Refractory high-entropy alloys (RHEAs) are a new category of high-temperature materials that are high-entropy alloys with refractory metal elements as the major components. SLM technique provides distinct benefits in preparing refractory metals with high melting points. The effects of laser power and scanning speed on the surface morphology and internal defects of VNbMoTaW RHEAs samples were examined using numerical and experimental methods. A DEM-CFD model was created to simulate the process of SLM producing a single-layer, single-track model. The simulation findings show that the melt pool's channel width is 62.31 μm at a scanning speed of 300 mm/s and a laser power of 150 W. The channel width grows to 96.92 μm when the laser power rises to 450 W. When the laser power is increased, the channel becomes flatter. To prepare the VNbMoTaW samples, the process parameters with the highest quality in the numerical simulation were chosen. At a scanning speed of 300 mm/s and a laser power of 450 W, the measured channel width of the high-entropy alloy samples is approximately 104.13 m. Similarly to the numerical simulation results, the channel width of the models generated at the same scanning speed increases as the laser power increases. At low laser power, it was discovered that many unmelted powder particles were dispersed on the surface of the samples. The primary defects found in the samples were pores and fractures. The interlayer non-melting cracks on the sample cross-section vanish at elevated laser power. Whereas the quality of samples created at low scanning speeds is higher at the same laser power, the quality of samples declines as the scanning speed of the laser increases.

难熔高熵合金（RHEA）是一类新型高温材料，是以难熔金属元素为主要成分的高熵合金。SLM 技术在制备高熔点难熔金属方面具有明显的优势。采用数值和实验方法研究了激光功率和扫描速度对 VNbMoTaW RHEA 样品表面形貌和内部缺陷的影响。创建 DEM-CFD 模型来模拟 SLM 生成单层、单轨模型的过程。模拟结果表明，在扫描速度为300 mm/s、激光功率为150 W时，熔池的通道宽度为62.31 μm。当激光功率升至450 W时，通道宽度增长至96.92 μm。增加，通道变得更平坦。为了制备 VNbMoTaW 样品，选择了数值模拟中质量最高的工艺参数。在扫描速度为300 mm/s、激光功率为450 W时，测得高熵合金样品的通道宽度约为104.13 m。与数值模拟结果类似，相同扫描速度下生成的模型的通道宽度随着激光功率的增加而增加。在低激光功率下，发现许多未熔化的粉末颗粒分散在样品表面。样品中发现的主要缺陷是气孔和裂缝。样品横截面上的层间非熔化裂纹在激光功率升高时消失。虽然在相同激光功率下以低扫描速度创建的样品质量较高，但随着激光扫描速度的增加，样品质量会下降。