Sökning: "Bainite"

Visar resultat 1 - 5 av 25 avhandlingar innehållade ordet Bainite.

  1. 1. 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

  3. 2. Does Bainite form with or without diffusion? : The experimental and theoretical evidence

    Författare :Peter Kolmskog; Annika Borgenstam; John Ågren; Bevis Hutchinson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Carbon steels; Bainite; Bainitic ferrite; Widmanstätten ferrite; Microstructure; Microscopy; Thermodynamic modeling;

    Sammanfattning : With the increased interest in bainitic steels, fundamental understanding of the bainite transformationis of major importance. Unfortunately, the research on bainite has been hampered by an oldcontroversy on its formation mechanism. Over the years two quite different theories have developedclaiming to describe the bainite transformation i.e. LÄS MER

  4. 3. Effect of Microstructure on Mechanical Properties of High Strength Steel Weld Metalsn

    Författare :Enda Keehan; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; strength; bainite; carbon; TEM; dilatometry; microstructure; impact toughness; neural network modelling; martensite; manganese; FEGSEM; nickel;

    Sammanfattning : The effects of variations in alloying content on the microstructure and mechanical properties of high strength steel weld metals have been studied. Based on neural network modelling, weld metals were produced using shielded metal arc welding with nickel at 7 or 9 wt. %, manganese at 2 or 0.5 wt. LÄS MER

  5. 4. Thermal Stability and Mechanical Properties of Bainitic Steel

    Författare :Adam Ståhlkrantz; Annika Borgenstam; Peter Hedström; Niklas Sarius; Joacim Hagström; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Bainite; Austempering; Low alloyed steel; Tempering; Variant pairing; Material characterization; Metallurgical process science; Metallurgisk processvetenskap; Materials Science and Engineering; Teknisk materialvetenskap;

    Sammanfattning : For material design it is important to understand and establish the relations between the processing of the steel, the resulting microstructure and how that correlate to the properties of the steel. The main focus of this thesis has been to increase this knowledge for low alloy bainitic steels with medium to high carbon content. LÄS MER

  7. 5. Modeling Bainite Formation in Steels

    Författare :Lindsay Leach; Annika Borgenstam; John Ågren; Lars Höglund; Hatem Zurob; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This study examines the fundamental aspects of bainite formation in a guided effort to lay a foundation for development of a model capable of predicting bainite formation. In the first part of this study, the tenets of an existing model for growth, developed by Zener and later modified by Hillert are examined. LÄS MER