Browsing Institutt for materialteknologi by Issue Date
Now showing items 221-240 of 2534
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Modeling of Hydrogen Diffusion in 25% Cr Super Duplex Stainless Steel
(Master thesis, 2012)Over the last years, several failures in duplex and super duplex stainless steel structures in subsea applications are reported to be a result of hydrogen induced stress cracking. One main source of hydrogen is found to ... -
Metal-producing Mechanisms in the Carbothermic Silicon Process
(Master thesis, 2012)The mechanisms in the carbothermic production of silicon have been examined in this report. Through the investigation of a pilot scale furnace as well as five small scale induction furnace experiments, a better understanding ... -
Thermal characterisation of anode materials for Li-ion batteries
(Master thesis, 2012)Coin cells with lithium and graphite electrodes were assembled using different combinations of graphite material and electrolyte. Specifically, three commercially available graphite materials and five electrolyte compositions ... -
Removal of boron from silicon by slag treatment and by evaporation of boron from slag in hydrogen atmosphere
(Master thesis, 2012)Background and objective: Removal of boron is one of the main challenges in the purification of metallurgical grade silicon (MG-Si) for solar cells and a simple low cost method is therefore needed. Boron removal by slag ... -
Structural and electrochemical characterization of graphite materials for Li ion batteries
(Master thesis, 2012)The purpose of this study is to find a correlation between the crystallite sizes in thebasal plane direction of graphite materials, used in carbon anodes in Lithium-ionbatteries. Carbon anodes are the most common type of ... -
Deformation defects and electron irradiation effect in nanostructured Al-Mg alloy processed by severe plastic deformation
(Journal article; Peer reviewed, 2012)In order to explore the exact nature of deformation defects previously observed in nanostructured Al-Mg alloys subjected to severe plastic deformation, a more thorough examination of the radiation effect on the formation ... -
Kimdanning av sprøbrudd i simulert grovkornet HAZ i et arktisk stål
(Master thesis, 2012)Det har blitt estimert at 30 % av verdensuoppdagede gassreserver og 13 % av verdens uoppdagede oljereserver ligger i de polare områdene i nord. Man trenger derfor materialer som tåler lave temperaturer for å hente opp denne ... -
AC Induced Corrosion of Carbon Steel in 3.5wt% NaCl Electrolyte
(Master thesis, 2012)This paper deals with alternating current (AC) corrosion of low alloy carbon steel in 3.5 wt% NaCl electrolyte. Accelerated corrosion rates have been reported when exposed to AC and the corrosion mechanism is not well ... -
AC corrosion on cathodically protected steel
(Master thesis, 2012)This report deals with the effect of alternating current on cathodically protected steel. AC corrosion has become relevant in the offshore industry due to the introduction of the direct electric heating system (DEH). The ... -
Mikrostruktur og mekaniske egenskaper for skrueekstrudert aluminium: Karakterisering av skrueekstrudert aluminium etter ulike rensmetoder av råmaterialet
(Master thesis, 2012)Det er aktuelt å bruke restaluminium fra produksjonsindustrien som råmaterialet til skrueekstrudering. Restaluminiumet inneholder forurensinger som blant annet skjæreolje. Dette arbeidet har fokusert på ulike rensemetoder ... -
A method for comparing the HF formation potential of aluminas with different water contents
(Chapter, 2012)In the aluminium industry today, smelters often have to rely on more than one alumina supplier. This creates diversity in the properties of smelter grade alumina (SGA). A method has been developed to compare the HF formation ... -
In-Situ Tensile Testing Combined with EBSD Analysis of Ti-6Al-4V Samples from Components Fabricated by Additive Layer Manufacture
(Master thesis, 2012)ALM-based production of Titanium components shows great promise in supplying cost-effective products within industries such as energy, chemical processing and aerospace. In common for all is high quality demands. This ... -
Texturing of lead-free piezoelectric ceramics
(Master thesis, 2012)A procedure for texturing of lead-free piezoelectric ceramics based on sodium potassium niobate (KNN) was investigated with respect to texturing procedure and choice of materials.Material compositions that were considered ... -
The Kinetics of Boron Transfer in Slag Refining of Silicon
(Journal article; Peer reviewed, 2012)Slag refining is one of the few metallurgical methods for efficient removal of boron from silicon. In industrial slag refining for production of silicon for photovoltaic applications, the relationship between the slag ... -
Coated Wooden Claddings and the Influence of Nanoparticles on the Weathering Performance
(Journal article; Peer reviewed, 2012)Accelerated climate aging experiments and cup measurements have been performed to investigate the effect of adding TiO2 nanoparticles and nanoclay to acrylic stain coatings against the influence of weathering. The coated ... -
Investigation of Carbon Block/Cast Iron/Collector Bar Interfaces in Aluminum Electrolysis
(Master thesis, 2012)The chemical events occurring at the carbon/cast iron/collector bar interface that might have an impact on the cathodic voltage drop in aluminum electrolysis is elucidated in this thesis. The primary aluminum production ... -
Microstructure and mechanical properties of Al-xMg alloys processed by room temperature ECAP
(Journal article; Peer reviewed, 2012)Microstructure development and mechanical properties of Al–xMg alloys (x = 0, 1, 5–10 wt%), processed by ECAP at room temperature, have been investigated. The results show that the microstructures of Al–xMg alloys are ... -
EBSD undersøkelser og in situ strekktesting av stål i SEM
(Master thesis, 2012)Denne masteroppgaven har tatt for seg undersøkelser av stål designet for lavtemperaurappliksjoner ved bruk av elektronmikroskop i kombinasjon med diffraksjon av tilbakespredte elektroner (Electron Backscatter Diffraction ... -
Phase Transformation Study of X70 Steel by EBSD during In Situ Heating and Quenching
(Master thesis, 2012)Arctic steels, like the API X70 steel explored in this master thesis, are developed to withstand very low temperatures, with a ductile/brittle transition temperature below −60◦C. However, during welding, brittle phases ...