Comparison of powder bed fusion and directed energy deposition for tailoring mechanical properties of traditionally brittle alloys

The mechanical performance of an Fe-Co intermetallic alloy processed by laser powder bed fusion (L-PBF) and laser directed energy deposition (L-DED) additive manufacturing is compared. L-PBF material was characterized by high strength (500–550 MPa) and high ductility (35%) in tension, corresponding...

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Bibliographic Details
Published in:Manufacturing letters 2021-04, Vol.28, p.30-34
Main Authors: Babuska, Tomas F., Krick, Brandon A., Susan, Donald F., Kustas, Andrew B.
Format: Article
Language:English
Subjects:
Additive Manufacturing
Advanced Manufacturing
Intermetallic alloys
Laser directed energy deposition
Laser powder bed fusion
MATERIALS SCIENCE
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Summary:The mechanical performance of an Fe-Co intermetallic alloy processed by laser powder bed fusion (L-PBF) and laser directed energy deposition (L-DED) additive manufacturing is compared. L-PBF material was characterized by high strength (500–550 MPa) and high ductility (35%) in tension, corresponding to a ~250% increase in strength and an order-of-magnitude improvement in ductility relative to conventional material. Conversely, L-DED material exhibited similarly poor tensile properties to the conventional wrought alloy, with low strength (200–300 MPa) and low ductility (0–2.7%). The disparity in properties between L-PBF and L-DED material is discussed in the context of the fundamental differences between manufacturing methods.
ISSN:2213-8463
2213-8463
DOI:10.1016/j.mfglet.2021.02.003