The diffusion of 14C in the ferrite phase of the 9.8Co-5.7W-0.9wt%C alloy steel was studied by using a radio-isotope method. The results for 590 to 710C could be described by:
D (cm2/s) = 8.9 x 102 exp[-46.5(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 56
Bulk Diffusivity of 51Cr in Fe-Cr Alloys
Temperature (K) | AlloyMethod | D (m2/s) |
1043 | 1R | 2.56 x 10-16 |
1043 | 1S | 2.59 x 10-16 |
983 | 1R | 1.60 x 10-17 |
983 | 1S | 4.07 x 10-18 |
923 | 1R | 3.04 x 10-19 |
923 | 2R | 1.51 x 10-19 |
923 | 3R | 2.92 x 10-19 |
923 | 1S | 2.10 x 10-19 |
923 | 2S | 1.86 x 10-19 |
923 | 3S | 2.34 x 10-19 |
863 | 1R | 9.84 x 10-20 |
863 | 2R | 6.36 x 10-20 |
863 | 3R | 6.19 x 10-20 |
863 | 1S | 1.07 x 10-19 |
863 | 2S | 8.05 x 10-20 |
863 | 3S | 5.69 x 10-20 |
Table 57
Grain Boundary Diffusivity of 51Cr in Fe-Cr Alloys
Temperature (K) | AlloyMethod | D (m3/s) |
1043 | 1R | 3.70 x 10-21 |
1043 | 1S | 5.07 x 10-21 |
983 | 1R | 5.73 x 10-22 |
983 | 2R | 2.00 x 10-22 |
983 | 3R | 5.97 x 10-23 |
983 | 2S | 2.04 x 10-22 |
983 | 3S | 6.75 x 10-23 |
983 | 1S | 8.73 x 10-22 |
923 | 3R | 6.49 x 10-24 |
923 | 3S | 7.20 x 10-24 |
923 | 1R | 1.90 x 10-23 |
923 | 2R | 4.14 x 10-23 |
923 | 1S | 2.68 x 10-23 |
923 | 2S | 4.17 x 10-23 |
863 | 3R | 2.47 x 10-25 |
863 | 3S | 3.17 x 10-25 |
803 | 1R | 9.05 x 10-26 |
803 | 2R | 5.07 x 10-25 |
803 | 3R | 2.35 x 10-26 |
743 | 1R | 4.49 x 10-26 |
743 | 2R | 4.32 x 10-26 |
743 | 3R | 3.79 x 10-27 |
743 | 1S | 4.46 x 10-26 |
743 | 2S | 4.32 x 10-26 |
743 | 3S | 4.81 x 10-27 |