Improvements in quench factor modelling


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).

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Description/Abstract

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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/S0921-5093(02)00110-7
ISSNs: 0921-5093 (print)
Keywords: quench factor analysis, model, time–temperature-transformation, time–temperature-property, nucleation, transformation kinetics
Subjects:

Organisations: Engineering Mats & Surface Engineerg Gp
ePrint ID: 22006
Date :
Date Event
2003Published
Date Deposited: 15 Mar 2006
Last Modified: 16 Apr 2017 22:53
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/22006

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