Steel Microstructure

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    Interpreting theMicrostructure of Steels

    www.msm.cam.ac.uk/phase-trans

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    austenite

    ferrite

    cementite

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    DISPLACIVE

    RECONSTRUCTIVE

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    Allotriomorpic

    Idiomorphic

    ferrite

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    Pearlite

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    20 m

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    Jaramillo et al., 2004

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    Ferrer et al., 2005

    Spheroidisation

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    Martensite

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    50 mm

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    c

    r

    s

    1

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    austenite

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    Chang and Bhadeshia

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    transformation twins (Wayman)

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    Bainite

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    1 m

    upperbainite

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    lowerbainite

    S f 1 S f 2

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    Surface 1 Surface 2

    Srinivasan & Wayman, 196850 m

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    DISPLACIVE

    RECONSTRUCTIVE

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    Widm nsttt n

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    Widmanstttenferrite

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    Watson and McDougall, 1973

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    More mixedmicrostructures

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    100 m

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    Peet, 2005

    Thermal etching

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    Thermal grooves,Chatterjee, 2005