Diffusivity was studied in a 2.25Cr-1wt%Mo ferritic steel which was Nb-stabilized and contained small amounts of Ni. The measurements were performed at temperatures ranging from 475 to 600C, or at 800C, for Sb and Si, respectively. The experiments involved the annealing of the steel in the powdered diffusant, or the annealing of steel specimens onto which the diffusant had been deposited. These methods were here called bulk and thin-film, respectively (table 64). The results showed that the diffusivity of Si in this steel was different to the diffusivity of Si in -Fe. The diffusivity of Sb in the steel was much higher than that in -Fe at lower temperatures. The difference in diffusivity was attributed to differences in the Sb concentration.

M.Ahmad, K.A.Shoaib, M.A.Shaikh, K.Ehrlich: Journal of Materials Science Letters, 1995, 14[8], 577-9

Table 64

Diffusivity of Sb and Si in Fe-Cr-Mo (DIN 1.6770)