Journal
METALS
Volume 9, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/met9030305
Keywords
aluminium; 7021; 7075; hot stamping; W-temper forming; stabilisation heat treatment; crashworthiness
Funding
- Austrian Research Promotion Agency (FFG)
- Federal Ministry for Transport, Innovation and Technology (BMVIT)
- State of Upper Austria [872641, 843537]
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Due to their high specific strength, EN AW-7xxx aluminium alloys are promising materials for reducing the weight of automotive structural parts. However, their formability at room temperature is poor due to pronounced natural ageing. Therefore, we investigated hot stamping and W-temper forming for EN AW-7075 and a modified variant of EN AW-7021. For hot stamping of the modified EN AW-7021, a low-temperature stabilisation heat treatment (pre-aging at 80 degrees C for 1 h) was incorporated into the process chain design to inhibit natural ageing after forming. The process chains were compared with respect to dimensional accuracy, mechanical properties, microstructure, precipitation status (assessed by differential scanning calorimetry) and crashworthiness. It was found that hot stamping is suitable to form failure-free parts with good dimensional accuracy for both alloys while W-temper forming suffers from springback. Within a time-span of 21 days after forming, hardness values of hot stamped and stabilised parts did not increase significantly. Compared to non-stabilised parts, stabilised parts also showed significantly improved folding behaviour in quasi-static compression testing and absorbed approximately 15% more energy.
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