Modelling of γ/α transformation in niobium-containing microalloyed steels

The thermodynamic and kinetic behaviors of gamma / alpha transformation in Nb-free and Nb-containing steels were modelled by classical nucleation and growth theories. By comparing with the experimental results, the effect of Nb on the interfacial energy, diffusion coefficients, and growth rate of re...

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Bibliographic Details
Published in:Scripta materialia 1999-03, Vol.40 (7), p.831-836
Main Authors: Lee, Kyung Jong, Lee, Jae Kon
Format: Article
Language:English
Subjects:
Applied sciences
Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
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Summary:The thermodynamic and kinetic behaviors of gamma / alpha transformation in Nb-free and Nb-containing steels were modelled by classical nucleation and growth theories. By comparing with the experimental results, the effect of Nb on the interfacial energy, diffusion coefficients, and growth rate of reactions were determined. Using the model developed, the kinetics of gamma / alpha transformation and the interface NbC precipitation were predicted. The predicted gamma / alpha transformation in the Nb-free steel was faster than that in the Nb-containing steel, and was in reasonable agreement with the experimental results during both isothermal and continuous cooling tests. It was found from the analyses that solute Nb restrained the reaction of ferrite and pearlite which required long-range diffusion of solute more than the reaction of Widmanstatten ferrite and bainite.
ISSN:1359-6462
1872-8456
DOI:10.1016/S1359-6462(99)00025-1