The diffusion of 14C in the ferrite phase of the alloy steel was studied by using a radio-isotope method. The results for 590 to 710C could be described by:

Fe-9.2Co-3.7Cr-0.82wt%C:     D (cm2/s) = 2.9 x 100 exp[-35.6(kcal/mol)/RT]

Fe-9.2Co-3.9Cr-0.91wt%C:     D (cm2/s) = 5.9 x 100 exp[-38.8(kcal/mol)/RT]

The diffusion parameters depended upon whether or not allowance was made for the carbide phase.

I.K.Kupalova, S.V.Zemskii: Izvestia Akademii Nauk, 1974, 4, 123-5

 

Table 54

Diffusion of Au in Fe70Co15B15

 

Temperature (K)

D (m2/s)

511

8.38 x 10-25

530

2.59 x 10-24

534

1.29 x 10-24

570

6.25 x 10-23

580

8.00 x 10-23

600

8.61 x 10-23