The Gruzin method was used to study the bulk and grain-boundary diffusion of 59Fe (tables 86 to 88) in steels which contained 0.3Mn, 0.2Si, 0.004S and 0.007wt%P in addition to major concentrations of Cr and Ni. Mathematical analysis showed that the energy of the grain boundary was a function of the difference between the activation energies for volume and grain-boundary diffusion.

P.Guiraldenq, P.Poyet: Mémoires Scientifiques de la Revue de Métallurgie, 1973, 70[10], 715-23

 

Table 87

Grain Boundary Diffusion Parameters for 59Fe

in Fe-Ni-19wt%Cr Alloys at 900 to 1200C

 

Ni (wt%)

Do (cm3/s)

E (kcal/g-atom)

10

1.6 x 10-11

17

30

2.0 x 10-10

25

45

4.0 x 10-9

42.5

55

4.0 x 10-7

35.5

65

3.2 x 10-5

56

75

1.0 x 10-4

60.5