Modelling precipitation sequences in power plant steels Part 1 – Kinetic theory

Authors:
  • JRJ. D. Robson
    J. D. Robson
  • HBH. K. D. H. Bhadeshia
    H. K. D. H. Bhadeshia
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Abstract
The ability of steels to resist creep deformation depends on the presence in the microstructure of carbides and intermetallic compounds which precipitate during tempering or during elevated temperature service. The precipitation occurs in a sequence which leads towards thermodynamic equilibrium. The present paper deals with an extension of the Johnson-Mehl-Avrami theory for overall transformation kinetics. The modification permits the treatment of more than one precipitation reaction occurring simultaneously, afeature which isfound to be essential for representing the reactions observed experimentally in a wide range of secondary hardening steels.