Modeling the microstructural changes during hot tandem rolling of AA5XXX aluminum alloys. Part 1: Microstructural evolution
- Univ. of British Columbia, Vancouver, British Columbia (Canada). Centre for Metallurgical Process Engineering
- Alcan International Limited, Kingston, Ontario (Canada). Kingston Research and Development Centre
A comprehensive mathematical model of the hot tandem rolling process for aluminum alloys has been developed. Reflecting the complex thermomechanical and microstructural changes effected in the alloys during rolling, the model incorporated heat flow, plastic deformation, kinetics of static recrystallization, final recrystallized grain size, and texture evolution. The results of this microstructural engineering study, combining computer modeling, laboratory tests, and industrial measurements, are presented in three parts. In this Part 1, laboratory measurements of static recrystallization kinetics and final recrystallized grain size are described for AA5182 and AA5052 aluminum alloys and expressed quantitatively by semiempirical equations. The laboratory measurements for the microstructural evolution were carried out using industrially rolled material and a state-of-the-art plane strain compression tester at Alcan International. Each sample was given a single deformation and heat treated in a salt bath at 400 C for various lengths of time to effect different levels of recrystallization in the samples. The range of hot-working conditions used for the laboratory study was chosen to represent conditions typically seen in industrial aluminum hot tandem rolling processes, i.e., deformation temperatures of 350 C to 500 C, strain rates of 0.5 to 100 seconds and total strains of 0.5 to 2.0. The semiempirical equations developed indicated that both the recrystallization kinetics and the final recrystallized grain size were dependent on the deformation history of the material, i.e., total strain and Zener-Hollomon parameter (Z), where Z = {dot {var_epsilon}} exp (Q{sub def}/RT{sub def}) and time at the recrystallization temperature.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 634653
- Journal Information:
- Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Vol. 29, Issue 3; Other Information: PBD: Jun 1998
- Country of Publication:
- United States
- Language:
- English
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