Sökning: "hardening mechanisms"

Visar resultat 16 - 20 av 59 avhandlingar innehållade orden hardening mechanisms.

  1. 16. Creep modelling of particle strengthened steels

    Författare :Hans Magnusson; Rolf Sandström; Göran Engberg; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Particle strengthening; dislocation climb; ferritic steels; dislocation evolution; creep rate modelling; Materials science; Teknisk materialvetenskap;

    Sammanfattning : Materials to be used in thermal power plants have to resist creep deformation for time periods up to 30 years. The role of alloying elements for creep strength of 9-12% Cr steels is analysed. The creep strength in these steels relies on minor additions of alloying elements. LÄS MER

  3. 17. Isothermal and Thermal Fatigue of Martensitic Chromium Hot-Work Tool Steels

    Författare :Johnny Sjöström; []
    Nyckelord :;

    Sammanfattning : A lot of our everyday products, e.g. car-parts and mobile phone covers, are shaped by using high temperature techniques, such as die casting, extrusion, forging or rolling. The die in all these forming processes play an important role, since it usually gives the object its final shape. LÄS MER

  4. 18. Properties of Modern Rendering Systems based on Mineral Binders

    Författare :Carl-Magnus Capener; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; polymers; mortar; rendering; properties; microstructure; admixtures; chemistry;

    Sammanfattning : Composite mineral–organic materials and in particular cement-organic materials are increasingly used in today’s construction applications and civil engineering projects. Polymer-modified render is a material that possesses several properties superior to conventional renders, such as better workability, crack resistance, adhesion to substrate and flexural strength. LÄS MER

  5. 19. Microstructure and property models of alloy 718 applicable for simulation of manufacturing processes

    Författare :Marie Anna Moretti; Lars-Erik Lindgren; Paul Åkerström; Jörgen Kajberg; Bijish Babu; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material characterisation; Material modelling; Alloy 718; Plasticity; Recrystallization; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : This thesis focuses on experimental characterization, understanding and modelling of nickel-based alloy 718, for a large range of loading conditions. Alloy 718 is the most widely used nickel-based superalloy, due to its high strength, high corrosion resistance and excellent mechanical properties at high temperatures. LÄS MER

  7. 20. Fatigue behaviour of a nickel based superalloy

    Författare :Henrik Andersson; Materialteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; materialteknik; Materiallära; Material technology; Bodner-Partom; Fatigue; High temperature;

    Sammanfattning : This thesis deals with different aspects of fatigue crack propagation in IN718. The ultimate objective of the work is to gain understanding of the fatigue process, from the macroscopic stress-strain relations to microscopic fatigue crack growth mechanisms. LÄS MER