Enhanced comprehensive properties of directed energy deposited Inconel 718 by a novel integrated deposition strategy

被引:53
作者
Xi, Naiyuan [1 ]
Tang, Kexin [1 ]
Fang, Xuewei [1 ]
Li, Yan [1 ]
Duan, Yusong [1 ]
Huang, Ke [1 ]
机构
[1] Xi An Jiao Tong Univ, State Key Lab Mfg Syst Engn, Xian 710054, Peoples R China
来源
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2023年 / 141卷
基金
中国国家自然科学基金;
关键词
Wire arc additive manufacturing; Deposition strategy; Microstructure characterization; Strengthening mechanism; Inconel; 718; CYCLE FATIGUE BEHAVIOR; MECHANICAL-PROPERTIES; HEAT-TREATMENT; LAVES PHASES; WIRE; MICROSTRUCTURE; STEEL; PRECIPITATION;
D O I
10.1016/j.jmst.2022.09.026
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Nickel-based superalloys fabricated by wire-arc directed energy deposition, also known as wire arc ad-ditive manufacturing (WAAM), usually exhibit inherent columnar grain structure, micro-segregation, and rough surface. A novel deposition strategy, integrating an oscillating arc and forced interlayer cooling, was developed in WAAM of Inconel (IN) 718 components. The influences of deposition modes on geometrical characteristics, defects, microstructure, and mechanical properties were systematically evaluated. The re-sults showed that the oscillation mode, compared to the standard parallel mode, can effectively promote the molten pool's spread and wettability, as well as prevent overflow, finally resulting in high geometric accuracy. In addition, the voids-like defects were reduced by 77.78%, while most common crack defects were not observed. Meanwhile, the forced interlayer cooling process further increased the cooling rate, leading to the reduction of the element segregation as well as the proportion of long-chain-like Laves phases. After a short-process modified heat treatment, the anisotropic mechanical behaviors of the as -deposited samples were almost eliminated. Compared with the parallel mode samples, the yield strength and ultimate tensile strength of the oscillation path samples increased by 5.75% and 9.25%, respectively, while the elongation increased significantly by 51.20%. This signifies that their strength and ductility were simultaneously improved. The strengthening mechanisms were further analyzed based on the distribution of the strengthening phases, as well as the residual Laves phases and porosity.(c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码:42 / 55
页数:14
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