Laser manufacturing is widely used in modern industries for its high efficiency and accuracy. In the present work, the microstructures and mechanical properties of the laser-induced recast material on nickel-based superalloy Inconel 718 were systematically investigated. The mechanical property of the recast material was investigated with the help of the instrumented indentation technique improved by the reverse analysis algorithm. The yield strength and microhardness in the recast zone are much lower than that of the base material, which is attributed to the epitaxial growth of columnar grains and more to the decrease of strengthening phases ${\gamma }^{\prime }$ and ${\gamma }^{″}$. Whereas the recast-affected zone reveals higher yield strength for the growth of strengthening twins, the partial dissolution of the $\delta$ phase and cold work hardening manifested by higher misorientations. The high cycle fatigue performance of the recast material reduces significantly, which is caused by microstructural changes and defects including interval cavities and surface micro-cracks distributed in the recast zone.

激光制造以其高效率和高精度在现代工业中被广泛使用。在目前的工作中，系统地研究了镍基超合金Inconel 718上激光诱导的铸造材料的微观结构和力学性能。借助反向分析算法改进的仪器压痕技术，研究了重铸材料的机械性能。重铸区的屈服强度和显微硬度远低于母材，这归因于柱状晶粒的外延生长和强化相的减少。${\gamma }^{\prime }$ 和 ${\gamma }^{\text{'}\text{'}}$。受重铸影响的区域对加强孪晶的生长显示出更高的屈服强度，而双子的部分溶解$\delta$方向错误会导致相变和冷作硬化。重铸材料的高周疲劳性能显着降低，这是由于微观结构的变化和缺陷（包括在重铸区中分布的间隔腔和表面微裂纹）引起的。