SLM激光单道扫描成型纯钨薄壁件的研究

本文通过选区激光熔化技术激光单道扫描成型了纯钨薄壁件，通过二维影像仪和光学显微镜分别测量了成型薄壁壁厚和熔化道宽度，研究了激光功率和扫描速率对成型纯钨薄壁壁厚和熔化道宽度的影响。通过光学显微镜观察了成型薄壁表面2D和3D形貌。通过扫描电镜观察了成型薄壁侧面粘粉情况，并分析了粘粉的原因。研究结果表明，成型薄壁壁厚要大于熔化道宽度；随着激光功率的增大，薄壁壁厚和熔化道宽度逐渐增大，薄壁表面逐渐变得平坦；随着扫描速率的增大，薄壁壁厚和熔化道宽度逐渐减小，熔化道由扭曲变得平直再变得扭曲，熔化道高度方向上的高度差先减小后增大；纯钨薄壁由完全熔化区、球化区、半熔化区和未熔化区四部分组成。

Research on Pure Tungsten Thin Wall Part Fabricated by Laser Single Track Scanning via SLM

This paper fabricated pure tungsten thin wall parts by laser single track scanning via SLM. The wall thickness and molten trace width were measured by two-dimensional imager and optical microscope, respectively, and the influence of laser power and scanning rate on the wall thickness and molten trace width were investigated. The surface 2D and 3D morphology of thin walls were detected by optical microscope. The powder adhesion on the side surface of the thin wall was detected by scanning electron microscope and the reason for powder adhesion was analyzed. The results indicated that the walls thickness was greater than molten trace width. With the increase of laser power, the wall thickness amd molten trace width increased, the surface of thin wall became smooth. With the increase of scanning rate, the wall thickness and molten trace with decreased, the molten trace became twisted first and then straight, and twisted again, the height difference of the molten trace decreased first and then increased. The thin wall consisted of complete melting zone, balling zone, semi-melting zone and unmelted zone.