Abstract
To study the factors that affect the mechanical properties of materials, double-pass hot compression tests were performed under different deformation parameters using a Gleeble-3500 thermo-simulation machine. The static softening behavior of 5754 aluminium alloy during testing was analyzed by the 0.2% offset-stress method. The results show that the static softening fraction was greatly influenced by deformation parameters and rapidly increased with increasing delay time, strain rate and deformation temperature. In addition, a mesoscopic cellular automaton (CA) model was employed to simulate the microstructural evolution of the static recrystallization (SRX) during the double-pass hot compression test of the 5754 aluminium alloy. The results show that the SRX nuclei first formed along the grain boundaries, where the energy was sufficient, and deformation parameters had a significant influence on the SRX of the 5754 aluminium alloy. The recrystallized volume fraction increased with increasing temperature, strain rate, and delay time among deformation stages. The mean recrystallized grain size increased with increasing deformation temperature and delay time. However, the mean grain size was slightly reduced with an increase in the strain rate from 0.1 s−1 to 1 s−1 at constant temperature and delay time.
Highlights
The heating process used to form materials is of remarkable importance, as it affects the quality of the products [1,2]
Previous studies have shown that complex metallurgical structural changes that occurred during multi-pass hot rolling and hot compression processes resulted from competing work hardening and softening mechanisms [3,4]
Static softening behavior plays a crucial role in the hot compression process, as it has a great influence on the forming load and the microstructural evolution during each pass [5]
Summary
The heating process used to form materials is of remarkable importance, as it affects the quality of the products [1,2]. Previous studies have shown that complex metallurgical structural changes that occurred during multi-pass hot rolling and hot compression processes resulted from competing work hardening and softening mechanisms [3,4]. Static softening behavior plays a crucial role in the hot compression process, as it has a great influence on the forming load and the microstructural evolution during each pass [5]. It is well known that static recrystallization may occur during the inter-pass holding intervals between double pass and multi-pass hot compression. It is necessary to evaluate the static recrystallization process with different deformation parameters. Recrystallization normally begins at atypical locations in the average microstructure of a deformed material, and the characteristics
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