Search for dissertations about: "Ni-base alloys"

Showing result 1 - 5 of 12 swedish dissertations containing the words Ni-base alloys.

2. 1. High Temperature Corrosion Behaviour of Ni-base Alloys and FeCrAl Alloys – The Influence of Water Vapour

   Author : Tommy Sand; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cr-evaporation; FeCrAl alloy; Oxidation; Chromia scale; Alumina scale; High-temperature corrosion; Ni-base alloy;

   Abstract : Electricity production, transportation, and manufacturing industry are some of the largest sources of greenhouse gas emissions. In many cases, these processes are carried out at high temperature and energy efficiency is limited by material degradation, so-called ‘high-temperature corrosion’. READ MORE

4. 2. Microstructural evolution during hot compression of a Ni-base superalloy: Dynamic and post-dynamic recrystallization below the secondary carbide solvus temperature

   Author : Emil Eriksson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hot compression; Ni-base superalloys; Electron microscopy; Recrystallization;

   Abstract : With an increased demand to lower emissions, the eciency of aircraft engines have to be improved. One way to achieve this is to increase the operation temperature. However, due to the extremely challenging environments in the hot sections of these engines, the current alloys are at their limits. READ MORE

5. 3. Oxygen Induced High Temperature Crack Growth in Ni-base Superalloys

   Author : Leif Viskari; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Diffusion; Environmental influence; Crack growth; Atom probe tomography; Electron Microscopy; Deformation; Crack tip oxidation; Hold-time fatigue;

   Abstract : Oxygen induced crack growth is a serious concern for the performance of Ni-base superalloys. These alloys are used in gas-turbine engines where they are exposed to hightemperatures, mechanical loads and oxygen-rich environments. READ MORE

6. 4. Mechanisms of Metal Dusting

   Author : Peter Szakálos; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; metal dusting; mechanism; driving force; kinetics; high temperature corrosion; carburization; stainlesssteel; Ni-base alloys; iron; alumina formers; FeCrAl; oxidation; carbon nanotubes; discontinuous precipitation; Materials science; Teknisk materialvetenskap;

   Abstract : The primary intention with this Doctoral thesis is to fillin the knowledge gaps and raise the level of understandingregarding the different metal dusting mechanisms in general andexplain the process in detail for high alloyed materials.Considerable effort is put into identifying the driving forcesand elucidating the diffusional processes in metal dusting. READ MORE

7. 5. High temperature corrosion of some selected stainless steels and Ni-base alloys – an advanced microscopy study

   Author : Nooshin Mortazavi Seyedeh; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; oxidation; KCl; STEM; high-temperature materials; STEM EDX; TKD.;

   Abstract : The thesis deals with high temperature corrosion behavior of some selective stainless steels and Ni-base alloys with applications in power generation technologies, e.g. boilers fired by biomass and waste. READ MORE