By using electron probe microanalysis, the diffusion of Si in 18Mn-3.6wt%Cr steel was measured at 1173 to 1423K. The diffusion data could be described by:

D (cm2/s) = 3.3 x 10-1 exp[-254.5(kJ/mol)/RT]

B.Million, K.Ciha, J.Krumpos, K.Stransky: Kovove Materialy, 1976, 14[6], 636-50

 

Table 173

Diffusion Coefficients for 59Fe in Fe-20Ni-15Cr-1.45at%Si

 

Temperature (C)

Atmosphere/Grain Size

D (cm2/s)

1363

He/fine

1.01 x 10-9

1244

Ar/fine

1.46 x 10-10

1168

vacuum/fine

6.26 x 10-11

1108

Ar/fine

1.88 x 10-11

1068

He/coarse

8.22 x 10-12

963

vacuum/coarse

6.76 x 10-13