The grain boundary diffusivities of 48V in binary Fe-Cr alloys with 8 to 12wt%Cr (table 16), in a ternary Fe-8Cr-0.17wt%C alloy and in 2 modifications of 8%Cr ferritic steel were determined by using serial sectioning methods at temperatures ranging from 743 to 1103K. It was found that varying the Cr concentration from 8 to 12wt% did not affect the grain boundary diffusivity. The diffusivity of V in steels of commercial purity was about 4 times slower than in pure alloys.

J.Cermák, J.Ruizicková, A.Pokorná: Scripta Materialia, 1996, 34[3], 429-33

 

 

 

Table 16

Grain Boundary Diffusivity of V in Fe-Cr Alloys

 

 

Temperature (K)

 

Cr (wt%)

 

Mo (wt%)

 

V (at%)

 

sD (m3/s)

 

 

1103

 

8.07

 

-

 

-

 

2.05 x 10-20

1103

10.18

-

-

9.04 x 10-21

1103

12.25

-

-

3.92 x 10-21

1043

8.07

-

-

5.00 x 10-22

1043

10.18

-

-

6.74 x 10-22

1043

12.25

-

-

4.57 x 10-22

983

8.07

-

-

5.94 x 10-22

983

10.18

-

-

5.86 x 10-22

983

12.25

-

-

2.39 x 10-22

983

8.03

-

-

2.01 x 10-22

923

8.07

-

-

2.64 x 10-23

923

10.18

-

-

1.51 x 10-23

 

 

 

 

 

 

 

 

 

 

923

12.25

-

-

5.99 x 10-24

923

8.03

-

-

3.30 x 10-23

923

8.36

0.89

0.20

9.87 x 10-24

923

8.50

0.88

0.23

6.77 x 10-24

863

8.07

-

-

1.61 x 10-24

863

10.18

-

-

3.51 x 10-24

863

12.25

-

-

1.21 x 10-24

863

8.03

-

-

3.53 x 10-24

863

8.36

0.89

0.20

4.52 x 10-25

863

8.50

0.88

0.23

8.64 x 10-25

803

8.07

-

-

7.47 x 10-26

803

10.18

-

-

1.45 x 10-25

803

12.25

-

-

7.89 x 10-26

803

8.03

-

-

1.14 x 10-25

803

8.36

0.89

0.20

6.82 x 10-26

803

8.50

0.88

0.23

3.93 x 10-26

743

8.07

-

-

3.37 x 10-26

743

10.18

-

-

2.96 x 10-26

743

12.25

-

-

1.07 x 10-26

743

8.36

0.89

0.20

2.59 x 10-26