ABSTRACT

Gas metal arc welding based on wire arc additive manufacturing was adopted to fabricate a non-equiatomic Al_2.1Co_0.3Cr_0.5FeNi_2.1 thick-walled component. The combined cable wire composed of three filaments with different elemental compositions was used as the feeding material. The microstructure and mechanical properties of the as-deposited component were investigated. The deposited sample consisted of dendrite grains ranging in size from 5 to 15 µm and interdendritic regions. The compressive yield strength and ultimate compressive strength of the obtained material are 550 and 1899 MPa. The microhardness test revealed an average value of 463 HV. The nanohardness and the elastic modulus of the sample are 10.4 and 304 GPa, respectively. Energy-dispersive spectroscopy showed that the elemental distribution in the top, middle, and bottom areas of the sample is uniform. X-ray diffraction analysis revealed two main phases of Al-Ni-Co-rich B2 and Fe-Cr-rich A2 in the material.

摘要

采用基于电弧增材制造的气体保护金属电弧焊制备非等原子Al _2.1 Co _0.3 Cr _0.5 FeNi _2.1厚壁组件。由具有不同元素组成的三根长丝组成的组合电缆线用作进料材料。研究了沉积态组件的显微组织和机械性能。沉积样品由尺寸范围为 5 至 15 µm 的枝晶晶粒和枝晶间区域组成。所得材料的压缩屈服强度和极限压缩强度分别为550和1899 MPa。显微硬度测试显示平均值为 463 HV。样品的纳米硬度和弹性模量分别为 10.4 和 304 GPa。能量色散光谱显示样品顶部、中部和底部区域的元素分布均匀。X 射线衍射分析揭示了材料中富含 Al-Ni-Co 的 B2 和富含 Fe-Cr 的 A2 的两个主要相。