Date:
Monday, February 28, 2022
Time:
2:00 p.m. to 5:00 p.m.
Location:
Anaheim Convention Center, Room 263A
Sponsored by:
TMS Additive Manufacturing Committee
Organizer:
Allison Beese, Pennsylvania State University
Ten additive manufacturing-related symposia are planned at the TMS 2022 Annual Meeting & Exhibition. This session of invited presenters ties together these symposia with perspectives on additive technologies.
Featured Speakers
Amy Clarke, Colorado School of Mines
Presentation Title: "Metallic Alloy Microstructure Control under Additive Manufacturing Conditions"
About the Presentation
Large temperature gradients, high solidification velocities, and repeated cycles of heating and cooling are typically experienced during additive manufacturing (AM). Combinations of thermal gradient and solid/liquid interface velocity are known to impact microstructure (and defect) development, including potential grain refinement produced by the columnar to equiaxed transition. Thus, a deeper understanding of solidification (and solid state phase transformations, when appropriate) under AM conditions is needed to guide alloy design matched to AM processes. State-of-the-art, multiscale characterization of solidification dynamics and resulting microstructures in the context of the local conditions experienced during AM is needed to achieve this aim. New insights into microstructure development under AM conditions obtained by in-situ/ex-situ characterization of conventional alloys, model alloys, and alloys designed for AM are highlighted. Multiscale in-situ/ex-situ characterization is compared to process modeling and solidification theory and modeling, which will enable the prediction and control of metallic alloy solidification dynamics by advanced manufacturing.
About the Presenter
Amy J. Clarke is a professor, co-director of the Center for Advanced Non-Ferrous Structural Alloys, and a faculty member with the Advanced Steel Processing and Products Research Center in the George S. Ansell Department of Metallurgical and Materials Engineering at the Colorado School of Mines (Mines). Her research focuses on physical metallurgy and making, measuring, and modeling metallic alloys during processing to realize advanced manufacturing. Amy serves on the TMS Foundation Board of Trustees, has served on the TMS and Association for Iron & Steel Technology Boards of Directors, and is an editor for Metallurgical and Materials Transactions A. She is a recipient of the Presidential Early Career Award for Scientists and Engineers, an Office of Naval Research Young Investigator Program, and U.S. Department of Energy Office of Science Early Career Research Program. She is also a TMS Brimacombe Medalist and a Fellow of ASM International.
Michele Manuel, University of Florida
Presentation Title: "Designing High-Temperature Aluminum Intermetallics for Additive Manufacturing"
About the Presentation
Modern materials contain extraordinary levels of complexity, with components spanning a hierarchy of length scales. Designing materials with complex microstructures and demonstrating unique behaviors would be difficult solely using a reductionist approach to materials development. A powerful utility in this endeavor is the use of multiple, correlative, and scaffolding computational tools. This talk focuses on using an integrated materials design approach spanning electronic structure calculations to thermodynamics modeling. Computational techniques are paired with combinatorial experimental methods for validation and exploration to produce a high-temperature aluminum-based, low-cost intermetallic for additive manufacturing.
About the Presenter
Michele Manuel is professor and department chair of the Department of Materials Science and Engineering at the University of Florida. She received her Ph.D. in Materials Science and Engineering at Northwestern University in 2007 and her B.S. in Materials Science and Engineering at the University of Florida. She is an ASM Fellow and the recipient of the Presidential Early Career Award for Scientists and Engineers (PECASE), National Science Foundation CAREER, NASA Early Career Faculty, ASM Bradley Stoughton Award for Young Teachers, AVS Recognition for Excellence in Leadership, TMS Early Career Faculty Fellow, TMS Brimacombe Medalist, and TMS/Japan Institute of Metals and Materials Young Leaders International Scholar awards. Her research focuses on using systems-level design methods to advance the development of new materials through microstructure optimization. Of specific interest are lightweight alloys, self-healing metals, computational thermodynamics and kinetics, shape memory alloys, and materials in extreme environments such as high magnetic fields or under irradiation.
