Application of thermodynamics and kinetics in the designing of new type TRIP steels concerning Al and P effects

    Volume 5, Issue 10 (November 2008)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 6 November 2008

    Page Count: 8


    Li, L.
    Shanghai University, Shanghai,

    Huang, S. G.
    Katholieke Universiteit Leuven, Heverlee,

    Wang, L.
    Technology Center Steel Products Institute, Baosteel,

    He, Y. L.
    Shanghai University, Shanghai,

    Vleugels, J.
    Katholieke Universiteit Leuven, Heverlee,

    Van der Biest, O.
    Katholieke Universiteit Leuven, Heverlee,

    (Received 3 April 2008; accepted 6 October 2008)

    Abstract

    The influence of C and Al content on phase transformation temperatures is investigated by dilatometric analysis. With the new set of experimental data, an updated thermodynamic description of the Fe-Al-C system is presented, using the thermodynamic data of the limiting binaries and the parameters for the Fe-Al-C ternary system optimized by some of the present authors. A well reproduced vertical section of the Fe-Mn-Si-Al-C system is also presented according to the thermodynamic description of the lower order systems. For the development of P containing transformation induced plasticity steel, the possibility of phosphorous segregating at grain boundary is discussed by thermodynamics as well as kinetics. Lower critical temperature is estimated for the steel to obtain the starting temperature of fast cooling. To understand the minimum rate of fast cooling, pearlite growth kinetics is calculated with self-developed diffusion coefficients of elements at the grain boundary. Over-aging temperature is tentatively determined through the calculation of T0 temperature by both equilibrium and para-equilibrium assumptions.


    Paper ID: JAI101765

    DOI: 10.1520/JAI101765

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    Title Application of thermodynamics and kinetics in the designing of new type TRIP steels concerning Al and P effects
    Symposium , 0000-00-00
    Committee A01