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Visar resultat 1 - 5 av 6 avhandlingar som matchar ovanstående sökkriterier.

1. 1. High temperature performance of materials for future power plants

   Författare :Junjing He; Pavel Korzhavyi; Rolf Sandström; Stefano Spigarelli; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Austenitic stainless steels; Nickel based superalloys; Low cycle fatigue; Creep-fatigue; Creep cavitation; Grain boundary sliding; Cavity nucleation; Cavity growth; Creep rupture strength; Advanced ultra-supercritical power plants.; Teknisk materialvetenskap; Materials Science and Engineering;

   Sammanfattning : Increasing energy demand leads to two crucial problems for the whole society. One is the economic cost and the other is the pollution of the environment, especially CO2 emissions. Despite efforts to adopt renewable energy sources, fossil fuels will continue to dominate. LÄS MER

3. 2. Failure mechanisms in continuous fiber systems

   Författare :Jonas Neumeister; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; volume dependence; representative volume element; stress recovery; creep rupture; fiber fragmentation; tensile and flexural strength; brittle matrix composite; damage; fiber bundle; bundle pullout; failure propagation time; incubation time;

   Sammanfattning : .... LÄS MER

4. 3. High-performance Nickel-based Superalloys for Additive Manufacturing

   Författare :Jinghao Xu; Johan Moverare; Ru Peng; Chinnapat Panwisawas; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nickel-based superalloy; Alloy design; Laser powder bed fusion; Cracking susceptibility; Additive manufacturability; Heat treatment; γ′ precipitate; High-temperature mechanical property; Creep; Oxidation;

   Sammanfattning : Additive manufacturing (AM), e.g., laser powder bed fusion (LPBF) technique, has become a powerful manufacturing process for producing metallic components with the advantages of design freedom, net-shape-forming flexibility, product customization, and reduced lead time to market. LÄS MER

5. 4. Fundamental models and testing of creep in copper

   Författare :Fangfei Sui; Pavel A. Korzhavyi; Rolf Sandström; Alan Cocks; KTH; []
   Nyckelord :Copper; Creep tests; Multiaxial stress state; Finite element method; Basic modelling; Tertiary creep; Precipitation hardening;

   Sammanfattning : Many sustainable technologies for energy production, for example, generation IV nuclear system, demand the use of materials operating at elevated temperatures for long duration of up to 60 years. Requirements that are even more stringent are found for creep exposed copper canisters for disposal of spent nuclear waste. LÄS MER

7. 5. Strengthening and degradation mechanisms in austenitic stainless steels at elevated temperature

   Författare :Muhammad Farooq; Rolf Sandström; Göran Engberg; KTH; []
   Nyckelord :;

   Sammanfattning : With rapid economic developments and rising living standards, the demand for electricity all over the world is greatly increased. Due to high fuel costs, the steam boilers with higher steam temperature and pressure are needed to decrease the cost of power generation throughout the world extensively. LÄS MER