Sökning: "Phase transformations"

Visar resultat 21 - 25 av 129 avhandlingar innehållade orden Phase transformations.

  1. 21. Modelling of cyclic and viscous behaviour of thermomechanically loaded pearlitic steels; Application to tread braked railway wheels

    Författare :Ali Esmaeili; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rolling contact fatigue; plasticity; tread braking; full-scale brake rig testing; Railway wheels; finite element analyses; pearlitic steel; viscoplasticity; ratchetting; phase transformations;

    Sammanfattning : In service, railway wheel and rail materials are subjected to high stresses and, in some cases, elevated temperatures. The high stresses are caused by the rolling contact between wheel and rail. Furthermore, heat generated from tread braking and/or sliding between wheel and rail gives additional stress due to constrained thermal expansion. LÄS MER

  3. 22. Institutions, Inequality and Societal Transformations

    Författare :Sara Moricz; Nationalekonomiska institutionen; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Gender Norms; Metoo; Sweden; LSTM Neural Network; Asia; Indonesia; Democracy; Elections; Economic Growth; Income Inequality; Economic Development;

    Sammanfattning : Institutions matter for economic development. This thesis consists of three self-contained articles which provide different contributions to institutional economics.The first article studies short-run changes in gender norms. It takes advantage of recent developments in machine learning algorithms to study changes in norms in Swedish tweets. LÄS MER

  4. 23. Structure and mechanical properties of dual phase steels : An experimental and theoretical analysis

    Författare :Ylva Granbom; John Ågren; Ir Bruno C. De Cooman; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Dual phase steels; continuous annealing; dilatometry; microstructure; mechanical properties; process parameters; dislocation model; plastic deformation; Metallurgical process and manufacturing engineering; Metallurgisk process- och produktionsteknik; Mikrostrukturutveckling i avancerade höghållfasta stål;

    Sammanfattning : The key to the understanding of the mechanical behavior of dual phase (DP) steels is to a large extent to be found in the microstructure. The microstructure is in its turn a result of the chemical composition and the process parameters during its production. LÄS MER

  5. 24. Deposition and Phase Transformations of Ternary Al-Cr-O Thin Films

    Författare :Ali Khatibi; Lars Hultman; Per Eklund; Jon Andersson; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Thin Films; Hard Coatings; Mathematical physics; Matematisk fysik;

    Sammanfattning : This thesis concerns the ternary Al-Cr-O system. (Al1-xCrx)2O3 solid solution thin films with 0.62 gas mixture. As-deposited and annealed (Al1-xCrx)2O3 thin films were analyzed by x-ray diffraction, elastic recoil detection analysis, scanning electron microscopy, transmission electron microscopy, and nanoindentation. LÄS MER

  7. 25. Extreme water catalyzed transformations of SiO2, TiO2 and LiAlSiO4

    Författare :Kristina Spektor; Ulrich Häussermann; Gunnar Svensson; Natalia Dubrovinskaia; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; extreme water environments; high pressure polymorphism; hydrous stishovite; titania phase transitions; lithium aluminosilicates; zeolites from glass precursors; hydrous pyroxenes; Materials Chemistry; materialkemi;

    Sammanfattning : The dramatic change in properties of water near its critical point (i.e. T = 374 °C and p = 22.1 MPa, note: 100 MPa = 0. LÄS MER