Transactions of Materials and Heat Treatment

Title：Fine grain manufacturing technology on large 2A14 aluminum alloy cylindrical shell section

Authors： Yao Meng Fu Minmin Shi Zemin Zhang Wenxue Zhou Shijie

Unit： Capital Aerospace Machinery Corporation Limited Tianjin Aerospace Long March Technical Equipment Corporation Limited

KeyWords： 2A14 aluminum alloy cylindrical shell section multi-directional forging deformation heat treatment fine grain

ClassificationCode：TG319；TG339

year,vol(issue):pagenumber：2022,47(10):42-47

Abstract：

For the large-sized 2A14 aluminum alloy cylindrical shell section with the diameter of Φ2000 mm and the height of 800 mm in a new generation weapon model in China, the products manufactured by conventional manufacturing process have substandard performance and obvious anisotropy, coarse microstructure and local microscopic defects, poor performance uniformity and other problems. Therefore, a fine-grained manufacturing process was proposed, namely, the ingot was forged by upsetting seven times and drawing six times. Then, the as-cast structure was eliminated and the residual crystalline phase was fully broken by large deformation at high temperature, and the ring billet was rolled at 280-250 ℃ which refined grain size and reduced anisotropy effectively. Furthermore, combined with the deformation heat treatment process of “solution+cold bulging+aging”, the product of 2A14 aluminum alloy cylindrical shell section with uniform structure, fine grain and high performance was manufactured. The results show that the grain size of product manufactured by fine grain technology is 50~100 μm, the circumferential strength is 468 MPa,the circumferential elongation is 12.2%, the axial strength is 453 MPa,the axial elongation is 7%, the radial strength is 462 MPa,and the radial elongation is 8.7%, which fully meets the acceptance requirements.

Funds：

天津市科技计划项目（18ZXCLGX00040）

姚梦（1990-），女，硕士，工程师,E-mail：ymmyhappylife@163.com

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