Sökning: "pearlite"

Visar resultat 1 - 5 av 28 avhandlingar innehållade ordet pearlite.

  1. 1. Computational Multiscale Modeling of Pearlitic Steel

    Författare :Erik Lindfeldt; Chalmers University of Technology; []
    Nyckelord :Multiscale modeling; homogenization; pearlite; crystal plasticity;

    Sammanfattning : The objective of this thesis is to investigate the possibilities to describe the mechanical behaviorof a pearlitic steel by using computational homogenization, or multiscale modeling. The proposed model contains three scales: the engineering macroscale, the mesoscale representing the colonies of the pearlite and the microscale containing the individual cementite lamellae and the ferrite matrix. LÄS MER

  2. 2. Influence of combined thermal and mechanical loadings on pearlitic steel microstructure in railway wheels and rails

    Författare :Dimitrios Nikas; Nikas Dimitrios; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; Wheel steels; EBSD; Spheroidisation; Low cycle fatigue LCF ; Rail steels; TEM; Multiaxial fatigue; Hardness; Pearlite; Thermal effects; Materials Science; Materialvetenskap;

    Sammanfattning : One of the most important aspects in railway operation is the interaction between rail and wheel. The contact patch between these two components is around the size of a small coin, and since high loads act on this small area, stresses will give rise to wear and damage in both components. LÄS MER

  3. 3. On multiscale modeling of pearlitic steel

    Författare :Erik Lindfeldt; Chalmers University of Technology; []
    Nyckelord :cementite; crystal plasticity; Pearlite; multiscale modeling; computational homogenization; digital image correlation; ferrite; in-situ SEM;

    Sammanfattning : By studying pearlitic steels using a scanning electron microscope it can be observed that pearlite is a two-phase material with cementite lamellae embedded in a matrix of ferrite. The cementite is commonly described as being stiff and brittle in comparison to the ferrite which is considered to have a soft and ductile mechanical behavior. LÄS MER

  4. 4. Thermal Conductivity of Cast Iron: Influences of Microstructure on the Thermal Conductivity of Cast Iron

    Författare :Daniel Holmgren; Chalmers University of Technology; []
    Nyckelord :EBSD; Laser Flash Technique; Modelling; Spheroidal Graphite; Lamellar Graphite; Primary Austenite; Compacted Graphite; Pearlite; Ferrite; Thermal Conductivity;

    Sammanfattning : The thermal transport properties of cast iron are important in high temperature applications,where the temperatures should be kept low and the thermal gradients within the componentsmall. Dimensional and microstructural changes, thermally induced stresses and even failuremight be catastrophic consequences of intense and/or unevenly distributed temperatures. LÄS MER

  5. 5. Effects on Machinability due to Microstructure Variations in Case Hardening Steel

    Författare :Karin Björkeborn; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Machinability; Short-term test; Microstructure; Pearlite Nodular Size; Case Hardening Steel; Chip breakability.;

    Sammanfattning : Typical products made of case hardening steel are transmission parts like gear wheels, pinions and crown wheels. Case hardening produces a carbon-rich surface and provides the parts with both enhanced hardness and fatigue life. LÄS MER