Characterization of 100Cr6 lattice structures produced by robocasting. (5th May 2017)

• Record Type: Journal Article
• Authors: Yetna N'Jock, M.; Camposilvan, E.; Gremillard, L.; Maire, E.; Fabrègue, D.; Chicot, D.; Tabalaiev, K.; Adrien, J.
• Is Part Of: Materials & design. Volume 121(2017)
• Page Start: 345
• Page End: 354
• Publication Date: 2017-05-05
• Subjects: Additive manufacturing -- Robocasting -- Mercury intrusion porosimetry -- X-ray micro-tomography -- Microstructural characterization -- Mechanical properties; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2017.02.066
• Languages: English
• ISSNs: 0264-1275

Abstract

Highlights: Lattice structures of 100Cr6 steel are fabricated from metal-based ink by robocasting using Pluronic F-127 solution The proposed ink formulation promoted sintering of printed parts The optimization of the heat treatment allowed to reduce the porosity in the printed parts Interesting mechanical properties are obtained both at a local level and at the architecture level Dense parts are obtained with a regular macroporosity which do not require a complex formulation as reported in literature Graphical Abstract: Abstract: Lattice structures of 100Cr6 steel were manufactured from metallic-based inks by robotic-assisted deposition (robocasting) using Pluronic F-127 solution. The stability and pseudo-plastic behavior of the ink were optimized, and allowed printing through 200–840 μm nozzles, leading to macroporous architectures composed of 300–600 μm diameter rods separated by 90–350 μm pores, after debinding and sintering. A second level of porosity (sub-micron size) was controlled by adjusting the sintering temperature. The linear shrinkage due to drying and thermal consolidation was evaluated from images obtained by micro-tomography and volumes measured by mercury intrusion porosimetry. Whatever the thermal treatments, the microstructure was always mainly composed of ferrite – α. The mechanical properties were estimated both at a local level (Young modulus and hardness of the rods by nanoindentation, coherent with those of 100Cr6 steel) and at the architecture level (stress-strain curve of the structures, showing a plastic behavior related to a good consolidation of the structure). Thus, dense metallic lattice structures with a regular macroporosity and interesting mechanical properties can be easily obtained with these water-based metallic inks, which do not require a complex formulation nor high organic content as reported in literature.