In this study, we use the laser-assisted directed energy deposition (DED) method on an Inconel 901 plate to carefully examine the thermal behavior of the material. The thermal characteristics of the substrate are explained using both experimental and simulation methods. The laser's power, which ranges from 550 to 750 W, and its scanning speed, which varies between 6.67 and 10.0 mm/s, are among the variables covered by this study. For various laser powers and scanning speeds, we have thoroughly examined the duration of cooling which occurs between the melting and cooling periods in the area situated beneath the top surface of the substrate. Under various circumstances related to laser-assisted DED techniques, variations in temperature under the top surface of the substrate have also been calculated. Our results show that increased heat conduction from the heat source to the substrate causes the molten pool's lifetime to increase with increased laser power and decreased scanning speed. The conditions that operate at 550 W, 8.33 mm/s and 650 W, 10 mm/s have shorter molten pool lifetimes and faster cooling rates, resulting in smoother surfaces than the other conditions. The conclusions drawn from this work highlight how our study offers a deeper understanding of the internal melting and cooling processes that take place within the molten pool during laser-assisted DED methods.

在这项研究中，我们在 Inconel 901 板上使用激光辅助定向能量沉积 (DED) 方法来仔细检查材料的热行为。使用实验和模拟方法解释了基板的热特性。激光器的功率范围为 550 至 750 W，扫描速度范围为 6.67 至 10.0 mm/s，都是本研究涵盖的变量之一。对于各种激光功率和扫描速度，我们彻底检查了位于基板顶面下方区域的熔化和冷却周期之间发生的冷却持续时间。在与激光辅助 DED 技术相关的各种情况下，还计算了基板顶面下方的温度变化。我们的结果表明，从热源到基材的热传导增加会导致熔池的寿命随着激光功率的增加和扫描速度的降低而增加。以 550 W、8.33 mm/s 和 650 W、10 mm/s 运行的条件具有更短的熔池寿命和更快的冷却速率，从而比其他条件产生更光滑的表面。这项工作得出的结论强调了我们的研究如何更深入地了解激光辅助 DED 方法中熔池内发生的内部熔化和冷却过程。