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采用LD60三辊精密管材轧机对5A02铝合金管坯进行了轧制,利用光学显微镜、硬度计和万能试验机分析了冷加工率、中间退火温度及保温时间对5A02铝合金薄壁管材组织及性能的影响。确定了5A02铝合金薄壁管材在轧制中选择57.2%作为第一道次加工率,在380～410℃时退火保温30～60 min后组织性能较好;轧制后的成品管材在410℃保温60 min后,管材中的纤维状组织完全消失,且再结晶组织较细小,力学性能满足了使用要求。
5A02 aluminum alloy tube was rolled by LD60 three-roll precision tube mill. The microstructure and properties of 5A02 aluminum alloy thin-walled tube were analyzed by optical microscope, hardness tester and universal testing machine, and the cold working rate, intermediate annealing temperature and holding time were analyzed. influences. 5A52 aluminum alloy thin-walled pipe was selected as the first pass rate of 57.2% during rolling, and annealed at 380-410 ℃ for 30-60 min, the microstructure and properties were better. The finished pipe after rolling was cooled at 410 ℃ After 60 min incubation, the fibrous tissue in the tube completely disappeared, and the recrystallized microstructure was smaller, and the mechanical properties satisfied the requirements of use.