Al-6.3Cu铝合金电弧填丝增材制造成形与组织性能

Geometry, Microstructure and Properties of Wire+Arc Additive Manufacturing Al-6.3Cu Alloy Deposits

采用HPVP-GTAW电弧作为热源进行Al-6.3Cu合金的电弧填丝增材制造,试验研究送丝速度和运动速度对成形层高和层宽的影响,并对比分析常规VP-GTAW和HPVP-GTAW两种热源对构件组织性能的影响。结果表明:协调调节WFS和TS可在获得良好成形外观的同时实现对构件尺寸的有效控制;Al-6.3Cu合金构件内部组织呈现出典型层状分布特征,且各部位组织特征相类似,主要由等轴晶粒组成;原始状态下WAAM构件具有很好的塑性,但其强度较低,与常规VP-GTAW相比,HPVP-GTAW有助于提高增材构件的强度。

Wire＋arc additive manufacturing（WAAM） system for Al-6.3Cu alloy using hybrid pulse variable polarity gas tungsten arc welding（HPVP-GTAW） process was established. The geometry of Al-6.3Cu single-pass multilayer deposits influenced by wire feed speed and travel speed, microstructure and tensile properties of deposited samples produced by the conventional VP-GTAW and HPVP-GTAW process were investigated. Experimental results show that the effective control on deposits geometry is obtained with the coordination of wire feed speed and travel speed. The internal structure of Al-6.3Cu deposits shows the typical layered distribution characteristics, mainly composed of equiaxed grains. WAAM samples with as-deposited condition have good plasticity, but the relatively low strength. Compared with conventional VPGTAW process, it is beneficial in enhancing the strength of Al-6.3Cu deposits using HPVP-GTAW process.