By using a radiotracer sectioning technique, the diffusivity of Ni in 2 high-Cr steels was studied at 1050 to 1200C. The steels contained 0.15%C, 1%Si and 0.80%Mn, and enough Ti to bind the free C. The results could be described by:
17%Cr: D (cm2/s) = 1.44 x 100 exp[-67.0(kcal/mol)/RT]
25%Cr: D (cm2/s) = 2.17 x 102 exp[-70.2(kcal/mol)/RT]
S.V.Zemskii, L.S.Makashova, S.A.Golovanenko: Izvestiya Vysshikh Uchebnykh Zavedenii Chernaya Metallurgiya, 1974, 8, 99-102
Table 64
Bulk Diffusion of 99Mo in Fe-Cr Alloys
Cr (wt%) | Temperature (K) | D (m2/s) |
8.07 | 1103 | 2.01 x 10-15 |
8.07 | 1043 | 2.80 x 10-16 |
8.07 | 983 | 7.23 x 10-17 |
8.07 | 923 | 4.69 x 10-18 |
8.07 | 863 | 3.63 x 10-19 |
8.07 | 803 | 3.38 x 10-20 |
10.18 | 1103 | 2.28 x 10-15 |
10.18 | 1043 | 3.77 x 10-16 |
10.18 | 983 | 4.00 x 10-17 |
10.18 | 923 | 2.80 x 10-18 |
10.18 | 863 | 6.26 x 10-20 |
10.18 | 803 | 3.22 x 10-20 |
12.25 | 1103 | 1.96 x 10-15 |
12.25 | 1043 | 4.64 x 10-16 |
12.25 | 983 | 4.80 x 10-17 |
12.25 | 923 | 4.50 x 10-18 |
12.25 | 863 | 7.09 x 10-20 |
12.25 | 803 | 3.15 x 10-20 |
8.03 | 983 | 5.37 x 10-17 |
8.03 | 923 | 1.03 x 10-18 |
8.03 | 863 | 1.20 x 10-19 |
8.03 | 803 | 4.55 x 10-20 |
8.36 | 983 | 6.95 x 10-17 |
8.36 | 923 | 1.35 x 10-18 |
8.36 | 863 | 3.38 x 10-20 |
8.36 | 803 | 1.44 x 10-20 |
8.50 | 983 | 6.84 x 10-17 |
8.50 | 923 | 2.62 x 10-18 |
8.50 | 863 | 2.93 x 10-20 |
8.50 | 803 | 1.74 x 10-20 |
Table 65
Grain Boundary Diffusion of 99Mo in Fe-Cr Alloys
Cr (wt%) | Temperature (K) | D (m3/s) |
8.07 | 1103 | 1.82 x 10-21 |
8.07 | 1043 | 3.08 x 10-22 |
8.07 | 983 | 1.28 x 10-22 |
8.07 | 923 | 3.74 x 10-23 |
8.07 | 863 | 2.24 x 10-24 |
8.07 | 803 | 1.72 x 10-25 |
10.18 | 1103 | 1.15 x 10-21 |
10.18 | 1043 | 3.28 x 10-22 |
10.18 | 983 | 1.10 x 10-22 |
10.18 | 923 | 6.47 x 10-23 |
10.18 | 863 | 1.87 x 10-24 |
10.18 | 803 | 7.72 x 10-26 |
12.25 | 1103 | 1.10 x 10-21 |
12.25 | 1043 | 5.29 x 10-22 |
12.25 | 983 | 8.44 x 10-23 |
12.25 | 923 | 2.56 x 10-23 |
12.25 | 863 | 1.83 x 10-24 |
12.25 | 803 | 1.93 x 10-25 |
8.03 | 983 | 2.27 x 10-22 |
8.03 | 923 | 5.26 x 10-23 |
8.03 | 863 | 4.52 x 10-24 |
8.03 | 803 | 2.43 x 10-25 |
8.36 | 983 | 5.39 x 10-23 |
8.36 | 923 | 1.33 x 10-23 |
8.36 | 863 | 6.96 x 10-25 |
8.36 | 803 | 5.09 x 10-26 |
8.50 | 983 | 1.86 x 10-23 |
8.50 | 923 | 7.93 x 10-24 |
8.50 | 863 | 8.68 x 10-25 |
8.50 | 803 | 9.54 x 10-26 |
Table 66
Lattice Diffusion Parameters for 22P in Fe-Cr
P (at%) | Cr (at%) | Phase | Do (m2/s) | E (kJ/mol) |
- | - | paramagnetic | 2.87 x 10-2 | 271 |
- | - | ferromagnetic | 1.38 x 101 | 332 |
0.16 | - | paramagnetic | 3.76 x 10-2 | 275 |
0.16 | - | ferromagnetic | 1.08 x 10-1 | 288 |
0.18 | - | paramagnetic | 2.55 x 10-3 | 247 |
0.18 | - | ferromagnetic | 1.06 x 103 | 359 |
0.38 | - | paramagnetic | 8.87 x 10-3 | 259 |
0.38 | - | ferromagnetic | 4.90 x 100 | 316 |
0.15 | 1.10 | paramagnetic | 1.07 x 10-2 | 265 |
0.15 | 1.10 | ferromagnetic | 3.36 x 10-1 | 296 |