Short communication: Hardness based model for determining the kinetics of precipitation
A theoretical model based on Johnson-Mehl-Avrami (JMA) formalism for determining kinetics and activation energy of a precipitation process is derived from the variation in hardness properties. Effectiveness of the model for determining the kinetics of beta-NiAl precipitation in PH13-8Mo steel and fo...
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| Veröffentlicht in: | Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2009-01, Vol.500 (1-2), p.244-247 |
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| Hauptverfasser: | , , |
| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | A theoretical model based on Johnson-Mehl-Avrami (JMA) formalism for determining kinetics and activation energy of a precipitation process is derived from the variation in hardness properties. Effectiveness of the model for determining the kinetics of beta-NiAl precipitation in PH13-8Mo steel and for distinguishing the kinetics between two temperatures is also demonstrated. The activation energy for beta-precipitation, 244.3 kJ/mol, determined over 808 K to 868 K is in good agreement with that of diffusion of Ni and Al in alpha-iron. |
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| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2008.09.056 |