The recyclability of 316L stainless steel powder in the binder jetting process has been determined. The powder characterization results demonstrated a 22% increase in the number of coarse particles (> 30 µm) and an 18.2% reduction in the number of small particles (< 10 µm) after recycling up to 16 times. A few elongated and irregular-shaped particles were found after recycling, possibly due to particle agglomeration during handling and sieving. A negligible increase in the oxygen content by 0.036% was detected in the recycled powder. The density of sintered parts produced using recycled powder was approximately 1.5% lower than when using fresh powder due to the changes in the particle size distribution and the flowability of the powder caused by the changes in morphology. Final parts built using fresh and recycled powder showed similar hardness (155 ± 3 HV and 165 ± 9 HV) and yield strength (206 ± 16 MPa and 192 ± 10 MPa), respectively.

中文翻译：

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粘合剂喷射增材制造中的金属粉末可回收性

确定了在粘合剂喷射过程中316L不锈钢粉末的可回收性。粉末表征结果证实在粗颗粒的数目增加了22％（> 30  μ M）和小颗粒的数量的18.2％减少（<10  μm）回收后最多16次。回收后发现了一些细长且形状不规则的颗粒，这可能是由于处理和筛分过程中的颗粒团聚所致。在回收的粉末中，氧含量的增加量可忽略不计0.036％。使用再生粉末制成的烧结零件的密度比使用新鲜粉末时的密度低约1.5％，这是由于粒径分布的变化和由形态变化引起的粉末的流动性。使用新鲜粉末和再生粉末制成的最终零件分别显示出相似的硬度（155±3 HV和165±9 HV）和屈服强度（206±16 MPa和192±10 MPa）。