Chen Jibing, She Yong, Du Xinyu, Liu Yanfeng, Yang Yang, Yang Junsheng
School of Mechanical Engineering, Wuhan Polytechnic University Wuhan 430023 China
RSC Adv. 2024 Jan 19;14(5):3202-3208. doi: 10.1039/d3ra08627e. eCollection 2024 Jan 17.
Selective laser melting (SLM) additive manufacturing technology with different oxygen contents leads to the appearance of spherical solids of different sizes on the surface of the part, which affects the mechanical properties of the part, surface roughness, In this study, the SLM molding technique was applied using three different 316L metal powders with different oxygen contents. The spheroidization properties and morphology of the samples were observed using a Quanta 200 environmental scanning electron microscope (ESEM), and the samples were observed microscopically and subjected to EDX spectroscopy using metallographic microscopy, and the mechanical properties were investigated. The results of the study showed that when using gas atomized powders, no spheroidization occurred when the oxygen content of the powders was 5.44 ± 0.01% in all cases, whereas using water atomized powders produced spherical structures with larger dimensions. This observation was closely related to the shape and particle size of the powder. When 316L metal powder with an oxygen content of 4.52 ± 0.01% was used for molding, small spherical structures appeared on the surface of the samples. When metal powder with an oxygen content of 5.44 ± 0.01% was used for the molding, larger spherical structures appeared on the surface of the samples. When the powder with an oxygen content of 5.90 ± 0.01% was used for the molding, more small spherical structures and some large spherical structures appeared on the surface of the samples. This suggests that higher oxygen levels may inhibit the occurrence of spheroidization. EDX spectroscopic analysis revealed that the white matter on the surface of the samples without spheroidization was mainly composed of Fe and Cr, whereas the white matter on the surface of the large-sized spherical structures was mainly composed of Si and Mn, which may be related to the oxygenophilicity of the various substances.
具有不同氧含量的选择性激光熔化（SLM）增材制造技术会导致零件表面出现不同尺寸的球形固体，这会影响零件的机械性能和表面粗糙度。在本研究中，使用三种不同氧含量的316L金属粉末应用了SLM成型技术。使用Quanta 200环境扫描电子显微镜（ESEM）观察样品的球化特性和形态，并使用金相显微镜对样品进行微观观察和能谱分析，并研究其机械性能。研究结果表明，使用气雾化粉末时，在所有情况下，当粉末的氧含量为5.44±0.01%时不会发生球化，而使用水雾化粉末会产生尺寸更大的球形结构。这一观察结果与粉末的形状和粒径密切相关。当使用氧含量为4.52±0.01%的316L金属粉末进行成型时，样品表面出现了小的球形结构。当使用氧含量为5.44±0.01%的金属粉末进行成型时，样品表面出现了更大的球形结构。当使用氧含量为5.90±0.01%的粉末进行成型时，样品表面出现了更多的小球形结构和一些大球形结构。这表明较高的氧含量可能会抑制球化的发生。能谱分析表明，未发生球化的样品表面的白色物质主要由Fe和Cr组成，而大尺寸球形结构表面的白色物质主要由Si和Mn组成，这可能与各种物质的亲氧性有关。
