Wire arc additive manufacturing, heat treatment, microstructures and mechanical property of ZL114A alloy

ZHENG Tao; SHI Hanchao; QIAO Yanqi; XIONG Huaping; CHEN Hao

doi:10.7512/j.issn.1001-2303.2020.09.27

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Wire arc additive manufacturing, heat treatment, microstructures and mechanical property of ZL114A alloy
Vol. 50, Issue 9, Pages: 245-250(2020)
DOI： 10.7512/j.issn.1001-2303.2020.09.27

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ZHENG Tao, SHI Hanchao, QIAO Yanqi, et al. Wire arc additive manufacturing, heat treatment, microstructures and mechanical property of ZL114A alloy. [J]. 50(9):245-250(2020)
DOI：

ZHENG Tao, SHI Hanchao, QIAO Yanqi, et al. Wire arc additive manufacturing, heat treatment, microstructures and mechanical property of ZL114A alloy. [J]. 50(9):245-250(2020) DOI： 10.7512/j.issn.1001-2303.2020.09.27.

摘要

采用电弧熔丝增材制造(Wire Arc Additive Manufacture,WAAM)成形技术对ZL114A合金成形工艺进行了研究,分析了WAAM成形沉积态和热处理试样微观组织及力学性能。结果发现:沉积态的微观组织由树枝状晶的α-Al基体和颗粒状共晶Si相组成,并且相邻两道焊缝的重叠区域形成粗晶区;相较于传统金属型铸造,沉积态晶粒更加细小、共晶Si相细小均匀分布;经T6热处理后,树枝晶消失,共晶Si相发生球化,呈细小弥散状态分布,显著提升了试样的力学性能:电弧熔丝增材ZL114A合金的抗拉强度、屈服强度和延伸率分别达到370.0 MPa、310.4 MPa、8.6%,并且拉伸断口表现为韧性断裂。

Abstract

The process of ZL114 A alloy fabricated by wire arc additive manufacture（WAAM） was studied. The microstructure and mechanical properties of as-deposited specimens fabricated by WAAM and heattreated specimens were analyzed. The results show that the microstructure of as-deposited is composed of dendritic α-Al matrix and granular eutectic Si-phase, and the coarse crystal regions occurred in the twoneighboured welding beads in the WAAMed component. Compared with the traditional metal casting method, the microstructure of as-deposited specimens shows smaller grains and the distribution of the fine eutectic Si-phase becomes uniform. After T6 heat treatment, the dendrite in the WAAMed specimens disappears and the eutectic Si-phases are spheroidized and they show a finely-dispersed distribution. These microstructure characteristic contributes to the significant improvement of the mechanical properties. The tensile strength, yield strength and elongation of the WAAMed component are 370.0 MPa/310.4 MPa and 8.6%, respectively, and the surface of the tensile specimens fracture is characterized by ductile fracture.