【摘要】 激光直接沉积技术由于制造尺寸不受限制、材料自由度高，可用于制造大型金属零件，但常规激光直接沉积技术难以同时兼顾打印效率和打印质量，极大地限制了该技术的推广应用。为此，高速激光直接沉积技术成为了研究热点。本文探讨了扫描速度和激光功率对Inconel 718激光直接沉积工艺特性的影响，分析了常规和高速激光直接沉积的表面形貌、组织特征、内部缺陷和力学性能的变化规律，最后指出了将高速激光直接沉积技术应用于三维增材制造中所面临的挑战，为今后高速激光直接沉积技术的发展提供了方向。更多还原

【Abstract】 Laser direct deposition technology can be used for producing large metal parts due to its unlimited capacity for manufacturing size and high material freedom. However, conventional laser direct deposition technology makes it challenging to consider both printing efficiency and printing quality, thereby restricting the popularization and application of this technology. Therefore, high-speed laser direct deposition technology has gained research popularity. In this paper,the effects of scanning speed and laser power on the process characteristics of Inconel 718 laser direct deposition are discussed, and the changes in surface morphology, microstructure characteristics, internal defects, and mechanical properties of conventional and high-speed laser direct deposition are analyzed. Finally, the challenges of applying highspeed laser direct deposition technology in three-dimensional additive manufacturing are discussed, which offers guidance for the development of high-speed laser direct deposition technology in the future.更多还原