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Improvements in quench factor modelling

Record type: Article

In this contribution, the validity of a number of key quench factor analysis (QFA) assumptions is discussed. It is shown that the incorporation of a square root dependency of yield strength on precipitate volume fraction provides a sounder physical basis for quench factor modelling. Peak-aged strength/hardness prediction accuracies are not affected, but C-curve positions are. It is also demonstrated that transformation kinetics are described more correctly by a modified Starink–Zahra equation than by a Johnson–Mehl–Avrami–Kolmogorov type equation, yielding better prediction accuracies when a physically realistic Avrami exponent of 1.5 or greater is used. Finally, a regular solution model is introduced to quantify the influence of the solute solubility temperature-dependency on the minimum strength. These improvements are all implemented within the framework of classical QFA.

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Citation

Rometsch, P.A., Starink, M.J. and Gregson, P.J. (2003) Improvements in quench factor modelling Materials Science and Engineering: A, 339, (1-2), pp. 255-264. (doi:10.1016/S0921-5093(02)00110-7).

More information

Published date: 2003
Keywords: quench factor analysis, model, time–temperature-transformation, time–temperature-property, nucleation, transformation kinetics
Organisations: Engineering Mats & Surface Engineerg Gp, Engineering Sciences

Identifiers

Local EPrints ID: 22006
URI: http://eprints.soton.ac.uk/id/eprint/22006
ISSN: 0921-5093
PURE UUID: 7887356f-884d-4dbb-9dd2-f0caf1bfe02d

Catalogue record

Date deposited: 15 Mar 2006
Last modified: 17 Jul 2017 16:24

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