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).
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.
|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
|Date Deposited:||15 Mar 2006|
|Last Modified:||28 Jun 2012 09:53|
|Contact Email Address:||M.J.Starink@soton.ac.uk|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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