Fall Seminar Series: John Lewandowski
Seminar: Metal Additive Manufacturing: A Review of Techniques and Mechanical Properties
This presentation summarizes an extensive review* on the techniques and mechanical properties of additively manufactured (AM) metals and includes the work of the author and collaborators. The additive techniques reviewed include Powder Bed Fusion (e.g. EBM, SLM, DLMS) and Directed Energy Deposition (e.g. LENS, EBF3, Laser Hot Wire). Although only a limited number of metallic alloy systems are currently available for AM (e.g. TiAl, Stainless Steel, Inconel 625/718, Al-Si-10Mg), the bulk of the published mechanical properties have been generated on Ti-6Al-4V. Published values for mechanical properties obtained from tension/compression, fracture toughness, fatigue crack growth, and high cycle fatigue will be presented for as-deposited, heat treated, and/or HIPped conditions in order to capture the key observations. The effects of test orientation/build direction on properties, when available, will also be provided along with a discussion of the potential source(s) (e.g. microstructure, defects, etc.) of anisotropy. In addition to examining bulk samples, the use of miniature samples excised from, or printed along with actual parts will be introduced. Recommendations for additional work will also be provided.
*Annual Review of Materials Research (2016) 46, pp.151–186.
John J. Lewandowski is the Arthur P Armington Professor of Engineering II at Case Western Reserve University & Director of the Advanced Manufacturing and Mechanical Reliability Center (AMMRC) http://ammrc.case.edu. He has joint appointments in Materials Science and Engineering, and Mechanical and Aerospace Engineering. BS/ME/PhD were obtained at Carnegie-Mellon University in Metallurgical Engineering and Materials Science where he was a HERTZ Foundation Fellow. He was a NATO Postdoctoral Fellow and subsequently Overseas Fellow at Churchill College, Cambridge University. Publications and presentations exceed 300 and 950, respectively, with a current h-factor > 50. Research and teaching interests include processing/structure/property relationships in advanced materials systems for aerospace, automotive, biomedical, and defense applications. Recent work has focused on additive and other advanced manufacturing techniques.