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Energy Input Effect on Morphology and Microstructure of Selective Laser Melting Single Track from Metallic Powder
Université de Lyon, Ecole Nationale d'Ingénieurs de Saint-Etienne (ENISE), Saint-Etienne, France.
Dept of Mechanical ang Materials Engineering, Karlstad University.
Université de Lyon, Ecole Nationale d'Ingénieurs de Saint-Etienne (ENISE), Saint-Etienne, France.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
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2013 (English)In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 213, no 4, 606-613 p.Article in journal (Refereed) Published
Abstract [en]

Process parameters of selective laser melting affect the response of a powder–substrate system and, therefore, the geometry and microstructure of the manufactured parts. The experiments were carried out at fixed values of laser power (50 W), spot diameter (70 μm) and powder layer thickness (80 μm). In this research, influence of the energy input parameters (80–900 °C preheating temperature and 0.08–0.28 m/s laser scanning speed) on microstructure and geometry of single tracks fabricated of stainless steel grade 316L powder was analysed. Both factors were found statistically significant with regard to their influence on the remelted depth and the primary cell spacing in the colonies observed in the tracks cross-sections. More specifically, the contact angle and track height were controlled by the preheating temperature, and track width and contact zone characteristics were governed by the laser scanning speed. Because of the threshold behaviour of these two factors, values starting with 700 °C and 0.24 m/s were found not optimal and causing instability and balling effect. Conclusions regarding the selection of process parameters for the formation of tracks with the desired geometry and microstructure were formulated based on statistical analysis of the experimental data.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 213, no 4, 606-613 p.
Keyword [en]
Selective laser melting, powder processing steel, solidification microstructure
National Category
Engineering and Technology Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-87688DOI: 10.1016/j.jmatprotec.2012.11.014ISI: 000315311300011OAI: oai:DiVA.org:liu-87688DiVA: diva2:597296
Available from: 2013-01-24 Created: 2013-01-22 Last updated: 2017-12-06Bibliographically approved

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Johansson, Sten

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