In graphite (Cromwell, 1958),
short-range repulsive C-C component
U = 1856 exp{-35.75r} ev
giving 0.23 eV in austenite
and 11.0 eV for C-C in ferrite
Actual (Bhadeshia, 1982)
0.086 eV in austenite
1.54 eV in ferrite
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