Journal
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
Volume 23, Issue 3, Pages -Publisher
SPRINGERNATURE
DOI: 10.1007/s43452-023-00749-w
Keywords
7075 aluminum alloy; Contact heating warm forming; Microstructures; Mechanical properties
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7075 aluminum alloy is being used as an ideal material for vehicle body parts due to the demand for energy-saving and lighter vehicles. The contact heating warm forming (CHWF) technology was proposed to solve the problem of strength decrease in 7075-T6 aluminum alloy after warm forming. Contact heating can quickly and efficiently heat the blank to the desired temperature.
7075 aluminum alloy is becoming an ideal material for the manufacture of vehicle body parts due to the demands for energy-saving and lighter vehicles. To solve the problem that the strength of 7075-T6 aluminum alloy decreases due to over-aging after warm forming, contact heating warm forming (CHWF) technology was proposed in this work. Contact heating is a fast and efficient heating method that can make the blank reach the target temperature in a very short time. In this work, the effect of contact heating on the mechanical properties and microstructures of 7075-T6 aluminum alloy after warm forming and paint-baking (PB) was studied. It only took about 11.5 s to heat the 2 mm 7075 aluminum alloy sheet to 200 celcius by contact heating, and the strength and the hardness of the formed parts could reach 94% and 92.5% of T6 condition, respectively. In contrast, the heating furnace needed 690 s to heat the sheet to 200 & DEG;C, and the strength and the hardness of the formed parts were 87% and 85.4% of T6 condition, respectively. Due to the fast heating rate of contact heating (17.5 celcius/s), the atoms and vacancies in the matrix did not have time to undergo diffusion and aggregation, so that the precipitates could not coarsen obviously. As a result, most of the & eta;' precipitates in the T6 condition were retained. However, long-term heating in the furnace led to the transformation of & eta;' precipitates into coarse & eta; phase and the loss of strength and hardness.
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