MMAE Seminar - Dr. Chantal K. Sudbrack - Impact of Powder Variability on the Microstructure and Mechanical Behavior of Additively Manufactured Nickel Alloy 718

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John T. Rettaliata Engineering Center, Room 102, 10 West 32nd Street, Chicago, IL 60616
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  3. MMAE Seminar - Dr. Chantal K. Sudbrack - Impact of Powder Variability on the Microstructure and Mechanical Behavior of Additively Manufactured Nickel Alloy 718

Armour College of Engineering's Mechanical, Materials, and Aerospace Engineering Department will welcome Dr. Chantal K. Sudbrack on Friday, July 12th, to present her lecture, Impact of Powder Variability on the Microstructure and Mechanical Behavior of Additively Manufactured Nickel Alloy 718.

Abstract

Nickel Alloy 718 has found wide use in high-temperature aerospace applications (up to 700°C), due to a combination of good mechanical properties, environmental resistance, and workability at moderate cost. These properties have led Alloy 718 to early adoption by selective laser melting (SLM) additive manufacturing. This presentation will review an optimization of heat treatment steps for SLM Alloy 718 using CALPHAD microstructural predictions, and then share results from a comprehensive industry survey of 718 powder feedstock for SLM. The survey focuses on the impact of variability in powder characteristics on build quality, microstructure, tensile and high cycle fatigue in the as-fabricated and machined surface conditions. The investigation includes sixteen powder lots from eight suppliers that are produced by gas atomization or rotary atomization in argon or nitrogen. This powder survey research was previously presented and published at the 9th International Symposium on Superalloy 718 & Derivatives and was funded by NASA Space Launch System Liquid Engine Office with the Human Exploration Operations Mission Directorate.

Biography

Dr. Chantal Sudbrack is a physical metallurgist with expertise in alloy development strategies, environmental damage, processing relationships and microstructural predictions for structural alloys that are conventionally or additively manufactured. After post-doctoral research at Argonne National Laboratory, Dr. Sudbrack spent eight years as a materials research engineer at NASA Glenn Research Center in Cleveland, Ohio, concentrating on nickel-based superalloys used in turbomachinery for aerospace applications. She has been active in area of additive manufacturing since 2013 with NASA, and more recently with QuesTek Innovations in Evanston, Illinois, where she focused advancing steel additive manufacturing. She earned her PhD in Materials Science and Engineering from Northwestern. Her doctoral work with Professor David Seidman established with atom probe tomography mechanisms for early stages of nucleation, growth and coarsening in the solid slate and was published in a series of papers in Nature Materials, Physical Review B, and Acta Materialia.

She has over 1000 citations and has published more than 40 peer-reviewed journal articles, conference proceedings and NASA technical reports, and has given more than 22 invited talks with 13 focusing on additive manufacturing research. Her honors and awards include: Northwestern University MS&E Alumni Early Career Achievement, TMS Young Professional Leader Award, Microscopy Society of America Presidential Student Award, NSF Graduate Student Fellowship, and Columbia University Francis Rhode Prize for Undergraduate Research.