期刊
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
卷 110, 期 7-8, 页码 1911-1921出版社
SPRINGER LONDON LTD
DOI: 10.1007/s00170-020-05949-9
关键词
Additive manufacturing; Aluminium alloy; Maraging steel; Selective Laser Melting; Porosity; Energy density
资金
- Universita degli Studi di Padova within the CRUI-CARE Agreement
- Regione Friuli Venezia Giulia [FESR D23D18000160007]
Soundness of additively manufactured parts depends on a lot of process and geometrical parameters. A wrong process design leads to defects such as lack of fusion or keyhole porosity that have a detrimental effect on the mechanical properties of the printed parts. Process parameter optimization is thus a formidable challenge that requires in general a huge amount of experimental data. Among the others, heat source power and scan speed are the most defects-affecting parameters to be optimized. The energy density is used in literature to quantify their combination. Unfortunately, in different works it was demonstrated that it fails if used as design parameter mainly because it does not take into account the material properties and the interaction between heat source and the powder bed. In this contribution, a modified volumetric energy density equation that takes into account the powder-heat source interaction to optimize the combination of power-scan speed values for porosity assessment in powder bed fusion process design is proposed and verified on both AlSi10Mg alloy and Maraging steel 300.
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