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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/3500

Title: Effects of processing on microstructure and properties of SLS Nylon 12
Authors: Zarringhalam, Hadi
Hopkinson, Neil
Kampermanb, N.F.
Vlieger, J.J. de
Keywords: Rapid manufacturing
Selective laser sintering
Crystal structure
Molecular weight
Issue Date: 2006
Publisher: © Elsevier
Citation: ZARRINGHALAM, H. ... et al, 2006. Effects of processing on microstructure and properties of SLS Nylon 12. Materials science and engineering A, 435-436, pp. 172-180 [DOI:10.1016/j.msea.2006.07.084]
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 (i.e. build procedure/parameters and powder blend) 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 un-molten particle cores and the molten/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 (powder already held at elevated temperature) 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 parameters selected for improved strength but Young’s modulus values were broadly similar.
Description: This is a journal article. It was published in the journal, Materials Science and Engineering: A [© Elsevier] and the definitive version is available at: http://www.sciencedirect.com/science/journal/09215093
URI: https://dspace.lboro.ac.uk/2134/3500
ISSN: 0921-5093
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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