Dilute alloys which contained up to 0.6wt%Nb were prepared. Diffusion couples between these alloys, and pure Fe, were prepared by spot-welding. After vacuum annealing, the diffusion profiles were determined by using electron probe microanalysis. In austenite, the interdiffusion of Nb was in good agreement with previous tracer diffusion data. At between 1147 and 1347C, the Nb diffusivity in an 0.58%Nb alloy could be described by:

D (mm2/s) = 6.17 x 102 exp[-293000)/RT]

Q.A.Shaikh: Materials Science and Technology, 1990, 6[12], 1177-80