Search for dissertations about: "Keywords: TEM"

Showing result 1 - 5 of 11 swedish dissertations containing the words Keywords: TEM.

  1. 1. Aspects of microstructural evolution in chromium steels in high temperature applications

    University dissertation from Stockholm : Materialvetenskap

    Author : Åsa Gustafson; KTH.; [2000]
    Keywords : Cr-steels; nucleation; coarsening; model; DICTRA; precipitates; carbides; carbo-nitrides; MX; VN; M23C6; TiC; TEM; EFTEM; Curie-temperature;

    Abstract : In this thesis 9-12 % Cr steels, used for high-temperaturecomponents in fossil-fired power plants are considered. Thecreep strength of thees steels depend on their microstructurethat consists of a matrix of tempered lath martensite withdensely distributed precipitates. READ MORE

  2. 2. Microstructure of a cubic boron nitride tool material before and after hard turning

    University dissertation from Stockholm : Materialvetenskap

    Author : Jenny Angseryd; [2008]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; EELS; cBN; microstructure; PCBN; adherent layer; EDX; wear; SEM; EFTEM; TEM;

    Abstract : AbstractPolycrystalline cubic boron nitride (PCBN) materials are widely used in turning of hardened steels due to their beneficial mechanical properties like high hardness at elevated temperatures and, compared to diamond, for being more chemically stable towards iron at temperatures typical for turning operations (800-1000˚C). The wear of PCBN tools is influenced by several factors, like machining parameters, different tool geometries and varying composition of PCBN tools as well as workpiece material. READ MORE

  3. 3. Study on the Mechanisms for Corrosion and Hydriding of Zircaloy

    University dissertation from Stockholm : Materialvetenskap

    Author : Magnus Oskarsson; KTH.; [2000]
    Keywords : Zircaloy; Zirconium alloys; Oxidation; Oxide layer; Pre-Transition; Hydriding; Pre-Hydrided; Hydrides; Lithium Hydroxide LiOH ; Lithiated water; Dissolution; Cross sectional TEM;

    Abstract : This thesis is focused on the mechanisms for corrosion andhydriding of Zircaloy. Special attention is paid tomicrostructural characterisation by cross sectionaltransmission electron microscopy of the oxide layer formed. READ MORE

  4. 4. Characterization of losses in ridge, groove and microstrip gap waveguides

    University dissertation from Stockholm : Materialvetenskap

    Author : Elena Pucci; [2011]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : The gap waveguide is a new technology that recently has been presented as an attractive candidate for applications at millimeter and sub millimeter waves. The waveguide is generated in the gap between a smooth upper metal plate and a ridge (or a groove) in a textured lower metal plate. READ MORE

  5. 5. Hydrodeoxygenation (HDO) catalysts Characterization, reaction and deactivation studies

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Houman Ojagh; [2018]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Renewable diesel; Sulfided phase; Carbon deposition; Poisoning; Hydroconversion; Deactivation; Brønsted acid sites; Ring opening; Hydrodeoxygenation HDO ;

    Abstract : Hydrodeoxygenation (HDO) catalysts Characterization, reaction and deactivation studies Houman Ojagh Department of Chemistry and Chemical Engineering Chalmers University of Technology Abstract Production of biomass derived fuels such as renewable diesel, are primarily intended to reduce the reliance of the conventional engines on petroleum fuels as well as the emission of CO2 from fossil hydrocarbons. Hydrodeoxygenation (HDO) is a powerful technique that has been regularly used in the fuel upgrading processes. READ MORE