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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 19 of 19 for “"high temperature creep"”.
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The Analysis of High Temperature Creep in Shallow Domes
Made available in DSpace on 2014-12-05T17:37:13Z (GMT). No. of bitstreams: 1 6100123.pdf: 2282374 bytes, checksum: 78b5b06886f2f4ef6dabcf0e119450f7 (MD5) Previous issue date: 1960
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High temperature creep behavior of Inconel 617 and Haynes 230
The high temperature gas-cooled reactor (HTGR) has been selected for the Next Generation Nuclear Plant (NGNP) project. The structural materials of HTGR will serve in the temperature range of 760-950oC and withstand coolant pressure up to 7 MPa for a design life of 60 years. Currently, Ni-based …
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High temperature creep-fatigue behavior of alloy 617 and alloy 230
The Very High Temperature Reactor (VHTR) is one of the Gen-IV reactor design concepts which embody a common goal of providing safe, longer lasting, proliferation-resistant, and economically viable nuclear energy. One of the biggest challenges in the research and development of Gen-IV reactor …
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Physical simulation of high temperature creep in systems with dynamic concentration gradients
Includes bibliographical references (pages 155-165).
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Characterization of high temperature creep in siliconized silicon carbide using ultrasonic techniques
… containing various degrees of damage due to high temperature creep. These results were compared with parameters associated with creep damage such as strain and cavity formation, in order to better understand the mechanisms of creep in Si/SiC and to determine if ultrasonics can be used in …
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Influence of High Temperature Creep upon the Structure of ß-NiAl and ß-NiAl(Fe) Single Crystals
… to characterise quantitatively the influence of high temperature creep upon the structure of ß-NiAl and ß-NiAl(Fe) single crystals. A non-destructive procedure is established following the classic line of X-ray structure analysis, namely controlling the chemical composition with the electron …
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Effect of Porosity on the Creep Rupture Behavior of Low Alloy Steel Weldments.
… on a study of the effects of porosity on the high temperature creep characteristics of low-alloy steel weldments. The material selected for investigation was ASTM A387-D, a 2-1/4% Chromium - 1% 15 Molybdenum low-alloy steel. This material is used in the fabrication of nuclear and …
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A phase field model for the gallium permeation of aluminum grain boundaries
… fracture toughness, corrosion susceptibility and high temperature creep are influenced by grain boundary physics. The structure of grain boundaries affects their properties. In this thesis, we have developed a predictive model for a particular grain boundary structure-property relationship: the …
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Degradation and Failure Analysis of Environmental Barrier Coatings under Adverse Operating Environment: Multi-Physics Modelling
… and water-vapor-induced degradation under high-temperature operating conditions. The premature failure of EBCs, particularly delamination along the interfaces of thermally grown oxide (TGO) poses major challenges to coating reliability. This research presents a systematic study of the …
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High energy x-ray diffraction microstructural analysis of oxide dispersion strengthened steel for advanced nuclear systems
… exhibits exceptional radiation resistance and high-temperature creep strength when compared to traditional ferritic and martensitic steels. ODS steel has been considered one of most promising structural materials for advanced nuclear systems. In this study, we applied the high-energy …
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Thermo-mechanical model of steel shell behavior in continuous slab casting
… obtained from a separate fluid flow model. The high temperature creep and plasticity of the steel is incorporated through a unified constitutive law defining the inelastic strain rates as a function of temperature, composition, accumulated plastic strain and the stress state. The model has been …
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Thermal and Thermo-Mechanical Analyses of Wire Bond vs. Three-dimensionally Packaged Power Electronics Modules
… results show a significantly lower junction temperature of 17oC in the MPIPPS module than that in the wire bond module, due to the more uniform heat flow distribution in the MPIPPS module. The top DBC (direct bonded copper) substrate in the MPIPPS module helps direct the excessive heat …
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Silicon and oxygen self-diffusion in forsterite and implications to upper-mantle rheology
… diffusion coefficient in dry forsterite The high temperature creep of olivine is believed to be controlled by self-diffusion of olivine. However, the experimentally measured silicon diffusion coefficients (DSi) [Dohmen et al., 2002; Jaoul et al., 1981] were about 2-3 orders of magnitude lower …
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Analysis and modelling of the dislocation response during non-isothermal creep in Ni-SX superalloys
… for turbine blades in modern aircrafts. The temperatures and stresses in the turbine are subject to continuous change during in-flight operation. The deformation rates of the turbine blades during operation are currently approximated based on isothermal creep tests. This dissertation seeks to …
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Creep characterization of single crystal silicon in support of the MIT Micro-Engine Project
… Due to its low brittle-to-ductile transition temperature, silicon is not ideal for a production engine. However, the microfabrication technology for silicon is far more advanced than other candidate materials making it the best short-term option. In support of the micro-engine project, this …
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Sources of thermally generated vacancies in single-crystal and polycrystalline gold
… such as sintering, the Kirkendall effect, high temperature creep, polygonization and many other diffusion controlled processes. In spite of their importance very little is known about the fundamental properties of vacancy sources. For example, it is not known if a vacancy can form with the …
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Stress and creep damage evolution in materials for ultra-supercritical power plants
The so-called creep strength enhanced ferritic (CSEF) 9-12% Cr steels have been identified as the most promising class of materials for some of the key components in ultra-supercritical fossil-fired power plants, including the main steam pipes, headers and superheater tubings. These steels are less …
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Creep and Elevated Temperature Mechanical Properties of 5083 and 6061 Aluminum
… of the behavior of aluminum at elevated temperatures. The aluminum samples 5083-H116 and 6061-T651 were examined under a variety of loading conditions and temperatures. Tensile testing was completed on both materials to measure strength properties of elastic modulus, yield strength, and …