ZL205A电弧熔丝增材制造堆积体的组织与性能

Microstructure and Mechanical Properties of aluminum alloy (ZL205A) wall produced by wire arc additive manufacturing method

摘要:

用电弧熔丝增材制造技术(WAAM)进行ZL205A铝合金的堆积实验。通过金相、SEM、EDS及拉伸试验,考察堆积体的微观组织和力学性能等,并与金属型铸造试样进行对比。结果发现,堆积体厚度均匀,表面平整,堆积体中元素B和Cd的烧损率分别达到60%和50%。与金属型铸造铸态试样相比较,WAAM直接堆积态晶粒大小更均匀,晶粒尺寸更小,析出相在晶内和晶界上均匀分布。T6热处理后,θ相完全固溶到Al基体中,在晶界上均匀分布着复熔T相,堆积体T6的力学性能达到抗拉强度500Mpa,屈服强度450Mpa,延伸率10%,均高于金属型铸造试样的水平,且试样在横纵两个方向上力学性能一致。

Abstract:

The wall of ZL205A aluminum alloy were carried out by the wire+arc additive manufacturing technology (WAAM). The microstructure,mechanical properties and so on of ZL205A aluminium alloy wall were investigated by metallographic, SEM, EDS and tensile tests, and compared with that of metal casting alloy. The results show that the thickness of the wall is uniform and the surface is smooth. Meanwhile, the burning rates of B and Cd inStheSdepositSbody are 60% and 50%, respectively. Compared with cast alloys at casting condition, the as-deposited WAAM ZL205A have more uniform grain size, smaller grain size and uniform distribution of precipitated phases in grain and grain boundaries. After heat treatment (T6), θ-phase is completely dissolved into Al matrix, and the re-melted T-phase distributes on the grain boundary. The tensile strength, yield strength and elongation of the wall are 500 Mpa, 450 Mpa and 10%, respectively, which are higher than that of the metal casting alloy, and the mechanical properties of the alloy in transverse and longitudinal directions are the same.