Sökning: "Fe-C"

Visar resultat 1 - 5 av 20 avhandlingar innehållade ordet Fe-C.

  1. 1. Study of precipitation in martensitic Fe-C-Cr alloys during tempering : Experiments and modelling

    Författare :Ziyong Hou; Joakim Odqvist; Andersson Jörgen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fe-C-Cr alloy; Microstructure; Precipitates; Tempering of martensite; Electron microscopy; Modelling.; Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : Understanding the precipitation reaction is very important since precipitation hardening is one of the most effective strengthening mechanisms in metallic alloys. In martensitic steels, a tempering heat treatment is often performed. LÄS MER

  3. 2. Thermodynamic description of the Fe-C-Cr-Mn-Ni-O system

    Författare :Lina Kjellqvist; Malin Selleby; Bengt Hallstedt; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; thermodynamic modelling; thermodynamic assessment; Calphad; phase diagram; spinel; compound energy formalism; ionic two-sublattice liquid model; Materials science; Teknisk materialvetenskap;

    Sammanfattning : The Fe-C-Cr-Mn-Ni-O system is of fundamental importance when describing the influence of oxygen on high alloyed steels. Both solid and liquid phases are of great interest: The solid phases regarding oxidation processes like the formation of oxide layers, inner oxidation, sintering processes and high temperature corrosion. LÄS MER

  4. 3. Formation of Bainite in Steels

    Författare :Jiaqing Yin; Annika Borgenstam; Bevis Hutchinson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fe-C alloys; Bainitic transformation; Proeutectoid ferrite; Upper bainite; Lower bainite; Morphology; Steels.; Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : A systematic survey of morphology of bainite and proeutectoid ferrite was carried out in order to validate some old thoughts of bainite transformation mechanism. It is confirmed that there is no morphological evidence supporting a sharp change neither between Widmanstätten ferrite and the ferritic component of upper bainite, nor between upper and lower bainite. LÄS MER

  5. 4. An experimental and theoretical study of precipitation during tempering of martensite in Fe-C-Cr alloys

    Författare :Ziyong Hou; Joakim Odqvist; Jörgen Andersson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : .... LÄS MER

  7. 5. Formation of Bainite Studied by In-situ High-energy X-ray Diffraction

    Författare :Sen Lin; Peter Hedström; Annika Borgenstam; Sébastien Allain; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Steel; Bainitic transformation; High-energy X-ray diffraction; Electron microscopy; Carbon diffusion; Thermodynamics and kinetics; Microstructure evolution; 高强钢; 贝氏体转变; 原位高能X射线衍射; 扫描与透射电子显微镜; 碳扩散; 热力学与动力学; 微观结构表征; Stål; Bainitiska fasomvandlingen; Högenergi-röntgendiffraktion; Elektronmikroskopi; Koldiffusion; Termodynamik och kinetik; Mikrostrukturutveckling; Materials Science and Engineering; Teknisk materialvetenskap;

    Sammanfattning :       Bainitic steels have attracted great attentions in recent years due to their excellent combination of properties to accommodate a wide range of applications. A deep and comprehensive understanding of how bainite forms is required to better design the production process and optimize the properties of bainitic steels. LÄS MER