Wu Wei, Xu Wei, Xue Jiaxiang, Yao Ping
Guangdong Polytechnic Normal University, Guangzhou, China.
Guangdong New Energy Vehicle Power and Safety System Engineering Technology Research Center, Guangzhou, China.
3D Print Addit Manuf. 2023 Aug 1;10(4):776-784. doi: 10.1089/3dp.2021.0142. Epub 2023 Aug 9.
Serious heat accumulation causes poor properties and anisotropy of products in wire and arc additive manufacturing, which restricts the further efficiency in application, especially in double-wire and double-arc depositions. Consequently, this study applied an auxiliary gas process in double-arc additive manufacturing and then compared two 50-layer depositions in morphology, microstructure, and properties to research the influence of the auxiliary process on the forming and performance. The results showed that the auxiliary gas process could improve the deposition morphology, and the efficiency was increased by 24%; moreover, the surface roughness was reduced. As the cooling and stirring effect of the auxiliary gas process, the deposition with the auxiliary gas process mainly presented short axis columnar crystal and less defects on cross-section, which was finally increasing the hardness, tensile strength, and impact toughness and bending force and decreasing the tensile strength anisotropy obviously.
在电弧增材制造中，严重的热量积聚导致产品性能不佳和各向异性，这限制了其在应用中的进一步效率，特别是在双丝和双电弧熔敷中。因此，本研究在双电弧增材制造中应用了辅助气体工艺，然后比较了两种50层熔敷层在形貌、微观结构和性能方面的差异，以研究辅助工艺对成型和性能的影响。结果表明，辅助气体工艺可以改善熔敷形貌，效率提高了24%；此外，表面粗糙度降低。作为辅助气体工艺的冷却和搅拌效果，采用辅助气体工艺的熔敷层在横截面上主要呈现短轴柱状晶且缺陷较少，最终提高了硬度、抗拉强度、冲击韧性和弯曲力，并明显降低了抗拉强度各向异性。
