The effect of the concentration-dependent diffusivity of carbon in austenite on a model of reaustenitisation from ferrite/cementite mixtures in Fe-C steels

C. Atkinson; Taner Akbay

doi:10.1016/1359-6454(95)00390-8

The effect of the concentration-dependent diffusivity of carbon in austenite on a model of reaustenitisation from ferrite/cementite mixtures in Fe-C steels

C. Atkinson, Taner Akbay

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

Phase transformation theory applicable to reaustenitisation that takes place upon heating low-alloy steels is described. The assumption of local equilibrium is made. Diffusivity of interstitial solute in austenite is treated as concentration dependent and no diffusion is allowed in cementite and ferrite. Under these assumptions, the process is controlled by the diffusion of the interstitial solute in the growing phase. A variational dual extremum principle is used to calculate the interstitial solute concentration profile for specified interface motions. These results are compared with those obtained for a constant diffusivity equal to a weighted average of the concentration-dependent diffusivity and to a variety of simple approximations to the full problem.

Original language	English
Pages (from-to)	2861-2868
Number of pages	8
Journal	Acta Materialia
Volume	44
Issue number	7
DOIs	https://doi.org/10.1016/1359-6454(95)00390-8
Publication status	Published - Jan 1 1996

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/1359-6454(95)00390-8

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AB - Phase transformation theory applicable to reaustenitisation that takes place upon heating low-alloy steels is described. The assumption of local equilibrium is made. Diffusivity of interstitial solute in austenite is treated as concentration dependent and no diffusion is allowed in cementite and ferrite. Under these assumptions, the process is controlled by the diffusion of the interstitial solute in the growing phase. A variational dual extremum principle is used to calculate the interstitial solute concentration profile for specified interface motions. These results are compared with those obtained for a constant diffusivity equal to a weighted average of the concentration-dependent diffusivity and to a variety of simple approximations to the full problem.

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