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 11 of 11 for “"hydrogen trapping"”.
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Hydrogen trapping in bearing steels: mechanisms and alloy design
Hydrogen embrittlement is a problem that offers challenges both to technology and to the theory of metallurgy. In the presence of a hydrogen rich environment, applications such as rolling bearings display a significant decrease in alloy strength and accelerated failure due to rolling contact …
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Modelling Precipitation of Carbides in Martensitic Steels
… are used for high-strength components, where hydrogen embrittlement is one of the major factors responsible for failure. It is believed that carbide particles can act as hydrogen trapping sites, thus reducing the risk of embrittlement. The thesis begins with a review of the physical metallurgy …
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Relationship between Microstructure, Properties and HICC Resistance of HSLA steel weld metals
… of microstructure, mechanical properties and hydrogen content on the hydrogen induced cold cracking (HICC) resistance of high strength low alloy (HSLA) steel weld metals were studied in this investigation. The weld metals were designed in a previous work. Their microstructures were …
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Effect of microstructural constituents on hydrogen diffusion in multiphase alloys
… is a strong link between microstructure and hydrogen diffusion and embrittlement in all metallic systems, the correlation between the two is poorly documented. It is, however, sorely needed as the current research shows that by quantifying the type and density of defects along with their …
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A coupled theory for diffusion of hydrogen and large elastic-plastic deformations of metals
… coupled-theory which accounts for diffusion of hydrogen, trapping of hydrogen, diffusion of heat, and large elastic-plastic deformations of metals is developed. Our theoretical framework places the widely-used notion of an "equilibrium" between hydrogen residing in normal interstitial lattice …
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Trapping of hydrogen in Hf-based high κ dielectric thin films for advanced CMOS applications.
… have been taken to understand the effects of hydrogen impurities in semiconductors and its behavior such as incorporation, diffusion, trapping and release with the aim of controlling and using it to optimize the performance of electronic device structures. In this dissertation, a systematic …
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Hydrogen embrittlement in nuclear and bearing applications: from quantum mechanics to thermokinetics and alloy design
Hydrogen embrittlement in ferrous and non-ferrous alloys is, and has been for over a century, a prominent issue within many sectors of industry. Despite this, the mechanisms by which hydrogen embrittlement occurs and the suitable means for its prevention are yet to be fully established. As hydrogen …
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Hydrogen Permeation Through Nickel And Nickel Alloys: Surface Reactions And Trapping
… by surface reactions or affected by internal trapping.<br></br><br></br>Analysis of data obtained for hydrogen permeation through nickel show that hydrogen is dissociatively chemisorbed in nickel.<br></br><br></br>The permeation parameters diffusivity, permeability and surface reaction rate …
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Mechanisms of layer-transfer related to silicon-on-insulator structures
… to study the mechanisms that affect an efficient hydrogenation process in silicon and to validate a hypothesis concerning the hydrogenation mechanism of pre-implanted silicon wafers under hydrogen-plasma processing. These studies are related to a general process. A trapping layer for hydrogen was …
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The first high-strength bainitic steel designed for hydrogen embrittlement resistance
The phenomenon of hydrogen embrittlement in steel has been known for over 150 years. Hydrogen-resistant alloys have been developed to mitigate this effect and three types of alloys with optimised structures have been enhanced over the years: nickel alloys, stainless steels, and quenched and …
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Chemomechanical modeling of hydrogen-induced degradation at high temperatures
Degradation of structural materials by hydrogen gas at high temperatures poses serious challenges to the safety of hydrogen technologies operating at elevated temperatures such as solid oxide fuel and electrolyser cells, hydrogen gas turbines, etc. The objective of this dissertation is to develop …