Abstract Abstract Additive manufacturing has emerged as a robust technology for producing components of Additive manufacturing has emerged as a robust technology for producing components of various sizes, featuring intricate geometries. The interplay between geometry and processing various sizes, featuring intricate geometries. The interplay between geometry and processing methods with arc, laser, and electron beam results in dynamic changes in melt pool shapes. methods with arc, laser, and electron beam results in dynamic changes in melt pool shapes. Consequently, these changes lead to variations in thermal gradient (G) and liquid-solid Consequently, these changes lead to variations in thermal gradient (G) and liquid-solid interface velocity (V) during the solidification process. These variations are further interface velocity (V) during the solidification process. These variations are further compounded by repeated heating and cooling cycles, each characterized by distinct heating compounded by repeated heating and cooling cycles, each characterized by distinct heating rates, peak temperatures, and cooling rates. These thermal factors drive the evolution of non-rates, peak temperatures, and cooling rates. These thermal factors drive the evolution of non-equilibrium microstructures, involving complex phase selection phenomena and transitions equilibrium microstructures, involving complex phase selection phenomena and transitions from columnar to equiaxed grain formation due to the instability of the liquid-solid (L/S) from columnar to equiaxed grain formation due to the instability of the liquid-solid (L/S) interface. interface. In this presentation, a review of the foundational solidification theories based on interface response In this presentation, a review of the foundational solidification theories based on interface response functions (IRF) derived from simple binary systems will be presented. Subsequently, an extension of functions (IRF) derived from simple binary systems will be presented. Subsequently, an extension of these concepts to address the highly transient L/S interface motions observed during pulsed arc these concepts to address the highly transient L/S interface motions observed during pulsed arc welding of Fe-C-Al-Mn alloys will be discussed. Given that additive manufacturing essentially welding of Fe-C-Al-Mn alloys will be discussed. Given that additive manufacturing essentially involves welding with complex boundary conditions, one can explore the applicability of IRF models involves welding with complex boundary conditions, one can explore the applicability of IRF models in explaining the fish-scale type structures observed in 316 AM components. Furthermore, the in explaining the fish-scale type structures observed in 316 AM components. Furthermore, the correlation between spatially varying G and V within the melt pool and the phase selection observed correlation between spatially varying G and V within the melt pool and the phase selection observed in Al-Ce-Mn alloys will be examined. In this alloy, the outcomes can range from the formation of the in Al-Ce-Mn alloys will be examined. In this alloy, the outcomes can range from the formation of the fcc phase to intermetallic compounds or eutectic microstructures. Additionally, research on cascading fcc phase to intermetallic compounds or eutectic microstructures. Additionally, research on cascading stability of these solidification microstructures, considering the barriers to nucleate a third phase at the stability of these solidification microstructures, considering the barriers to nucleate a third phase at the interfaces formed during solidification, will be presented. Finally, the relevance of these findings in interfaces formed during solidification, will be presented. Finally, the relevance of these findings in the context of qualifying metal additive manufacturing components, particularly in conjunction with the context of qualifying metal additive manufacturing components, particularly in conjunction with in-situ monitoring techniques, will be outlined. in-situ monitoring techniques, will be outlined. 16Invited Talk NA-1 Invited Talk NA-1 UT/ORNL Governors Chair in Advanced Manufacturing, Department of Mechanical, UT/ORNL Governors Chair in Advanced Manufacturing, Department of Mechanical, Aerospace, Biomedical Engineering, The University of Tennessee, Knoxville, USA Aerospace, Biomedical Engineering, The University of Tennessee, Knoxville, USA Microstructural Heterogeneity in Microstructural Heterogeneity in Dr. Babu obtained his bachelor’s degree in metallurgical engineering from PSG College of Technology, Coimbatore, India, and his master’s degree in industrial welding metallurgy-materials joining from Dr. Babu obtained his bachelor’s degree in metallurgical engineering from PSG College of Technology, Indian Institute of Technology, Madras. He obtained his PhD in materials science and metallurgy from Coimbatore, India, and his master’s degree in industrial welding metallurgy-materials joining from University of Cambridge, UK in 1992. He also worked as a research associate in the Institute for Indian Institute of Technology, Madras. He obtained his PhD in materials science and metallurgy from Materials Research, Sendai, Japan before joining ORNL in 1993. From 1993 to 1997, he held joint University of Cambridge, UK in 1992. He also worked as a research associate in the Institute for researcher position with ORNL, University of Tennessee and The Penn State University. From 1997 Materials Research, Sendai, Japan before joining ORNL in 1993. From 1993 to 1997, he held joint to 2005, he worked as an R&D staff at ORNL. From 2005 to 2007, Suresh held a senior level researcher position with ORNL, University of Tennessee and The Penn State University. From 1997 technology leader position in the area of engineering and materials at Edison Welding Institute, to 2005, he worked as an R&D staff at ORNL. From 2005 to 2007, Suresh held a senior level Columbus, Ohio. From 2007 to 2013, Suresh served as Professor of Materials Science and technology leader position in the area of engineering and materials at Edison Welding Institute, Engineering at The Ohio State University. In 2013, Suresh was appointed as UT/ORNL Governor’s chair of advanced Columbus, Ohio. From 2007 to 2013, Suresh served as Professor of Materials Science and manufacturing at the University of Tennessee, Knoxville, TN. In 2020, Suresh was appointed to the National Science Board Engineering at The Ohio State University. In 2013, Suresh was appointed as UT/ORNL Governor’s chair of advanced by the President of the United States of America for a six-year term. manufacturing at the University of Tennessee, Knoxville, TN. In 2020, Suresh was appointed to the National Science Board by the President of the United States of America for a six-year term. NIMS Award Symposium 2023Sudarsanam Suresh Babu Sudarsanam Suresh Babu NIMS Award SessionMetal Additive Metal Additive ManufacturingManufacturing
元のページ ../index.html#16