Effect of current density on electrochemical machining process of laser powder bed fusion manufactured Inconel 718

被引:0
|
作者
Guo, Pengfei [1 ]
Martin, Andre [2 ]
Zhai, Changshuai [3 ]
Li, Zuo [4 ]
Lu, Xufei [4 ]
Yu, Jun [4 ]
Lin, Xin [4 ]
Odnevall, Inger [5 ]
Gibbons, Michael [1 ]
Schubert, Andreas [2 ]
机构
[1] Univ Dublin, Trinity Coll Dublin, Dept Mech Mfg & Biomed Engn, Dublin, Ireland
[2] Tech Univ Chemnitz, Fac Mech Engn, Professorship Micromfg Technol, D-09107 Chemnitz, Germany
[3] Qingdao Univ Technol, Shandong Engn Res Ctr Addit Mfg, Qingdao 266520, Peoples R China
[4] Northwestern Polytech Univ, State Key Lab Solidificat Proc, 127 Youyixilu, Xian 710072, Shaanxi, Peoples R China
[5] KTH Royal Inst Technol, Sch Engn Sci Chem Biotechnol & Hlth, Dept Chem, Div Surface & Corros Sci, Drottning Kristinas Vag 51, SE-10044 Stockholm, Sweden
基金
中国国家自然科学基金;
关键词
Laser powder bed fusion; Nickel-based superalloy; Electrolyte jet machining; Surface leveling; Leveling ratio; Transpassive dissolution behavior; SURFACE; REMOVAL; ECM;
D O I
10.1016/j.jmatprotec.2025.118748
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Electrolytic jet machining (EJM) has been widely recognized as one of the effective methods for the surface postprocessing of the laser powder bed fusion (LPBF)-components. However, this concept remains challenging due to the limited machining allowance of the LPBF-components and the complexed anodic dissolution behavior, which determine the dimensional accuracy and surface quality of the machined workpiece, respectively. In this work, high current densities ( >= 100 A/cm2) are novelly employed to investigate the leveling ratio and transpassive dissolution behavior of LPBF-Inconel 718 for the first time. Compared to 100 A/cm2, 200 A/cm2 improves the leveling ratio to 58.9 % from 57.1 % when the surface roughness is less than 1 mu m. However, the high current density up to 200 A/cm2 still cannot inhibit the selective dissolution of the inhomogeneous microstructure, which limits further reduction of the surface roughness. A high current density leads to a rougher micro-surface on horizontal section than low current density, caused by more Nb oxides attached on the horizontal section at high current density generate from continuously distributed Nb-segregation gamma phase along the machining depth direction. In addition, the local fine dendrites on vertical section result in a smooth EJM-surface, owing to the relatively uniform dissolution. This investigation provides systematic understanding of leveling process and transpassive dissolution behavior under high current density with complex surface and microstructure, which can further promote synergetic improvements of the surface integrity and dimensional tolerance through controlling the EJM parameters.
引用
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页数:13
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