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), 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
Related URLs:
Keywords: quench factor analysis, model, time–temperature-transformation, time–temperature-property, nucleation, transformation kinetics
Subjects: T Technology > TN Mining engineering. Metallurgy
Q Science > QA Mathematics
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 22006
Date Deposited: 15 Mar 2006
Last Modified: 27 Mar 2014 18:11
Contact Email Address: M.J.Starink@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/22006

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