Laser sintering (LS) of polyamide 12 (PA12) is increasingly being adopted for industrial production of end-use parts, yet the complexity of this process coupled with the lack of organized, rigorous, publicly available process-structure-physical property datasets exposes manufacturers and customers to risks of unacceptably poor part quality and high costs. Although an extensive scientific literature has been developed to address some of these concerns, results are distributed among numerous reports based on different machines, materials, process parameters, and users. In this study, a single commercially important LS PA12 feedstock has been processed along four build dimensions of a modern production LS machine, characterized by a wide range of physical techniques, and compared to the same material formed by conventional melt processing. Results are discussed in the context of the literature, offering novel insights including distributions of particle size and shape, localization of semicrystalline phase changes due to LS processing, effect of chemical aging on melt viscosity, porosity orientation relative to LS build axes, and microstructural effects on tensile properties and failure mechanisms. The resulting datasets will be made publicly available to modelers and practitioners for the purpose of improving certifiability and repeatability of end-use parts manufactured by LS.

中文翻译：

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AMB2018-04：聚酰胺12粉末床熔融增材制造的基准物理性能测量

聚酰胺12（PA12）的激光烧结（LS）越来越多地用于最终用途零件的工业生产，但是此过程的复杂性以及缺乏有组织的，严格的，公开的过程-结构-物理特性数据集使制造商暴露并给客户带来零件质量差，成本高的风险。尽管已经开发了广泛的科学文献来解决其中的一些问题，但结果是根据不同的机器，材料，工艺参数和用户在众多报告中分配的。在这项研究中，已沿现代生产LS机器的四个构造尺寸加工了一种具有商业意义的LS PA12原料，其特征是具有广泛的物理技术，并且与通过常规熔体加工形成的相同材料进行了比较。在文献中讨论了结果，提供了新颖的见解，包括粒径和形状的分布，由于LS加工导致的半结晶相变的局部性，化学时效对熔体粘度的影响，相对于LS构建轴的孔隙取向以及微结构效应关于拉伸性能和破坏机理。结果数据集将公开提供给建模者和从业者，以提高LS制造的最终用途零件的可认证性和可重复性。以及微观结构对拉伸性能和破坏机理的影响。结果数据集将公开提供给建模者和从业者，以提高LS制造的最终用途零件的可认证性和可重复性。和微观结构对拉伸性能和破坏机理的影响。结果数据集将公开提供给建模者和从业者，以提高LS制造的最终用途零件的可认证性和可重复性。