Hong Min-Ho, Son Jun Sik, Kwon Tae-Yub
Institute for Biomaterials Research and Development, Kyungpook National University, Daegu 700-412, Republic of Korea.
Korea Textile Development Institute, Daegu 703-712, Republic of Korea.
J Nanosci Nanotechnol. 2018 Mar 1;18(3):2037-2040. doi: 10.1166/jnn.2018.14969.
The selective laser melting (SLM) process parameters, which directly determine the melting behavior of the metallic powders, greatly affect the nanostructure and surface roughness of the resulting 3D object. This study investigated the effect of various laser process parameters (laser power, scan rate, and scan line spacing) on the surface roughness of a nickel-chromium (Ni-Cr) alloy that was three-dimensionally (3D) constructed using SLM. Single-line formation tests were used to determine the optimal laser power of 200 W and scan rate of 98.8 mm/s, which resulted in beads with an optimal profile. In the subsequent multi-layer formation tests, the 3D object with the smoothest surface (Ra = 1.3 μm) was fabricated at a scan line spacing of 60 μm (overlap ratio = 73%). Narrow scan line spacing (and thus large overlap ratios) was preferred over wide scan line spacing to reduce the surface roughness of the 3D body. The findings of this study suggest that the laser power, scan rate, and scan line spacing are the key factors that control the surface quality of Ni-Cr alloys produced by SLM.
选择性激光熔化（SLM）工艺参数直接决定金属粉末的熔化行为，对所得三维物体的纳米结构和表面粗糙度有很大影响。本研究调查了各种激光工艺参数（激光功率、扫描速度和扫描线间距）对使用SLM三维构建的镍铬（Ni-Cr）合金表面粗糙度的影响。通过单线成型试验确定了200W的最佳激光功率和98.8mm/s的扫描速度，由此得到了具有最佳轮廓的熔珠。在随后的多层成型试验中，在扫描线间距为60μm（重叠率=73%）时制造出了表面最光滑（Ra = 1.3μm）的三维物体。为降低三维物体的表面粗糙度，较宽的扫描线间距相比，较窄的扫描线间距（以及因此更大的重叠率）更可取。本研究结果表明，激光功率、扫描速度和扫描线间距是控制SLM生产的Ni-Cr合金表面质量的关键因素。
