Calculation of γ-α Nuclear Driving Forces and Critical Nucleus Compositions of Alloy Steel

On the basis of Wagner's kinetic model, the compositions of critical nucleus and the nuclear driving forces of the precipitation of preutectoid ferrite in the conditions of equilibrium and para-equilibrium for polynary low-alloy steels, containing Mn, Si, Ni, Cr, Mo, Cu, V, Nb, W and Co (the total content<7%), were calculated. A pratical calculated programme was established.