The diffusivities of 181W in ferritic Fe-Cr and Fe-Cr-C alloys, and in 2 commercial 8%Cr ferritic steels, were determined by using serial sectioning methods at 743 to 1123K (table 71). The diffusivities along high-diffusivity paths were explained in terms of the basis of interactions of the diffusant with carbide particles.J.Čermák, J.Ruzicková, A.Pokorná: Acta Materialia, 1996, 44[12], 5007-19
Table 71
Grain Boundary Diffusion of 181W in Fe-Cr Alloys
Cr (wt%) | Temperature (K) | D (m3/s) |
8.07 | 1123 | 2.97 x 10-20 |
8.07 | 1063 | 5.00 x 10-21 |
8.07 | 1003 | 6.05 x 10-22 |
8.07 | 943 | 4.79 x 10-22 |
8.07 | 883 | 4.93 x 10-23 |
8.07 | 823 | 5.91 x 10-25 |
8.07 | 773 | 9.15 x 10-26 |
10.18 | 1123 | 3.29 x 10-20 |
10.18 | 1063 | 4.06 x 10-21 |
10.18 | 1003 | 6.21 x 10-22 |
10.18 | 943 | 3.55 x 10-22 |
10.18 | 883 | 5.05 x 10-23 |
10.18 | 823 | 3.95 x 10-25 |
10.18 | 773 | 2.52 x 10-26 |
12.25 | 1123 | 2.26 x 10-20 |
12.25 | 1063 | 3.01 x 10-21 |
12.25 | 1003 | 1.08 x 10-21 |
12.25 | 943 | 4.08 x 10-22 |
12.25 | 883 | 5.97 x 10-23 |
12.25 | 823 | 2.66 x 10-25 |
12.25 | 773 | 6.40 x 10-26 |
8.03 | 983 | 7.47 x 10-23 |
8.03 | 943 | 2.46 x 10-23 |
8.03 | 903 | 8.47 x 10-24 |
8.03 | 863 | 1.88 x 10-24 |
8.03 | 823 | 4.29 x 10-25 |
8.03 | 773 | 1.91 x 10-26 |
8.36 | 983 | 1.87 x 10-23 |
8.36 | 943 | 8.89 x 10-24 |
8.36 | 903 | 1.37 x 10-24 |
continued
Table 71 (continued)
Grain Boundary Diffusion of 181W in Fe-Cr Alloys
Cr (wt%) | Temperature (K) | D (m3/s) |
8.36 | 863 | 9.60 x 10-26 |
8.36 | 823 | 5.45 x 10-26 |
8.36 | 773 | 6.58 x 10-27 |
8.50 | 983 | 1.88 x 10-23 |
8.50 | 943 | 1.20 x 10-23 |
8.50 | 903 | 2.49 x 10-24 |
8.50 | 863 | 5.23 x 10-25 |
8.50 | 823 | 6.59 x 10-26 |
8.50 | 773 | 6.95 x 10-27 |