Sökning: "isothermal martensite"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden isothermal martensite.

  1. 1. Nucleation and growth of martensite in steel

    Detta är en avhandling från Stockholm : KTH

    Författare :Annika Borgenstam; [1997]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; martensite; Fe-alloys; α-martensite; athermal martensite; isothermal martensite; plate martensite; lath martensite; nucleation; growth; thermodynamics; plateau temperature; driving force; activation energy; bainite; Widmanstätten α; diffusive mechanism; displacive mechanism; ε-martensite; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : .... LÄS MER

  2. 2. Effect of heat treatment on microstructure and mechanical properties of a 5 wt.% Cr cold work tool steel

    Detta är en avhandling från Trollhättan : University West

    Författare :Arbab Rehan; Lars-Erik Svensson; Leif Karlsson; Anna Medvedeva; Per Erik Skogholm; Berne Högman; Reinhold Schneider; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cold work tool steel; Hardening; Tempering; Microstructural characterisation; Retained austenite; Martensite; Bainite; Hardness; Impact toughness; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik;

    Sammanfattning : This work presents investigations related to phase transformations occurring inthe 5 wt.% Cr cold work tool steel Caldie during hardening and tempering treatments. LÄS MER

  3. 3. Modeling Phase Transformations and Volume Changes during Cooling of Case Hardening Steels

    Detta är en avhandling från Stockholm : KTH

    Författare :Matilda Tehler; Stefan Jonsson; Åsa Gustafson; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Phase transformation; volume changes; TECHNOLOGY Materials science Other materials science; TEKNIKVETENSKAP Teknisk materialvetenskap Övrig teknisk materialvetenskap;

    Sammanfattning : Case hardening distortions are a major problem for gear manufacturers. The aim of the current work is to create a simulation model, able to predict how and when case hardening distortions arise. The results presented in this thesis form a basis for such a model.Two case hardening steels, with base carbon contents of 0. LÄS MER

  4. 4. Structure and properties of advanced fine grained steels produced using novel thermal treatments

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Esa Vuorinen; [2012]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering Materials; Materialteknik;

    Sammanfattning : Fine grained advanced steels exhibit favourable mechanical properties for applications requiring high strength, ductility and impact toughness. These properties result from a microstructure containing a fine distribution of several phases including ferrite, austenite, martensite and bainite. LÄS MER

  5. 5. Wear and fatigue properties of isothermally treated high-Si steels

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Alejandro Leiro; [2012]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering Materials; Materialteknik; Centre - Centre for High Performance Steel CHS ; Centrumbildning - Centrum för högpresterande stål CHS ;

    Sammanfattning : In recent years steels containing Si contents of 1,5% or more have been isothermally transformed in order to obtain a microstructure consisting of bainitic ferrite laths and retained austenite. The refined microstructure and presence of retained austenite has allowed the manufacture of steels with high tensile strength and considerable elongation. LÄS MER