Date:
Monday, February 24, 2020
Time:
2:30 p.m. to 5:00 p.m.
Location:
San Diego Convention Center, Room 6A
Sponsored by:
TMS Additive Manufacturing Committee
Organizer:
Ryan Dehoff, Oak Ridge National Laboratory
Eight additive manufacturing-related symposia are planned at the TMS 2020 Annual Meeting & Exhibition. This session of invited presenters ties together these symposia with four perspectives on additive technologies.
Featured Speakers
Tadashi Furuhara, Tohoku University, Japan
Presentation Title: "Roles of Thermal Cycles in the Microstructure and Property Controls in Low-Alloy High Strength Steels"
About the Presentation
Development of additive manufacturing technology has broadened drastically the potentials for improving the properties of metallic materials. However, application of additive manufacturing in steels is still limited in high alloys such as stainless and maraging steels.
During typical additive manufacturing processing, materials experience various rapid heating and cooling cycles, resulting in complex microstructure changes, similarly to multi-pass welding. It is known that application of sophisticated thermal cycles is very important in microstructure and properties in high strength steels. In this presentation, fundamentals of thermal cycles in grain refining, alloy partitioning during phase transformation and refining precipitation dispersion in low-alloy steels are briefly introduced and the importance of thermal history will be emphasized in the application of additive manufacturing to low alloy steels.
About the Presenter
Tadashi Furuhara is a Professor and a Deputy Director of the Institute for Materials Research, Tohoku University, Japan. He obtained Master’s degrees at Kyoto University, Japan, and a Ph.D. at Carnegie Mellon University, USA. After he served as an assistant and associate professor in Kyoto University, he became a professor at Tohoku University in 2005. His main research activity covers a broad area in physical metallurgy of steels and non-ferrous alloys, such as phase transformations/precipitation, deformation/ recrystallization, microstructure control by thermo-mechanical/thermo-chemical processing. He also actively contributes to various academic societies in the metallurgy field. He was a past vice president of the Japan Institute of Metals and Materials and is currently a vice president of the Iron and Steel Institute of Japan. He has been a member of the Phase Transformation Committee and the Steel Committee in TMS, and an editor of Acta and Scripta Materialia.
Simon P. Ringer, The University of Sydney, Australia
Presentation Title: "Microstructural Control for Additive Manufacturing—An Advanced Microscopy Approach"
About the Presentation
Additive Manufacturing (AM) is emerging as a gateway to unexplored metallurgical phenomena that must be understood to open the full potential of the technology in terms of cost, design-flexibility and design-complexity. The steady-state conditions assumed during traditional manufacturing processes are not valid in AM, because of the spatial and temporal transients imposed by the abrupt, cyclical changes in energy delivery. As a result, the intrinsic microstructural heterogeneity throws new challenges at the familiar notion of a ‘microstructure-property’ relationship. This lecture will present recent advances in the way that the electron microscope and the atom probe microscope have enabled insights into this complex relationship. Recent breakthrough methodological advances in Transmission Kikuchi Diffraction, 3D-electron backscattered diffraction, aberration corrected scanning transmission electron microscopy, and atom probe microscopy will be presented in the context of how these techniques are enabling the generation of critical quantitative data for AM process control.
About the Presenter
Simon Ringer works as the University of Sydney's Director of Core Research Facilities, where he provides university-wide leadership of major research infrastructure strategy, planning, and operations. Sydney's Core Research Facilities presently cover biomedical imaging, mass spectrometry, microscopy, informatics, nanofabrication, cytometry, and high-performance analytical capabilities.
Ringer's personal research is in atomic-scale materials design. He uses a materials science and engineering approach to learn how small groups of atoms in special architectures—atomic clusters—can create materials with remarkable properties. Applications include semiconductors, catalyst nanoparticles, and new ultra-strong lightweight alloys. He has lived and worked in Sweden, Japan, the USA, and Australia, holds patents in the design of materials, and has published extensively.
