Sökning: "Nickel-based superalloy"

Visar resultat 11 - 15 av 29 avhandlingar innehållade orden Nickel-based superalloy.

1. 11. Detection and classification of internal flaws in laser powder bed fusion: application of in-situ monitoring for quality control of Hastelloy X builds

   Författare :Claudia de Andrade Schwerz; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; melt pool; productivity; flaw detection; nickel-based superalloy; powder bed fusion; lack of fusion; spatter; defects; Additive manufacturing; process monitoring; pores;

   Sammanfattning : Additive manufacturing technologies, in particular laser powder bed fusion (LPBF), have received much attention in recent years due to their multiple advantages over traditional manufacturing. Yet, the usage of additively manufactured products is still quite limited, mainly due to two factors: the low repeatability, which is particularly relevant for applications where high performance is required from the materials, and the typically low productivity, particularly relevant for products with a substantial production volume. LÄS MER

3. 12. 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

4. 13. Weld Cracking in Precipitation Hardening Ni-based Superalloys

   Författare :Fabian Hanning; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; welding; post weld heat treatment; weldability; Nickel based superalloys; strain age cracking; weld cracking;

   Sammanfattning : Manufacturing of hot structural components for aero engines requires the materials being used to be weldable. The high demands on strength and temperature resistance make nickel based superalloys the material of choice for this application. LÄS MER

5. 14. Aluminide Diffusion Coatings for Ni Based Superalloys. Coating and Oxide Microstructure

   Författare :Johan Angenete; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; microstructure; aluminide diffusion coatings; nickel based superalloys; SEM; TEM; high temperature oxidation;

   Sammanfattning : This thesis reports on investigations of high temperature oxidation resistant aluminide diffusion coatings for Ni based superalloys. Such coatings basically consist of a .BETA.-NiAl layer at the surface of the . LÄS MER

7. 15. Method Development for Characterisation of Superalloy used in Containment Design

   Författare :Ted Sjöberg; Mats Oldenburg; Jörgen Kajberg; Odd Geir Lademo; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

   Sammanfattning : Due to the trend of increasing environmental demands put on civil aviation, manufacturersof commercial aircraft engines meet increased pressure to reduce weight. Modernturbofan engines represent up to almost one tenth of an aircraft's total weight, meaning areduction of engine component weight of just 30 kg is estimated to reduce CO2 emissionsby 400 tonnes over the lifetime of a medium sized commercial aircraft. LÄS MER