Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 252, Issue -, Pages 537-545Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2017.10.013
Keywords
Additive manufacturing; Polymers; Polyamide-12; Selective laser sintering; Round Robin; Porosity; Pore density; X-ray computed tomography
Funding
- German Research Foundation (DFG) [SFB 814/2]
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The mechanical properties of polymer parts built by Selective Laser Sintering are strongly related to the internal microstructure which differs with the applied production parameters. The paper focuses on the back tracing of the pore morphology of laser sintered polyamide-12 samples to the process parameters. Therefore, a data base is used which is supplied by a Round Robin initiative and includes mechanical tensile tests and the microstructural analysis of the pore morphology of several different sample charges built with different machines. The pore morphologies (porosity, pore density, pore shape and pore arrangement) measured by X-ray computed tomography are compared and discussed regarding the employed parameters and the resulting mechanical properties. The investigations point out that pore density is a superior indicator than porosity for mechanical issues. This is especially valid along the build direction since pore morphology has shown to be strongly anisotropic. Moreover, the analysis revealed that pore density is strongly affected by the process temperature, which is proved to be essential for the fabrication of mechanical robust parts using Selective Laser Sintering.
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