【摘要】 采用金相显微镜、扫描电镜、氧氮分析仪、激光粒度分析仪和X射线衍射仪等分析手段对等离子旋转电极雾化法（PREP)制备的M50NiL金属粉末进行了显微形貌、物相组成、氮氧含量、粒径分布以及流动性等特征参数分析。结果表明：粉末的粒径范围较窄，主要分布在30～53μm之间，粒径分布呈现单峰分布，粒径分布曲线呈正态分布，平均粒径为45.21μm。粉末化学成分均匀，纯度高，无其他杂质；金属粉末氮氧含量低，氧元素质量分数小于0.024%，氮元素质量分数低于0.025%。M50NiL粉末均主要由α相组成；凝固组织随粒径的变化而变化；粒径处于15～53μm的粉末凝固组织为细小的胞状晶和枝晶组织，粒径在53～150μm范围的粉末凝固组织为树枝晶组织，粒径大于150μm的粉末凝固组织为粗大的等轴晶。M50NiL粉末物理性能优异，满足粉床熔融增材制造技术要求。更多还原

【Abstract】 Using metallographic microscope, scanning electron microscope, oxygen-nitrogen analyzer, laser particle size analyzer, and X-ray diffraction analyzer, the characteristics of M50NiL powder prepared by plasma rotating electrode process(PREP), including the microstructure and phase composite, nitrogen-oxygen content, particle size distribution, and flowability were characterized. The results indicate that the powder has a relatively narrow particle size range, primarily distributed between 30-53 μm, with a unimodal distribution and a Gaussian distribution curve. The average particle size is 45.21 μm. The chemical composition of the powder is uniform, with high purity and no other impurities. Metal powder has low nitrogen-oxygen content with the below 0.024% of the oxygen and the below 0.025% of the nitrogen. The M50NiL powder with different particle sizes are primarily composed of α phase. The solidification structure varies with the change of the particle size: 15-53 μm consists of fine cellular and dendritic structures, whereas 53-150 μm is dendritic, and >150 μm is characterized by coarse equiaxed crystal structures. M50NiL powder has excellent physical properties and meets the technical requirements of powder bed fusion additive manufacturing.更多还原