The particle shape influences the part properties in laser powder bed fusion, and powder flowability and powder layer density (PLD) are considered the link between the powder and part properties. Therefore, this study investigates the relationship between these properties and their influence on final part density for six 1.4404 (316L) powders and eight AlSi10Mg powders. The results show a correlation of the powder properties with a Pearson correlation coefficient (PCC) of −0.89 for the PLD and the Hausner ratio, a PCC of −0.67 for the Hausner ratio and circularity, and a PCC of 0.72 for circularity and PLD. Furthermore, the results show that beyond a threshold, improvement of circularity, PLD, or Hausner ratio have no positive influence on the final part density. While the water-atomized, least-spherical powder yielded parts with high porosity, no improvement of part density was achieved by feedstock with higher circularities than gas-atomized powder.

中文翻译：

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激光粉末床熔合过程中颗粒形状，粉末流动性和粉末层密度对部件密度的影响

颗粒形状会影响激光粉末床熔合的零件性能，并且粉末流动性和粉末层密度（PLD）被认为是粉末与零件性能之间的联系。因此，本研究调查了六种1.4404（316L）粉末和八种AlSi10Mg粉末的这些性质及其对最终零件密度的影响之间的关系。结果表明，粉末性质的相关性如下：对于PLD和Hausner比，Pearson相关系数（PCC）为-0.89，对于Hausner比和圆度，PCC为-0.67，对于圆度和PLD，PCC为0.72。此外，结果表明，超过阈值，圆度，PLD或Hausner比的提高对最终零件密度没有积极影响。虽然水雾化的最小球形粉末产生的零件具有高孔隙率，