As a result of their excellent creep strength at high temperatures, oxide dispersion strengthened alloys are attractive candidates as structural materials for high temperature applications. However, traditional production processes encounter several challenges when producing complex shape. This study employed a single/multi-track process optimization approach for the preparation of oxide dispersion strengthened nickel-based superalloy by laser metal deposition. A multi-objective optimization method (power, scanning speed, powder feed rate) was adopted in the preparation process to improve the dilution, wetting angle, powder capture efficiency and hardness of the single-track. The Taguchi method-Principal component analysis-Gray relational analysis-Response surface methodology was used to optimize the characteristics of single-track. Thermocapillary convection drives the motion of gas bubbles in single-track depositions, while surface pores typically cluster along the track edge. The microstructure and crack of multi-track are optimized by overlapping ratio. In order to investigate the effect of the transition from columnar to equiaxed, the microstructure of the laser-deposited bulk specimen was studied. The results verify the feasibility of multi-objective process optimization in track and present experience for the application of microstructure and mechanical properties of track process optimization laser-deposited sample.

由于它们在高温下具有优异的蠕变强度，氧化物弥散强化合金是用于高温应用的结构材料的有吸引力的候选者。然而，传统的生产工艺在生产复杂形状时会遇到一些挑战。本研究采用单道/多道工艺优化方法通过激光金属沉积制备氧化物弥散强化镍基高温合金。在制备过程中采用多目标优化方法（功率、扫描速度、送粉速度）来提高单轨的稀释度、润湿角、粉末捕获效率和硬度。采用田口法-主成分分析-灰色关联分析-响应面法对单轨特性进行优化。热毛细对流驱动气泡在单轨沉积中的运动，而表面孔隙通常沿轨道边缘聚集。通过重叠比对多轨的微观结构和裂纹进行了优化。为了研究从柱状到等轴状转变的影响，研究了激光沉积块状试样的微观结构。结果验证了轨道多目标工艺优化的可行性，并为轨道工艺优化激光沉积样品的微观结构和力学性能的应用提供了经验。为了研究从柱状到等轴状转变的影响，研究了激光沉积块状试样的微观结构。结果验证了轨道多目标工艺优化的可行性，并为轨道工艺优化激光沉积样品的微观结构和力学性能的应用提供了经验。为了研究从柱状到等轴状转变的影响，研究了激光沉积块状试样的微观结构。结果验证了轨道多目标工艺优化的可行性，并为轨道工艺优化激光沉积样品的微观结构和力学性能的应用提供了经验。