Diffusion coefficients were measured in alloy steels, at temperatures of between 370 and 620C, by using the time-lag method. It was found that alloying decreased the diffusion coefficient (tables 78 and 79).
O.F.Angeles, R.J.Stueber, G.H.Geiger: Corrosion, 1976, 32[5], 179-83
Table 75
Diffusion Coefficient, DAlCrFe, for the Fe-Cr-Al System
Al (at%) | Cr (at%) | Value (cm2/s) |
11.34 | 40.16 | 5.0 x 10-12 |
11.43 | 39.56 | 2.0 x 10-12 |
11.88 | 36.72 | 6.0 x 10-12 |
14.72 | 23.58 | 3.0 x 10-11 |
14.95 | 22.75 | 4.9 x 10-11 |
15.96 | 19.07 | 4.8 x 10-11 |
16.17 | 18.32 | 9.4 x 10-11 |
continued
Table 75 (continued)
Diffusion Coefficient, DAlCrFe, for the Fe-Cr-Al System
Al (at%) | Cr (at%) | Value (cm2/s) |
17.56 | 13.50 | 5.4 x 10-11 |
18.75 | 8.90 | 9.6 x 10-11 |
22.07 | 17.38 | -1.07 x 10-10 |
22.77 | 21.15 | -2.0 x 10-12 |
24.12 | 11.96 | -1.13 x 10-10 |
24.83 | 16.49 | 6.5 x 10-11 |
27.34 | 10.83 | -1.29 x 10-10 |
28.40 | 6.56 | 6.4 x 10-11 |
29.59 | 17.19 | -1.0 x 10-12 |
33.55 | 10.70 | -3.5 x 10-11 |
34.53 | 3.63 | 2.03 x 10-10 |
38.03 | 5.02 | -4.0 x 10-11 |
39.20 | 1.27 | 6.0 x 10-11 |
39.25 | 1.33 | -2.4 x 10-11 |
39.54 | 8.22 | 4.0 x 10-11 |
39.68 | 6.02 | 3.9 x 10-11 |
39.79 | 3.10 | 2.6 x 10-11 |
39.80 | 3.14 | 3.0 x 10-11 |
39.84 | 4.37 | 2.3 x 10-11 |
45.66 | 4.09 | -6.3 x 10-11 |
45.87 | 3.47 | -7.1 x 10-11 |
46.17 | 2.51 | -7.0 x 10-11 |
46.33 | 1.89 | 8.2 x 10-11 |