produce defect free …
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Design considerations of a 15kW heat exchanger for the CSPonD Project
… was priced at $7.82/kg. A selection of high temperature alloys capable of withstanding the high operating temperatures of molten salts were chosen as candidate materials for the heat exchanger and ranked based on the allowable stress levels near the operating temperature range of the …
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The role of alloying elements on the microstructure and thermal stability of Refractory Metal High Entropy Superalloys
… future generations of aeroengines. Consequently, higher operational temperatures will be needed, beyond the capabilities of current nickel-based superalloys. Therefore, new high temperature alloys are being investigated, including refractory metal high entropy superalloys (RSAs), based on the …
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Oxidschichtbildung und Materialprobleme metallischer Werkstoffe bei Verbrennungsprozessen mit Heizöl EL
… of the oxide scale formation on metallic high-temperature alloys resulting during reaction with the atmosphere of the combustion of industrial gas oil (IGO). The Ni-Cr-based alloys 601 (2.4851), 602 (2.4633), 603, 693 and 617 (2.4663) were tested at elevated temperatures between 900°C and …
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Surface degradation and creep of Inconel 617 and Haynes 230 at high temperatures
The high temperature gas-cooled reactor (HTGR) design has been selected for the Next Generation Nuclear Plant (NGNP) project. The helium coolant in the primary circuit has been found to contain low levels of impurities (e.g. CO, CO2, H2O, CH4, and H2) after steady-state operation. This can lead to …