The characteristics of single-track melt pools, such as size, shape, and stability, formed by the heatresistant Inconel 718 nickel alloy powder subjected to selective laser melting (SLM) were studied. The objective was to determine the range of optimal SLM parameters to provide a stable track with a depth of two to three layers. Single tracks were built using various combinations of process parameters: laser power from 50 to 400 W with a step of 30 W and scanning speed from 450 to 1000 mm/sec with a step of 50 mm/sec (144 modes in total). An Axiovert 200M MAT light microscope (Carl Zeiss) was employed to examine the cross sections of single tracks and evaluate the geometrical parameters of the melt pools. Features pertaining to the effect of the scanning speed and laser power on single-track depth and width and their ratio were experimentally studied. An unstable track formed at low power (P = 50 W) and low scanning speed (V = 450–500 mm/sec), while no track appeared at all at higher speeds. A stable track formed at power P = 80–200 W at low speeds (V = 500–900 mm/sec) and became unstable and intermittent when speed increased to V = 1000 mm/sec. With higher laser power (P = 230–400 W) and low process speeds, a continuous track formed but had an increased variable width, being indicative of a deviation from the stable track formation conditions. It was first established that the intensity of the scanning speed effect (450–1000 mm/sec) on the single track depth varies by more than 2.5 times depending on the laser power (50–400 W). The process parameters that would ensure the formation of an optimal single track in terms of geometric parameters were determined.

研究了由耐热Inconel 718镍合金粉末经过选择性激光熔化（SLM）形成的单道熔池的特性，例如尺寸，形状和稳定性。目的是确定最佳SLM参数的范围，以提供深度为两到三层的稳定轨道。使用各种工艺参数组合来构建单轨道：激光功率从50到400 W，步长为30 W，扫描速度从450到1000 mm / s，步长为50 mm / sec（总共144个模式）。使用Axiovert 200M MAT光学显微镜（卡尔·蔡司）检查单条轨迹的横截面并评估熔池的几何参数。实验研究了扫描速度和激光功率对单道深度和宽度及其比率的影响。在低功率（P = 50 W）和低扫描速度（V = 450-500 mm / sec）下形成了不稳定的轨迹，而在更高的速度下根本没有轨迹出现。在低速（V = 500-900 mm / sec）时，功率P = 80-200 W时会形成稳定的轨迹，当速度提高到V = 1000 mm / sec时，轨迹会变得不稳定且断断续续。在较高的激光功率（P = 230–400 W）和较低的处理速度下，形成了连续的磁道，但可变宽度增加，表明偏离了稳定的磁道形成条件。最初确定的是，取决于激光功率（50-400 W），单轨道深度上的扫描速度效应（450-1000 mm / sec）的强度相差2.5倍以上。