The improvement of the density with functional microstructure is still a challenge in the Selective Laser Melting process considering the laser processing parameters. In this study, the pore formation mechanisms and microstructural changes caused by the effects of laser power and track overlap during the manufacturing process in selective laser melting were examined. Laser power played a crucial role in the geometry and quantity of keyhole pore formation and thus in improving density and quality. In contrast, a slightly higher track overlap led to a significant reduction in porosity, resulting in the production of fully dense samples of a Ti-6Al-4V alloy. The gradual variations in the solid-state phase transformation architecture occurred with variations in laser power and track overlap due to the use of different thermal mechanisms. The associated scanning speeds also significantly affected the microstructural architectures in some states. The melt pool dynamics and thermal properties that influenced the metallurgical properties of the samples are analyzed and interpreted. The analysis of the presented consequences can help the engineers to produce high density products together with functionally graded materials.

考虑到激光加工参数，利用功能性微结构提高密度仍然是选择性激光熔融工艺中的一个挑战。在这项研究中，研究了在选择性激光熔化的制造过程中，由激光功率和轨迹重叠造成的孔形成机理和微观结构变化。激光功率在锁孔形成的几何形状和数量中起着至关重要的作用，因此在提高密度和质量方面起着至关重要的作用。相反，略微较高的轨迹重叠会导致孔隙率显着降低，从而导致生成Ti-6Al-4V合金完全致密的样品。固态相变架构的逐渐变化是由于使用不同的热机制而导致的激光功率和轨道重叠的变化。在某些状态下，相关的扫描速度也显着影响了微结构的结构。分析和解释了影响样品冶金性能的熔池动力学和热性能。对提出的后果进行分析可以帮助工程师与功能分级的材料一起生产高密度产品。