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Effects of Pre-Strain on Bake Hardenability and Precipitation Behavior of Al-Mg-Si Automotive Body Sheets
State Key Laboratory of Non-Ferrous Metals and Processes, China GRINM Group Co., Ltd., Beijing, China
State Key Laboratory of Non-Ferrous Metals and Processes, China GRINM Group Co., Ltd., Beijing, China
State Key Laboratory of Non-Ferrous Metals and Processes, China GRINM Group Co., Ltd., Beijing, China
GRIMAT Engineering Institute Co., Ltd., Beijing, China
General Research Institute for Nonferrous Metals, Beijing, China
- 1 State Key Laboratory of Non-Ferrous Metals and Processes, China GRINM Group Co., Ltd., Beijing, China
- 2 State Key Laboratory of Non-Ferrous Metals and Processes, China GRINM Group Co., Ltd., Beijing, China
- 3 State Key Laboratory of Non-Ferrous Metals and Processes, China GRINM Group Co., Ltd., Beijing, China
- 4 GRIMAT Engineering Institute Co., Ltd., Beijing, China
- 5 General Research Institute for Nonferrous Metals, Beijing, China
Journal of Materials Science and Chemical Engineering·Volume 12 (2024)·Pages 53–64·Published 11 July 2024·DOI10.4236/msce.2024.127005
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Abstract
The study investigates the effects of pre-strain on the bake hardenability and precipitation behavior of Al-Mg-Si automotive body sheets. The scanning electron microscopy, transmission electron microscopy, tensile test, Vickers hardness test, and differential scanning calorimetry were conducted for the purpose. It was found that the pre-strain treatment partially inhibits the natural aging hardening effect but cannot completely eliminate it. The pre-straining significantly enhances the bake hardening effect, with the 5% pre-strain sample showing the highest increase in yield strength and hardness. The formation of fine β" precipitates and dislocation structures contribute to the observed strengthening. Additionally, the study highlights the importance of optimizing pre-strain levels to achieve the best balance between strength and ductility in bake-hardened aluminum alloys.
KeywordsAl-Mg-Si AlloyPre-StrainBake HardenabilityPrecipitation BehaviorClusters
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