The Design, Construction and Implementation of a Novel State-of-the-Art Thermal Desorption Spectrometer for the Study of Hydrogen Embrittlement of Medium Strength Steels

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Gray, Evan

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2016
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Abstract

The hydrogen embrittlement of materials is a major concern for the steel industry, this project is motivated by the need of an accurate quantification of small amounts of absorbed hydrogen in steels and understand the kinetics of desorption of hydrogen from within the steel. A novel thermal desorption spectrometer (TDS) has been designed, assembled, tested and calibrated to investigate the intriguing kinetics of hydrogen in steels and consequently be used as a tool to understand the hydrogen embrittlement phenomenon. In Chapter 1, a brief literature review of the wide use of medium and high strength steels in industry is presented to highlight the importance of the potential influence that hydrogen embrittlement has nowadays in the global economy. Likewise, a summary of the relevant work performed throughout the last decades on the understanding of this phenomenon is presented. A major comparison between the available techniques for the quantification of hydrogen in steel and other materials is also displayed highlighting the advantages and disadvantages of thermal desorption spectroscopy as a tool to measure hydrogen content in steels. Finally, the current mathematical theory is described and explained to model the kinetics of hydrogen absorbed in steels. Chapter 2 encompasses the major and latest knowledge gained for the understanding of hydrogen embrittlement using thermal desorption spectroscopy. This chapter includes a comparison between the different techniques and approaches by previous researchers to use the thermal desorption of hydrogen to tackle the hydrogen embrittlement on steels and other materials. Finally, the major contributions of TDS on the surface and non-surface science are examined in detail, the mathematical approach used is described in detail and comparisons between the different approaches are discussed.

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Thesis (PhD Doctorate)

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Doctor of Philosophy (PhD)

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School of Natural Sciences

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The author owns the copyright in this thesis, unless stated otherwise.

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Hydrogen embrittlement of materials

Thermal desorption spectrometer

Medium strength steels

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