Journal
JOURNAL OF MANUFACTURING PROCESSES
Volume 40, Issue -, Pages 113-121Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jmapro.2019.03.018
Keywords
Selective laser melting; Biodegradable iron; Bone scaffolds; Microstructure
Categories
Funding
- School of Mechanical and Mining Engineering
- Queensland Centre for Advanced Materials processing and Manufacturing
- Australian Research Council Research Hub for Advanced Manufacturing of Medical Devices [IH150100024]
- European Union
- Regione Lombardia
- FESR
- Australian Research Council
- Repubblica Italiana
- Discover Early Career Researcher Award [DE160100260]
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Highly customisable implants with lattice structures can be achieved using selective laser melting (SLM) paving the way for tailored biodegradable Fe-based implants. For the first time, a systematic analysis is presented in terms of laser processing conditions required for scaffolds of pure Fe and a binary Fe-35 Mn alloy. The processability of the two materials were compared in terms of densification behaviour, surface roughness and geometrical error. Both materials were successfully processed into high quality scaffolds with excellent strut morphology and low processing porosity. The differences in the laser processing conditions between the pure metal and the binary alloy were discussed. The lower melting temperature of the Fe-35 Mn alloy required lower energy density for reaching the fully dense condition. Surface roughness and geometrical errors were found to be similar for the two materials. The microstructure of pure Fe was characterized by equiaxed alpha-ferrite grains, whereas the Fe-35 Mn had a microstructure consisting of columnar gamma grains, with each gamma-grain comprising of a network of individual cells.
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