Constitutive modelling of plastic deformation behaviour for AA7075-H18 alloy based on hot forming and in-die quenching (HFQ®) process
Source abstract
Abstract
Application of HFQ® technology to 7xxx-series alloy sheet has attracted increased attention because of the rapidly growing demand for lightweight automobiles. The present research employed the AA7075-H18 cold-rolled sheet suitable for continuous HFQ® production as the investigation object for the first time. Tensile experiments were performed using a Gleeble-3800 thermo-mechanical simulator within the temperature range of 300 °C –450 °C and strain rate range (0.001 s−1–10 s−1) to characterise the plastic flow behaviour under the application of HFQ® conditions. The tensile samples were soaked at the solution temperature, after which they were quenched to the target temperature and immediately tested. Static recovery (SRV) and static recrystallization (SRX) occurred during the application of solution heat treatment (SHT) process. The modified Zerilli-Armstrong (ZA) constitutive model of AA7075 under conditions representative of HFQ® was developed based on the Gleeble test data. At elevated temperatures, the AA7075 alloy exhibited noticeable temperature and strain rate sensitivity. The plastic flow stress of the sheet decreased substantially with the increase in deformation temperature or the decrease in strain rate, and the elongation after fracture slightly increased in parallel with the deformation temperature or strain rate. Microstructural evolution and plastic flow curves confirmed that dynamic recovery (DRV) and dynamic recrystallization (DRX) occurred at elevated temperatures. The proposed ZA equation and Yld2000-2d yield function were applied to model the HFQ® process of a cup-shaped part, and the numerical results were in good agreement with the experimental data.
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Research context
OpenAlex topics: Metallurgy and Material Forming · Metal Forming Simulation Techniques · Microstructure and mechanical properties
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References (51)
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