The diffusion of 59Fe in fine-grained Mo-stabilized stainless steel was studied at 1178 to 1483K. The near-surface regions of the concentration/penetration curves were analyzed in order to obtain lattice diffusion data, while grain boundary diffusion data were obtained from regions situated far from the initial interface. It was found that the lattice diffusivity could be described by:

D (m2/s) = 1.18 x 10-6 exp[-228.5(kJ/mol)/RT]

and that the grain boundary diffusivity could be described by:

D (m2/s) = 6.10 x 10-4 exp[-177.2(kJ/mol)/RT]

R.V.Patil, B.D.Sharma: Metal Science, 1982, 16[8], 389-92