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Effects of processing on microstructure and properties of SLS Nylon 12

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journal contribution
posted on 30.07.2008, 09:25 by Hadi Zarringhalam, Neil Hopkinson, N.F. Kampermanb, J.J. de Vlieger
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.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

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]

Publisher

© Elsevier

Publication date

2006

Notes

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

ISSN

0921-5093

Language

en