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Analysis of soft impingement in nonisothermal precipitation

Published online by Cambridge University Press:  31 January 2011

Kai Fan ,
Feng Liu ,
Wei Yang ,
Gencang Yang  and
Yaohe Zhou
Feng Liu*
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, People’s Republic of China
Yaohe Zhou
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effects of soft impingement on precipitation are considered. A physically realistic analytical treatment of soft impingement has been developed for solid-state precipitation in a nonisothermal heating/cooling process following the basic assumptions (i.e., a two-stage transformation including site saturation of nucleation, isotropic growth and linear approximation for a concentration gradient in front of the precipitate/matrix interface). Furthermore, both one- and three-dimensional precipitations have been described using a compact expression which is analogous to Zener’s model but with a temperature-dependent growth coefficient. A detailed description for the model parameters has been given for the model application. Good agreement with published experimental data, for example, the decomposition of austenite in a 0.038–0.30wt%Mn plain carbon steel, has been achieved.

Keywords

AnnealingNucleation & growthPhase transformation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 12 , December 2009 , pp. 3664 - 3673
Copyright
Copyright © Materials Research Society 2009

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References

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