熔滴复合电弧增材制造2219铝合金组织与性能  

Structure and property of 2219 aluminum alloy fabricated by droplet+arc additive manufacturing

作　　者：王勇超 魏正英[1] 贺鹏飞 WANG Yongchao;WEI Zhengying;HE Pengfei(State Key Laboratory for Manufacturing Systems Engineering,Xi’an Jiaotong University,Xi’an 710000,China)

机构地区：[1]西安交通大学机械制造系统工程国家重点实验室,陕西西安710000

出　　处：《浙江大学学报（工学版）》2024年第8期1585-1595,共11页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(52275376).

摘　　要：为了提高铝合金电弧增材制造的质量和效率,采用新型的电弧增材制造工艺——熔滴复合电弧增材制造(DAAM)技术来制造铝合金样品.采用全新的熔滴生成系统(DGS)代替传统的送丝系统,使得材料的添加与电弧能量相互独立.成形的材料为2219铝合金,通过熔滴系统添加了微量Mg元素.利用熔滴复合电弧增材制造设备沉积了薄壁结构,沉积速率较传统电弧增材制造技术大幅提升(约为160 mm^(3)/s).观察和分析薄壁结构截面的微观组织表明,薄壁结构的晶粒形态以柱状晶为主,呈现层内柱状晶和层间等轴晶的周期性分布规律.经过T6热处理后,试样水平和垂直方向的平均抗拉强度分别为455.4和417.0 MPa,屈服强度分别为342.4和316.4 MPa.较之前的研究结果对比表明,Mg元素的添加提升了2219铝合金的屈服强度,但导致延伸率降低.A new arc additive manufacturing process—droplet+arc additive manufacturing(DAAM)technology was applied to manufacture aluminum alloy samples in order to improve the quality and the efficiency of aluminum alloy.A new droplet generation system(DGS)was applied instead of the conventional wire feeding system,which makes the material addition and arc energy independent of each other.The formed material is 2219 aluminum alloy,and a trace amount of Mg element was added through the DGS.A thin-walled structure was deposited using the DAAM system at a significantly higher deposition rate(160mm^(3)/s)than conventional wire and arc additive manufacturing techniques.The microstructure of the cross section of the thin-walled structure was observed and analyzed.Results showed that the grain morphology of the thin-walled structure was dominated by columnar crystals and exhibited a periodic distribution of inner-layer columnar crystals and inter-layer equiaxed crystals.The average tensile strengths in the horizontal and vertical directions were 455.4 MPa and 417.0 MPa after T6 heat treatment,while the yield strengths were 342.2 MPa and 316.4 MPa,respectively.The comparison results with the previous studies show that the addition of Mg element increases the yield strength of 2219 aluminum alloy,but leads to a corresponding decrease in elongation.

关 键 词：2219铝合金 电弧增材制造 熔滴 微观组织 力学性能 

分 类 号：TG444[金属学及工艺—焊接]