Abstract
The preliminary attempts to model mechanical properties of batch annealed rolled sheets have shown that the model concept for softening during annealing is reasonable. Model predictions of isothermal annealing agree very well with experimental data. For the present alloy (AA1050) it was sufficient to model an industrial batch annealing sequence (slow heating to temperature followed by 3 hours at temperature) without taking softening during heating to temperature into consideration. The sequence can simply be approximated by isothermal annealing for 3h at temperature. However, this approximation might be insufficient for other alloys. In such cases, a step-wise sequence of short isothermal annealing intervals has been suggested and verified. The modelling of batch annealing also gave good agreement with experimental data, but with a slightly faster softening kinetics than the experimental results. This is likely due to the interference of precipitated Fe-bearing particles, which is not included in the model in its present form. Further work will include modelling of other alloys, determination of material constants for other alloy systems and experimental investigations in order to clarify the role of precipitation. Precipitation is not so important for the presently modelled AA1050 alloy, but it must be included in order to extend the model to other alloys.
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