Influence of solute drag on the growth of proeutectoid ferrite in Fe-C-Mn alloy

Journal Article · Fri Oct 08 04:00:00 EDT 1999 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(99)00232-3· OSTI ID:20000495

Enomoto, M

The diffusion-controlled growth of proeutectoid ferrite ({alpha}) from austenite ({gamma}) in an Fe-C-Mn alloy was simulated incorporating the possible drag effect of Mn on the migration of {alpha}:{gamma} interphase boundaries. The magnitude of drag force or the dissipation of free energy by drag was evaluated by means of Cahn and Purdy-Brechet models. The growth rate of ferrite was calculated from the flux balance equation for carbon taking into account the fact that the carbon concentration at the boundary in austenite varied with time. Whereas the time exponent of growth deviated from one-half at each moment, the overall time dependence was dictated by carbon volume diffusion in austenite. The reported differences of experimental growth rates from those calculated assuming paraequilibrium were reduced considerably by incorporating the drag of Mn, although simulation results may largely depend on the shape and depth of solute interaction potential with {alpha}:{gamma} boundaries and Mn diffusivity within the boundary, etc.

• Research Organization: Ibaraki Univ. (JP)
• OSTI ID: 20000495
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 13 Vol. 47; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
CARBON ADDITIONS
CRYSTAL-PHASE TRANSFORMATIONS
DIFFUSION
FERRITE
IRON BASE ALLOYS
MANGANESE ALLOYS
MATHEMATICAL MODELS
NUCLEATION
VALIDATION