The tracer diffusion of 48V in ferritic alloys was measured by using the serial sectioning method (table 3). It was found that varying the Cr concentration from 8 to 12wt%, or adding up to 0.17wt%C, or alloying with small amounts of other elements, did not have any significant effect upon the V tracer diffusion coefficient. The temperature dependence of the diffusion coefficients revealed the magnetic diffusion anomaly. It was fitted by using the semi-empirical Jonsson equation. This could be taken to be a convenient interpolation formula for the rapid calculation of V diffusivities in ferritic steels with 8 to 12%Cr. The V tracer diffusivities were higher, by a factor of about 1.8, than those of W.

J.Cermák, J.Ruzicková, A.Pokorná: Scripta Metallurgica et Materialia, 1995, 33[7], 1069-73

 

 

 

Table 3

Diffusivity of 48V in Fe-Cr Alloys

 

 

Cr (at%)

 

Temperature (K)

 

D (m2/s)

 

 

8.07

 

863

 

1.25 x 10-19

8.07

923

1.06 x 10-18

8.07

983

2.15 x 10-17

8.07

1043

2.23 x 10-16

8.07

1103

1.54 x 10-15

10.18

863

8.74 x 10-20

10.18

923

1.35 x 10-18

10.18

983

2.15 x 10-17

10.18

1043

3.95 x 10-16

10.18

1103

1.02 x 10-15

12.25

863

7.81 x 10-20

12.25

923

1.44 x 10-18

12.25

983

2.03 x 10-17

12.25

1043

3.10 x 10-16

12.25

1103

1.12 x 10-15

8.03

863

7.31 x 10-20

8.03

923

1.94 x 10-18

8.03

983

1.93 x 10-17

8.36

863

1.06 x 10-19

8.36

923

2.08 x 10-18

8.36

983

2.12 x 10-17

8.50

863

1.21 x 10-19

8.50

923

1.10 x 10-18

8.50

983

6.03 x 10-17