Search for dissertations about: "VN precipitates"
Showing result 1 - 5 of 6 swedish dissertations containing the words VN precipitates.
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1. Aspects of microstructural evolution in chromium steels in high temperature applications
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
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2. Precipitate stability in creep resistant 9-12% chromium steels
Abstract : 9-12% chromium steels are used extensively in modern steam power plants at service temperatures up to 600°C. These materials are subjected to creep deformation during exposure which is the limiting factor in increasing the steam temperature and thus the thermal efficiency of the plants. READ MORE
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3. Precipitation Reactions at High Temperatures in 9-12% Chromium Steels
Abstract : This thesis reports on quantitative investigations of microstructural changes, mainly precipitation reactions, occurring during heat treatment, ageing and creep of 9-12% chromium steels. Several alloys with varying composition have been investigated. READ MORE
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4. Multiscale Modeling of Interfaces
Abstract : Understanding strength and stability of interfaces between dissimilar materials or phases is a highly active field of contemporary materials research. Knowledge of interface structure and energetics is important for modeling of complex materials both on a mechanical and thermodynamical level as well as for many functional properties. READ MORE
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5. Development of a new generation of creep resistant 12% chromium steels: Microstructure of Z-phase strengthened steels
Abstract : Fossil-fuel fired steam power plants provide more than 60% of the electricity generated worldwide, and account for about one third of the global CO2 emissions. Increasing the steam temperature and pressure leads to a higher thermal efficiency of the power plants and thus lower emissions. READ MORE