Feasibility study on contact heating warm forming of 7075-T6 aluminum alloy

• Autorzy: Sun Lu , Zhang Zhiqiang , Song Zhenkun , Ren Mingwen , Jia Hongjie

Identyfikatory

DOI

10.1007/s43452-023-00749-w

• Języki publikacji: EN

Abstrakty

EN

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 ℃ 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 °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 ℃/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 η' precipitates in the T6 condition were retained. However, long-term heating in the furnace led to the transformation of η' precipitates into coarse η phase and the loss of strength and hardness.

Słowa kluczowe

EN

7075 aluminum alloy; contact heating warm forming; microstructures; mechanical properties

PL

stop aluminium 7075; mikrostruktura; właściwości mechaniczne

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2023
• Tom: Vol. 23, no. 3
• Strony: art. no. e209, 2023
• Opis fizyczny: Bibliogr. 24 poz., rys., wykr.

Twórcy

autor

Sun Lu

• Key Laboratory of Automobile Materials, Ministry of Education and School of Material Science and Engineering, Jilin University, 5988 Renmin Street, Changchun 130022, China

autor

Zhang Zhiqiang

• Key Laboratory of Automobile Materials, Ministry of Education and School of Material Science and Engineering, Jilin University, 5988 Renmin Street, Changchun 130022, China

autor

Song Zhenkun

• Key Laboratory of Automobile Materials, Ministry of Education and School of Material Science and Engineering, Jilin University, 5988 Renmin Street, Changchun 130022, China

autor

Ren Mingwen

• Key Laboratory of Automobile Materials, Ministry of Education and School of Material Science and Engineering, Jilin University, 5988 Renmin Street, Changchun 130022, China

autor

Jia Hongjie

• Key Laboratory of Automobile Materials, Ministry of Education and School of Material Science and Engineering, Jilin University, 5988 Renmin Street, Changchun 130022, China

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024)