Print Email Facebook Twitter Effects of processing on microstructure and properties of SLS Nylon 12 Title Effects of processing on microstructure and properties of SLS Nylon 12 Author TNO Industrie en Techniek Zarringhalam, H. Hopkinson, N. Kamperman, N.F. Vlieger, J.J.de Publication year 2006 Abstract There currently exists the requirement to improve reproducibility and mechanical properties of SLS Nylon parts for rapid manufacturing (RM). In order to achieve this, further fundamental research is needed and this paper addresses this need by investigating effects of potential sources of the lack of reproducibility and reports effects in relation to crystal structure, microstructure, chemical structure (molecular weight) and mechanical properties. Different γ crystal forms were identified and related to the unmolten particle cores and the melted/crystallised regions of the microstructure. The melt point of the γ-form varied depending on processing conditions. Observable differences were also present when comparing the microstructure of the parts. Molecular weight of parts was significantly higher than virgin powder but used powder also showed an increase in molecular weight. This was related to improved elongation at break of parts built from the used powder, consistent with previous studies. Tensile strength showed some increase with machine parameters selected for improved strength but Young's modulus values were broadly similar. Subject Crystal structureMicrostructureMolecular weightNylon 12Selective laser sintering To reference this document use: http://resolver.tudelft.nl/uuid:49baf8ab-044d-4f66-9a0a-05961ddc9264 DOI https://doi.org/10.1016/j.msea.2006.07.084 TNO identifier 239583 Publisher Elsevier ISSN 0921-5093 Source Materials Science and Engineering A, 435-436 (435-436), 172-180 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.