锻压技术

大型2A14铝合金筒形壳段细晶制造工艺

英文标题：Fine grain manufacturing technology on large 2A14 aluminum alloy cylindrical shell section

作者：姚梦付敏敏石泽民张文学周世杰

分类号：TG319；TG339

出版年,卷(期):页码：2022,47(10):42-47

摘要：

针对我国某新一代武器型号中直径为Φ2000 mm、高度为800 mm的大型2A14铝合金筒形壳段，采用常规制造工艺的产品存在性能不达标且各向异性明显、显微组织粗大且存在局部微观缺陷、性能均匀性差等问题，提出一种细晶制造工艺，即：对铸锭进行七镦六拔改锻，通过高温大变形来消除铸态组织、充分破碎残余结晶相；将环坯在280~250 ℃下温轧，有效地细化晶粒尺寸、减小各向异性；再结合“固溶+冷胀形+时效”的形变热处理工艺，能够制造出组织均匀、晶粒细小、性能优异的大型2A14铝合金筒形壳段产品。结果表明，采用细晶工艺

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.

基金项目：

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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