激光立体成形(LSF)—电解加工(ECM)复合制造技术可实现大型复杂结构高效、轻量化制造，在航空发动机制造中应用前景广阔。但是，LSF镍基高温合金组织中γ基体/第二相/偏析区三元体系溶解行为差异使得表面质量较差，这极大的限制了该技术的发展。脉冲电解加工(PECM)作为最终加工可显著提高表面质量，但是其对该体系溶解行为的作用机理尚不清晰。本课题拟以发动机中应用广泛的Inconel 718作为研究对象，系统研究LSF Inconel 718组织特征、PECM表面质量及表层剖面结构，建立偏析行为和第二相特征与LSF工艺之间的理论模型，明晰PECM工艺对LSF表面质量的影响规律，揭示脉冲电流对三元体系微区阳极溶解行为的作用机理，阐明PECM表面质量提高的内在本质，解决LSF-ECM复合制造表面质量差的问题。本研究有望为LSF-ECM复合制造大型镍基高温合金结构在航空发动机上的应用提供新思路。

Laser solid forming (LSF) & electrochemical machining (ECM) hybrid manufacturing technology can realize the high-efficiency and lightweight manufacturing of the large-scale complex components, exhibiting a promising prospects in aero-engine. However, the anodic dissolution behavior difference of a ternary system of γ matrix/second phases/segregation area in LSF nickel-based superalloys leads to inferior surface quality, which has extremely limited the development of this hybrid manufacturing technology. Pulsed electrochemical machining (PECM) can significantly improve the surface quality as the last procedure, but the mechanism of the pulse current on the dissolution behavior of the system remains unclear. This project takes the Inconel 718 as the research object, investigates the as-deposited Inconel 718 microstructure features, surface quality and sectional structure after PECM systematically, develops the theoretical model between segregation, the second phases and LSF process, clears the influencing rules of PECM process on the surface quality of the as-deposited part, reveals the mechanism of the pulse current action on micro-area anodic dissolution behavior, clarifies the nature of improving surface quality by PECM, solves the difficulty of inferior surface quality caused by LSF-ECM hybrid manufacturing technology. This present research can provide a new idea for applying LSF-ECM hybrid manufacturing technology to manufacture large-scale nickel-based superalloys components in aero-engine.