ZL114A电弧熔丝增材制造、热处理工艺及组织与性能研究

ZL114A电弧熔丝增材制造、热处理工艺及组织与性能研究 Wire arc additive manufacturing, heat treatment, microstructures and mechanical property of ZL114A alloy 郑涛 ZHENG Tao 1 first-author 施瀚超 SHI Hanchao 1 乔燕琦 QIAO Yanqi 1 熊华平 XIONG Huaping 1 陈昊 CHEN Hao 2 中国航发北京航空材料研究院3D打印研究与工程技术中心 中国航发北京航空材料研究院3D打印研究与工程技术中心 空军装备部驻北京地区第六军事代表室  空军装备部驻北京地区第六军事代表室  3D Printing Research and Engineering Technology Center, Beijing Institute of Aeronautical Materials 3D Printing Research and Engineering Technology Center, Beijing Institute of Aeronautical Materials 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。 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. ZL114A合金 电弧熔丝增材制造 热处理 组织与性能 ZL114A alloy wire arc additive manufacture（WAAM） heat treatment microstructure and properties TG444;TG166.3;TG146.21 2022-03-08 9 50