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Theory of Pearlite Reaction

Theory of the Pearlite Reaction
J.W. Cahn and W.C. Hagel

Factors influencing the kinetics of the pearlite reaction are discussed in terms of overall rate equations for randomly distributed and grain-boundary nuclei, site saturation and time-dependent nucleation rate, and growth dependence on volume and interface diffusion. A three-component thermodynamic treatment has been developed to provide the limiting effects of an alloy element on phase equilibria above and below the temperature where partitioning must occur. Criteria for distinguishing the rate-determining process from kinetic and equilibrium measurements are established. Many earlier theoretical assumptions remain unverified, and good experimental data are rarely complete. It is believed that the growth of pearlite, in commercial plain-carbon steels, only fortuitously appears to be controlled by carbon diffusion in austenite. Alloy additions may exercise their control by enforcing partitioning at higher temperatures and by decreasing or increasing interface diffusion and interface mobility.

Publisher: TMS
Product Format: PDF
Pages: 127-198
Date Published: September 1, 1998
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