The migration of Fe in alloys which contained a few ppm of S was studied at 916 to 1050C. The data could be described by:

0.00105wt%S (Fisher method):     D (cm2/s) = 7.6 x 10-9 exp[-148(kJ/mol)/RT]

0.00105wt%S (Suzuoka method):     D (cm2/s) = 3.0 x 10-8 exp[-155(kJ/mol)/RT]

0.00355wt%S (Fisher method):     D (cm2/s) = 1.24 x 10-6 exp[-214(kJ/mol)/RT]

0.00355wt%S (Suzuoka method):     D (cm2/s) = 2.1 x 10-6 exp[-211(kJ/mol)/RT]

The results demonstrated that the presence of S led to a decrease in the grain boundary diffusivity of Fe.

D.Treheux: Scripta Metallurgica, 1983, 17[7], 933-6