THE INFLUENCE OF DIFFUSION OF CARBON IN FERRITE AS WELL AS IN AUSTENITE ON A MODEL OF REAUSTENITIZATION FROM FERRITE CEMENTITE MIXTURES IN FE-C STEELS/

The kinetics of formation of austenite from ferrite and cementite mixt ures has been modelled by assuming the local equilibrium at the planar phase interfaces, The exact solutions to the diffusion equations gove rning the volume diffusion of carbon in austenite and ferrite are pres ented. The concurrent motions of the two interfaces are calculated via solving a set of transcendental equations derived from the flux balan ce conditions. At low isothermal transformation temperatures, it is fo und that the time required for reaustenitization is slightly greater t han the time previously calculated with no diffusion of carbon in ferr ite.