Anthony Rollett, Carnegie Mellon University, USA
Presentation Title: "Texture and Anisotropy in Metals Additive Manufacturing"
About the Presentation
Effectively all alloys currently used for printing are cubic, which means they freeze with <001> biased towards the temperature gradient direction. Moreover, epitaxial growth from the base metal dominates, which sets up a classic growth competition. Naively, one might then expect all prints to exhibit a strong <001> fiber texture parallel to the build direction (BD), given that heat extraction is generally unidirectional through the base plate. The typically strong elastic anisotropy would then result in the BD being more compliant than in the plane. Remembering, however, that prints comprise thousands of welds threading the volume in different directions, the weak textures generally obtained are a consequence of the wide range of local growth directions. Phase transformation, e.g., Ti, further disperses orientation. Exploiting 3D printing to control anisotropy via texture therefore requires subtle methods to control the local growth direction(s), which will be illustrated by experiment and simulation.
About the Presenter
Anthony Rollett's research focuses on microstructural evolution and microstructure-property relationships in 3D. Interests include 3D printing of metals, materials for energy conversion systems, strength of materials, constitutive relations, microstructure, texture, anisotropy, grain growth, recrystallization, formability, extreme value statistics, and stereology. Important recent results include development of a spectral approach to eigenstrain problems, validation of the 3D elasto-viscoplastic FFT code against synchrotron x-ray diffraction data, definition of process windows in 3D printing through characterization of porosity, prediction of solidification microstructure, the appearance of new grains during grain growth, and grain size stabilization. He has been a Professor of Materials Science & Engineering at Carnegie Mellon University (CMU) since 1995 and before that was with the Los Alamos National Laboratory. He is a Fellow of several professional societies. He is the co-Director of CMU’s NextManufacturing Center that is dedicated to advancing manufacturing especially through 3D printing. He has over 200 peer-reviewed publications.
Douglas Hofmann, NASA Jet Propulsion Laboratory/California Institute of Technology, USA
Presentation Title: TMS Young Innovator in the Materials Science of Additive Manufacturing Award: "Innovation in Additive Manufacturing: A Perspective on an Early Career in Metal Alloy Development"
About the Presentation
The past decade has seen rapid and widespread adoption of additive manufacturing (AM) technology at NASA’s Jet Propulsion Laboratory (JPL)/California Institute of Technology. This talk focuses on the establishment of AM capabilities at JPL and subsequent infusion opportunities in spacecraft, with particular emphasis on alloy development, prototyping, testing, and processing and property relationships. AM is an attractive capability for infusion into spacecraft, especially for complex part designs, multifunctional materials, extreme environment materials, hardware with reduced cost and schedule, and low mass structural parts. The JPL now has a large team of scientists, engineers and technologists working in AM with a subset working in alloy development. Some of the AM research topics that will be covered in this talk include functionally graded metals, bulk metallic glasses, metal-matrix composites, self-hammering excavating tools, graded dielectric antennas, and multi-functional materials.
About the Presenter
Douglas Hofmann is a Principal at NASA’s Jet Propulsion Laboratory (JPL). He is also a founding member of the JPL Materials Development and Manufacturing Technology Group and founder of the JPL Metallurgy Facility. He also serves as a Visiting Associate and Lecturer in Materials Science and Applied Physics at the California Institute of Technology (Caltech). He has a B.S. and M.S. in Mechanical Engineering from the University of California San Diego and an M.S. and Ph.D. in Materials Science from Caltech. Hofmann has received many awards for his research, most notably the 2014 Presidential Early Career Award for Scientists and Engineers from President Obama for his work in the development of metallic glass metal matrix composites. He has founded two commercial companies based on his research at JPL.
Additional Additive Manufacturing Technical Programming at TMS2020
TMS2020 will feature the following symposia, held throughout the week, as part of its Additive Technologies technical track:
View the TMS2020 Technical Program web page for more detail on programming plans at the conference.