Search for dissertations about: "Nickel superalloys"

Showing result 1 - 5 of 51 swedish dissertations containing the words Nickel superalloys.

2. 1. Microstructure of Nickel-Chromium Superalloys

   Author : Mattias Thuvander; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; segregation; TEM; nickel alloy; grain boundary; APFIM; SIMS; carbide; precipitation; ordering; boride;

   Abstract : The microstructure of nickel-chromium superalloys has been investigated using several advanced microanalytical techniques; atom probe field ion microscopy (APFIM), transmission electron microscopy (TEM) together with energy dispersive X-ray analysis (EDX) and electron energy loss spectroscopy (EELS), secondary ion mass spectroscopy (SIMS) and optical microscopy (OM). The features primarily considered include precipitation, segregation and ordering. READ MORE

4. 2. Nickel-Based Single-Crystal Superalloys : the crystal orientation influence on high temperature properties

   Author : Mikael Segersäll; Johan Moverare; Kjell Simonsson; Daniel Leidermark; Roger Reed; Linköpings universitet; []
   Keywords : ;

   Abstract : Superalloys are a group of materials that are used in high temperature applications, for example gas turbines and aero engines. Gas turbines are most commonly used for power generation, and it is only the very critical components which are exposed to the most severe conditions within the turbine, which are made from superalloy material. READ MORE

5. 3. Hot Cracking and Grain Boundary Weaknesses of Nickel - Based Superalloys

   Author : Joel Håkan Andersson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hot cracks; Notch rupture testing; Eutectic; Weldability; Varestraint testing; Grain boundary weaknesses; Superalloys;

   Abstract : Abstract Grain boundary weaknesses of nickel-based superalloys not only materialize during service in the hot turbine engine sections but also during the weld manufacturing. The performance, in this respect, of the most commonly used alloys at Volvo Aero Corporation (VAC), 718 and the higher temperature capacity Waspaloy, are therefore the main subjects for this thesis. READ MORE

6. 4. Characterisation of Nickel-Based Superalloys Manufactued by Electron Beam Melting

   Author : Annika Strondl; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEM; electron beam melting; APFIM; EBSD; XRD; DTA; nickel-based superalloys; SEM; additive manufacturing; EDS;

   Abstract : Nickel-based superalloys have been manufactured by electron beam melting (EBM). EBM is an additive manufacturing process for direct production of metal parts. The part is build up by successive melting of metal powder layers in a vacuum chamber using electron beam. READ MORE

7. 5. Cracks in superalloys

   Author : Jonas Saarimäki; Johan Moverare; Kjell Simonsson; Magnus Hörnqvist Colliander; Robert Eriksson; Håkan Brodin; Mark Whitaker; Linköpings universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Abstract : Gas turbines are widely used in industry for power generation and as a power source at hard to reach locations where other possibilities for electrical power supplies are insufficient. New ways of producing greener energy is needed to reduce emission levels. This can be achieved by increasing the combustion temperature of gas turbines. READ MORE