Search for dissertations about: "transformation kinetics"

Showing result 1 - 5 of 57 swedish dissertations containing the words transformation kinetics.

  2. 1. Transformation phenomena in a super duplex stainless steel

    Author : Anders Wilson; KTH; []
    Keywords : Duplex stainless steel; Microstructure; Phase transformations; Precipitates; Sigma phase; Kinetics; Thermodynamic calculation; Continuous cooling transformation diagram; Time temperature transformation diagram; Computer model.;

    Abstract : Duplex stainless steels consist of about equal fractions offerrite and austenite and are attractive due to their highcorrosion resistance against pitting corrosion and stresscorrosion cracking. The pitting corrosion resistance can bedescribed by the PREN value which is defined asPREN=%Cr+3.3*%Mo+16*%N. READ MORE

  4. 2. Micro-mechanical FE-simulations of the plastic behaviour of steels undergoing martensitic transformation

    Author : Kjell Simonsson; Sören Sjöström; Marcel Berveiller; Linköpings universitet; []
    Keywords : Steel; martensitic transformation; grain constitution; finite element simulations; plastic behaviour; transformation kinetics; TECHNOLOGY; TEKNIKVETENSKAP;

    Abstract : This thesis is concerned with the mechanical behaviour of steels undergoing martensitic transformation. More specifically, the aim has been to develop a method to numerically stimulate the mean strain (or stress) response associated with a prescribed temperature and mean stress (or strain) variation. READ MORE

  5. 3. Structural, Kinetic and Thermodynamic Aspects of the Crystal Polymorphism of Substituted Monocyclic Aromatic Compounds

    Author : Michael Svärd; Åke Rasmuson; Hugo Meekes; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polymorphism; crystallization; thermodynamics; kinetics; nucleation; crystallography; solubility; phase equilibria; polymorphic transformation; solution history; metastable zone; classical theory of nucleation; two-step theory of nucleation; cluster; crystal structure prediction; lattice energy; molecular mechanics; force field; electrostatic potential; potential energy hypersurface; m-aminobenzoic acid; m-hydroxybenzoic acid; Chemical engineering; Kemiteknik;

    Abstract : This work concerns the interrelationship between thermodynamic, kinetic and structural aspects of crystal polymorphism. It is both experimental and theoretical, and limited with respect to compounds to substituted monocyclic aromatics. READ MORE

  6. 4. Process modeling of semibatch reaction crystallization

    Author : Marie Ståhl; Åke Rasmuson; Hermann J.M. Kramer; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Reaction crystallization; benzoic acid; nucleation; growth; kinetics; growth rate dispersion; Chemical physics; Kemisk fysik;

    Abstract : This thesis aims at increasing the fundamental understanding of reaction crystallization by modeling, simulations and parameter estimation. Benzoic acid is used as the model compound. READ MORE

  7. 5. Synthesis of nano sized Cu and Cu-W alloy by hydrogen reduction

    Author : Ulrika Tilliander; Seshadri Seetharaman; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydrogen reduction; kinetics; activation energy; copper oxide; copper tungsten composite; alloy powder; manostructure; Other materials science; Övrig teknisk materialvetenskap;

    Abstract : The major part of the present work, deals with the reduction kinetics of Cu2O powder and a Cu2O-WO3 powder mixture by hydrogen gas, studied by ThermoGravimetric Analysis (TGA). The reduction experiments were carried out both isothermally and non-isothermally on thin powder beds over different temperature intervals. READ MORE