ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Generalized Nb(C, N) Precipitation Model Applicable to Extra Low Carbon Steel
Satoshi AkamatsuTakehide SenumaMitsuhiro Hasebe
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JOURNAL OPEN ACCESS

1992 Volume 32 Issue 3 Pages 275-282

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Abstract
The isothermal precipitation behavior of Nb(C, N) in austenite has been investigated using steels of different carbon contents. The observed progress of the precipitation in extra low carbon steel is much faster and size of the precipitates is apparently larger than those in steels with higher carbon content even though their supersaturations are the same. To explain this phenomenon, the local equilibrium at the austenite/Nb(C, N) interface has been introduced into the classical nucleation theory and the spherical growth theory, and a generalized precipitation model has been proposed which can predict the precipitation behavior of extra low carbon steels as well as that of HSLA steels. As a conclusion, this study clearly shows that the kinetics of MC-type precipitation is influenced not only by the precipitate-forming atomic product, M×C, but also by its ratio, M/C.
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© The Iron and Steel Institute of Japan

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs license.
https://creativecommons.org/licenses/by-nc-nd/4.0/
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