Synergistic effect of transpassive film and gamma double prime phase on the electrochemical dissolution behavior of Inconel 718 manufactured by laser directed energy deposition

被引：4
作者：
Zhang, Yufeng [1 ,2 ]
Yu, Jun [1 ,2 ]
Lin, Xin [1 ,2 ]
Guo, Pengfei [3 ]
Yan, Qiaodan [1 ,2 ]
Liu, Jianrui [1 ,2 ]
Huang, Weidong [1 ,2 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[2] Northwestern Polytech Univ, Key Lab Met High Performance Addit Mfg & Innovat, MIIT China, Xian 710072, Peoples R China
[3] Qingdao Univ Technol, Shandong Engn Res Ctr Addit Mfg, Qingdao 266520, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2023年 / 204卷
基金：
中国国家自然科学基金;
关键词：
Additive manufacturing; Laser directed energy deposition; Inconel; 718; Transpassive film; Electrochemical dissolution; STAINLESS-STEEL; PASSIVE FILM; CORROSION BEHAVIOR; ANODIC-DISSOLUTION; PITTING CORROSION; NICKEL ELECTRODE; MECHANISM; MICROSTRUCTURE; KINETICS; SURFACE;
D O I：
10.1016/j.matchar.2023.113207
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study investigated the synergistic effect of transpassive film and gamma '' phase on the electrochemical dissolution behavior of Inconel 718 manufactured by laser directed energy deposition. The investigation was based on samples after homogenization and aging with (gamma + gamma '') phases and homogenization with. phase. The compositions of the transpassive films for two kinds of heat-treated samples were similar, mainly comprising porous Ni hydroxides. The incompact transpassive film induced the local preferential dissolution of the gamma matrix and generated multiple dispersive pits on the surface. Compared with the sample after homogenization, the spatial distribution of the gamma '' phase in the sample after homogenization and aging restricted the expansion of pits in the gamma matrix, leading to superior surface quality. The detachment of the gamma '' phase during electrochemical dissolution provided extra mass loss and higher current efficiency. A qualitative model was proposed to demonstrate the synergistic effect of the transpassive film and gamma '' phase on the dynamic electrochemical dissolution process.
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页数：13
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