A STATEVARIABLE APPROACH FOR PREDICTING THE TIME REQUIRED FOR 50% RECRYSTALLIZATION
Abstract
It is important to be able to model the recrystallization kinetics in aluminum alloys during hot deformation. The industrial relevant process of hot rolling is an example of where the knowledge of whether or not a material recrystallizes is critical to making a product with the correct properties. Classically, the equations that describe the kinetics of recrystallization predict the time to 50% recrystallization. These equations are largely empirical; they are based on the free energy for recrystallization, a ZenerHolloman parameter, and have several adjustable exponents to fit the equation to engineering data. We have modified this form of classical theory replacing the ZenerHollomon parameter with a deformation energy increment, a free energy available to drive recrystallization. The advantage of this formulation is that the deformation energy increment is calculated based on the previously determined temperature and strainrate sensitivity of the constitutive response. We modeled the constitutive response of the AA5182 aluminum using a state variable approach, the value of the state variable is a function of the temperature and strainrate history of deformation. Thus, the recrystallization kinetics is a function of only the state variable and free energy for recrystallization. There are no adjustable exponents as in classical theory. Usingmore »
 Authors:
 Publication Date:
 Research Org.:
 Los Alamos National Lab., NM (US)
 Sponsoring Org.:
 US Department of Energy (US)
 OSTI Identifier:
 768739
 Report Number(s):
 LAUR003812
TRN: AH200123%%343
 DOE Contract Number:
 W7405ENG36
 Resource Type:
 Conference
 Resource Relation:
 Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Aug 2000
 Country of Publication:
 United States
 Language:
 English
 Subject:
 36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; FREE ENERGY; KINETICS; RECRYSTALLIZATION; ROLLING; HOT WORKING; TIME DEPENDENCE; MATHEMATICAL MODELS; STRAIN RATE
Citation Formats
M. STOUT, and ET AL. A STATEVARIABLE APPROACH FOR PREDICTING THE TIME REQUIRED FOR 50% RECRYSTALLIZATION. United States: N. p., 2000.
Web.
M. STOUT, & ET AL. A STATEVARIABLE APPROACH FOR PREDICTING THE TIME REQUIRED FOR 50% RECRYSTALLIZATION. United States.
M. STOUT, and ET AL. 2000.
"A STATEVARIABLE APPROACH FOR PREDICTING THE TIME REQUIRED FOR 50% RECRYSTALLIZATION". United States.
doi:. https://www.osti.gov/servlets/purl/768739.
@article{osti_768739,
title = {A STATEVARIABLE APPROACH FOR PREDICTING THE TIME REQUIRED FOR 50% RECRYSTALLIZATION},
author = {M. STOUT and ET AL},
abstractNote = {It is important to be able to model the recrystallization kinetics in aluminum alloys during hot deformation. The industrial relevant process of hot rolling is an example of where the knowledge of whether or not a material recrystallizes is critical to making a product with the correct properties. Classically, the equations that describe the kinetics of recrystallization predict the time to 50% recrystallization. These equations are largely empirical; they are based on the free energy for recrystallization, a ZenerHolloman parameter, and have several adjustable exponents to fit the equation to engineering data. We have modified this form of classical theory replacing the ZenerHollomon parameter with a deformation energy increment, a free energy available to drive recrystallization. The advantage of this formulation is that the deformation energy increment is calculated based on the previously determined temperature and strainrate sensitivity of the constitutive response. We modeled the constitutive response of the AA5182 aluminum using a state variable approach, the value of the state variable is a function of the temperature and strainrate history of deformation. Thus, the recrystallization kinetics is a function of only the state variable and free energy for recrystallization. There are no adjustable exponents as in classical theory. Using this approach combined with engineering recrystallization data we have been able to predict the kinetics of recrystallization in AA5182 as a function of deformation strain rate and temperature.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2000,
month = 8
}

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