Investigation into the effect of process parameters on microstructural and physical properties of 316L stainless steel parts by selective laser melting
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Additive manufacturing by selective laser melting (SLM) was used to investigate the effect of laser energy density on 316L stainless steel properties. Point distance and exposure time were varied and their impact on porosity, surface finish, microstructure, density and hardness, was evaluated. The surface roughness was primarily affected by point distance with increased point distance resulting in increased surface roughness, R a, from 10 to 16 μm. Material hardness reached a maximum of 225 HV at 125 J/mm3 and was related to the material porosity; with increased porosity leading to decreased material hardness. Different types of particle coalescence leading to convex surface features were observed (sometimes referred to as balling); from small ball features at low laser energy density to a mixture of both small and large ball features at high laser energy density. Laser energy density was shown to affect total porosity. The minimum amount of porosity, 0.38 %, was observed at an energy density of 104.52 J/mm3.
KeywordsAdditive manufacture Microstructure 316L Stainless steel Porosity Laser energy Selective laser melting
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- 1.Kruth J P, Badrossamay M, Yasa E, Deckers J, Thijs L, Humbeeck J V (2010) Part and material properties in selective laser melting of metals, in 16th International symposium on electromachining (ISEM XVI), doi: https://lirias.kuleuven.be/handle/123456789/265815
- 4.Mathisen M B (2012) "In-situ tensile testing combined with EBSD analysis of Ti-6Al-4V samples from components fabricated by additive layer manufacture," Materials Science and Engineering, Submitted June 2012, doi: http://www.diva-portal.org/smash/record.jsf?pid=diva2:566362
- 6.Gebhardt A, Schmidt FM, Hotter JS, Sokalla W, Sokalla P (2010) "Additive manufacturing by selective laser melting the realizer desktop machine and its application for the dental industry," in Laser Assisted Net Shape Engineering 6, Proceedings of the LANE 2010, Part 2, doi: http://dx.doi.org/10.1016/j.phpro.2010.08.082
- 13.Ekrami Y, Forth S C and Waid M C, "Characterization of electron beam free-form fabricated 2219 aluminum and 316 stainless steel", Technical Report, NASA, USRP, doi: http://ntrs.nasa.gov/search.jsp?R=20110008207
- 23.Campanelli SL, Contuzzi N, Angelastro A, Ludovico AD (2010) Capabilities and performances of the selective laser melting process, new trends in technologies: devices, computer, communication and industrial systems, M. J. Er, Ed., Open Access Book, DOI: http://www.intechopen.com/books/howtoreference/new-trends-in-technologies--devices--computer--communication-and-industrial-systems/capabilities-and-performances-of-the-selective-laser-melting-process