Manyalibo Matthews, Lawrence Livermore National Laboratory
Presentation Title: "Advancing Process Control in Metal Additive Manufacturing"
About the Presentation
Metal powder-bed fusion (PBF) additive manufacturing (AM), while continuing to play an important strategic role across a diverse application space, still lacks the necessary control to obtain parts that meet strict performance-driven criteria for qualification and certification. Here, a new science-based approach is described which can address this shortcoming and fundamentally transform metal PBF AM through development of a modeling and experimental framework. Using this framework new materials and local part properties can be realized, thus enabling more flexible metal-based AM design capabilities compared to those that are currently available today. Prepared by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
About the Presenter
Manyalibo Matthews is the Division Leader for the Materials Science Division within the Physical and Life Sciences Directorate. His expertise includes laser materials processing, laser-matter interaction science, process optimization of advanced manufacturing, and high-speed in situ characterization methods.
Prior to his current role, Matthews served as Group Leader in the Materials Science Division and Program Group Leader for the Laser Material Interaction Group in the National Ignition Facility and Photon Science organization.
Before joining the laboratory, Matthews was a member of the Technical Staff at Bell Laboratories, focusing on optical microspectroscopy and managing projects aimed at developing Passive Optical Network prototypes.
Matthews is currently a co-organizer for the Materials Research Society and Materials Science and Technology symposiums, a member of the Academic Advisory Board at Norfolk State University, and a Fellow of the Optical Society of America.
Tao Sun, University of Virginia
Presentation Title: TMS Young Innovator in the Materials Science of Additive Manufacturing Award: “The Critical Roles of Keyhole in Laser Powder Bed Fusion”
About the Presentation
Laser powder bed fusion (LPBF) is the most extensively used metal additive manufacturing technology, owing to its unique capabilities for building parts with high geometry complexity and fine features. In a LPBF process, sparks (i.e. spattered particles) can be observed to follow the laser scanning path, indicating the existence of high-velocity vapor arising from the melt pool. Indeed, strong metal vaporization occurs in LBPF, and the resulting recoil pressure can create a deep vapor depression in the melt pool, which is often referred to as keyhole. Keyhole is a critical dynamic structure feature in LPBF. Here, I will present the direct observation of keyhole dynamics using high-speed high-resolution synchrotron x-ray imaging. Based on the morphology and fluctuation mode, keyholes can be categorized as stable and unstable types. Their effects on the effective laser absorption, melt pool morphology development, and generation of various structure defects will be elucidated.
About the Presenter
Tao Sun is an associate professor of materials science and engineering (MSE) at the University of Virginia (UVA). Sun received his B.S. and M.S. in MSE from Tsinghua University, and Ph.D. in MSE from Northwestern University. After his postdoc research at the Advanced Photon Source of Argonne National Laboratory, Sun joined the imaging group as a beamline scientist in 2012 and started to develop and apply high-speed x-ray techniques for studying highly dynamic irreversible and non-repeatable material processes. In 2019, Sun returned to academia and became a faculty member at UVA. Sun has extensive research experience on material structure characterization and metal additive manufacturing (AM). During his Argonne period, Sun pioneered the application of high-speed synchrotron x-ray techniques for operando studies of various metal AM processes. The ability of directly observing and quantifying material dynamics during AM processes helps address many critical issues associated with defect generation, high-fidelity numerical models, and real-time process monitoring. Sun’s UVA team is interested in understanding the physics underlying the energy-matter interactions involved in AM processes, and in developing advanced metallic and composite systems via and for AM.
Additional Additive Manufacturing Technical Programming at TMS2022
TMS2022 will feature the following symposia, held throughout the week, as part of its Additive Technologies technical track:
View the TMS2022 Technical Program web page for more detail on programming plans at the conference.