Carbon diffusivity in austenite calculator

H. K. D. H. Bhadeshia

Calculates carbon diffusion in γ-Fe as a function of temperature and alloy composition. Note particularly how the diffusion coefficient is sensitive to the average carbon concentration in the austenite. The FORTRAN source code for this is available.

Based on Metal Science 15 (1981) 477–478.

Temperature

°C

Alloy composition / wt%

Carbon

wt%

Silicon

wt%

Manganese

wt%

Nickel

wt%

Molybdenum (Mo)

wt.%

Chromium

wt%

Vanadium

wt%

Calculated results

Carbon mole fraction (x_C)

C–C interaction energy in austenite

J mol⁻¹

Carbon activity in austenite

Diffusivity

cm² s⁻¹

Diffusivity (SI units)

m² s⁻¹