Transactions of Materials and Heat Treatment

Title：Research on spinning technology of 5A02 aluminum alloy pipes with large diameter and thin-wall

Authors： Li Tiejun Dong Yu Guo Qingmiao

Unit： Shenyang Aircraft Industry (Group) Co. Ltd. Aircraft Industry (Group) Co. Ltd. General Research Institute for Non-ferrous Metals

KeyWords： 5A02 aluminum alloy large diameter and thin-wall pipe cold spinning heat treatment

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2014,39(5):61-65

Abstract：

Cold spinning processes with several passes were carried out for the fabrication of 5A02 aluminum alloy pipes by using a QX63-20 horizontal power spinning machine. Optical microscope (OP) observation and microhardness testing were employed to investigate the evolution of microstructures and mechanical properties of 5A02 aluminum alloy pipes with large diameter and thin-wall during spinning process. The influence of heat treatment on the microstructure and mechanical property of cold spinning 5A02 aluminum alloy pipes were also studied. It is found that the high-quality and defect-free surfaces of 5A02 aluminum alloy pipes with the dimension of Ф85 mm×2 mm can be obtained through cold spinning by seven passes with accumulated reduction rate more than 80% and without intermediate annealing. With the increasing spinning reduction rate, the original recrystallized grains of the extruded tube are elongated gradually and transformed into small and slim fibrous structures. Meanwhile, the microhardness of pipes gradually increases from the original microhardness of 53.3 HV to 81.4 HV. The microstructure and mechanical property of 5A02 aluminum alloy pipes with large diameter and thin-wall met the application requirements were gained after heat treatment of 430 ℃ for 60 minutes.

Funds：

国家科技支撑计划资助项目（2011BAE23B02）

李铁军（1970-），男，本科，高级工程师郭青苗（1981-），女，博士，高级工程师

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