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高强Al-Mg合金钨极氩弧双丝增材制造工艺与组织性能
何杰, 冯曰海, 张林, 占彬
南京理工大学, 南京 210094
摘要:
针对钨极氩弧增材制造铝合金构件效率低的不足,采用二根同质铝镁合金丝材同步送进同一熔池的增材制造方式,从而达到高效率高质量制造高强铝镁合金构件的目的.试验中分别采用单填丝和双填丝钨极氩弧工艺,分别制造了直壁体试样,对比试验研究了二种工艺增材制造试样在宏观尺寸、显微组织和力学性能上的差异.结果表明,在相同的工艺参数条件下,双填丝增材制造工艺熔敷速率是单填丝工艺的2.08倍,试样的晶粒明显更加细小;所制造试样的抗拉强度达到铸造7A52铝镁合金的71%,纵向抗拉强度相对单填丝提高了7%,纵向断后伸长率提高了5%.
关键词:  双填丝  钨极氩弧  高强铝镁合金  增材制造
DOI:10.12073/j.hjxb.2019400191
分类号:TG455
基金项目:国防创新特区项目(17-H863);总装备部研究项目(41423050125)
Research on microstructure and mechanical properties of high strength Al-Mg alloy fabricated by double-wire and gas tungsten arc additive manufacturing process
HE Jie, FENG Yuehai, ZHANG Lin, ZHAN Bin
Nanjing University of Science and Technology, Nanjing 210094, China
Abstract:
A new gas tungsten arc additive manufacturing process, with two homogeneous aluminum magnesium alloy wires synchronously feeding into same molten pool, was performed to manufacture high strength aluminum magnesium alloy component.Straight wall specimens were deposited by traditional single wire feeding and double-wire feeding gas tungsten arc additive manufacturing process, respectively. The difference in appearance size measurements, optical microscope, mechanical properties of the specimens were comparative studied in details. The results show the deposition rate of the double wire feeding mode is 2.08 times of the single wire feeding. The double wire feeding mode achieves finer grain. Moreover, the ultimate tensile strength of the double wire feeding mode reaches 71% of the 7A52 aluminum magnesium alloy. Compared with the single-wire feeding. the longitudinal ultimate tensile strength improved by 7% and the longitudinal elongation improved by 5% as well.
Key words:  double-wire feeding  gas tungsten arc  high strength aluminum magnesium alloy  additive manufacturing