A solute drag treatment of the effects of alloying elements on the rate of the proeutectoid ferrite transformation in steels

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Acta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-7151(95)90160-4· OSTI ID:116125

Purdy, G R ^[1]; Brechet, Y J.M. ^[2]

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1. McMaster Univ., Hamilton, Ontario (Canada). Dept. of Materials Science and Engineering
2. Inst. National Polytechnique de Grenoble, St. Martin d`Heres (France)

The problem of diffusional growth of a proeutectoid constituent in a ternary steel is considered, taking into account the interfacial diffusion of a slow-diffusing substitutional solute, under conditions which do not permit its long-range redistribution between parent and daughter phases. It is assumed that the faster diffusing interstitial solute (carbon) controls the rate of the transformation. The substitutional solute profile within (across) the interface is estimated as a function of interface velocity; the interstitial chemical potential difference is allowed to vary with, and balance, the solute drag due to the substitutional component. A transition to paraequilibrium is found at high interface velocities, and a variety of behavior is predicted for intermediate states, depending on the relative rates of diffusion of the two solutes and their energetic interactions with each other and with the interphase boundary.

• OSTI ID: 116125
• Journal Information: Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 10 Vol. 43; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON
CRYSTAL-PHASE TRANSFORMATIONS
DIFFUSION
FERRITE
GRAIN BOUNDARIES
INTERFACES
KINETICS
MANGANESE
MATHEMATICAL MODELS
MOLYBDENUM
PRECIPITATION
SOLUTES
STEELS